Date   

Re: Canard Aerodynamics Presentation

Mike Tooze
 

Although I’ve only seen that first part of his presentation Marc is to be congratulated on trying to enlighten the pros and cons of the canard configuration to a wider audience. After all, the Wight brother’s experimentation, genius and understanding of the canard was not recognised in their county for some years.
However, perhaps, to clarify an old chestnut.

The high aspect ration conundrum.
‘Increasing the span to infinity reduces the drag to zero’, will send any mathematician with a passing knowledge of hydrodynamics looking for walls to climb.
As Marc’s spotted streamline graphic shows that any practical aerofoil produces ‘lift per unit span’ normal to the flow and ‘drag per unit span’ parallel to the direction of flow. Thus increasing the span to infinity produces infinite lift and infinite drag, far from zero.
What is not stated is a constraint, an arbitrary extra restriction, that total lift be equal to the weight of the aircraft (glider).
Thus now as we increase span to infinity the lift and drag per unit span both tend to zero.

But that still doesn’t prove anything.

If we look at the behaviour of lift and drag against increasing alpha we see that for a practical aerofoil that drag increases steeper than lift.
Conversely with reducing alpha, drag reduces faster than lift. Thus by increasing span so reducing required lift per unit span so drag is proportionately reduced further. Thus increasing span to some other limit, say, structural, so total drag is reduced under the constraint that lift equals aircraft weight.

Lutom asks a good point re area rue and I suppose lateral acceleration of flow and the Cozy fuselage, I will look forward to seeing that section of Marc’s presentation.

My 2d,

Sincerely,

Mike Tooze
O-235 Vari Eze



------ Original Message ------
From: "Lutorm" <patrik-pilot@...>
To: canard-aviators@canardzone.groups.io
Sent: Thursday, 4 Mar, 21 At 05:19
Subject: Re: [c-a] Canard Aerodynamics Presentation

I had a question, actually:

The Raptor website made a claim that the drag will be lower if the cross sectional area has an as smooth a profile as possible and because a canard tends to not have the canopy and the wings occupy cross sectional area at the same fuselage station they have a smoother distribution compared to a conventional aircraft where the canopy and the wings tend to bulge out at the same time. It's gone from their website but I grabbed these pictures from archive.org:

As far as I can find, the "Whitcomb area rule" which says you get more drag when the cross-sectional area changes, is only relevant for wave drag at transonic speeds. Do you have any idea whether this would actually matter for the speeds we fly at?


Re: Canard Aerodynamics Presentation

Marc J. Zeitlin
 

Lutorm wrote:

The Raptor website...

Oh, boy. Let me preface this by stating that I performed an examination of the Raptor aircraft, 15 months ago, prior to Wasabi Racing attempting to fly the plane, when Peter thought it was ready to fly in December of 2019, in an attempt to keep Justin and Elliot alive. That said, on to the questions...

As far as I can find, the "Whitcomb area rule" which says you get more drag when the cross-sectional area changes, is only relevant for wave drag at transonic speeds.

That is correct. Area ruling only matters at transonic speeds. There is no such thing as subsonic area ruling. There are drag reduction efforts at intersections that can reduce drag - this is why the winglets on our planes are set back 4" from the LE of the wing - so that the thickest portion of the wing and winglet don't occur in the same FS, but that's not the same as area ruling, which is a more global phenomenon and has nothing to do with intersections, per se.
 
Do you have any idea whether this would actually matter for the speeds we fly at?

Yes, I do. And the answer is absolutely not. There is not one aerodynamicist to whom I've spoken who hasn't pointed out exactly the same thing. Peter does not understand aerodynamics, or pretty much anything else about what makes airplanes or engines work. He's a very nice guy, but is in way over his head and I'm only glad that the engine failure (predicted by many) happened very close to the airport.

The plane will never have anything close to the performance that was predicted using incorrect methodology and understanding.

--
Marc J. Zeitlin                      marc_zeitlin@...
                                            http://www.cozybuilders.org/
Copyright © 2021                     Burnside Aerospace


Re: Canard Aerodynamics Presentation

Lutorm
 

I had a question, actually:

The Raptor website made a claim that the drag will be lower if the cross sectional area has an as smooth a profile as possible and because a canard tends to not have the canopy and the wings occupy cross sectional area at the same fuselage station they have a smoother distribution compared to a conventional aircraft where the canopy and the wings tend to bulge out at the same time. It's gone from their website but I grabbed these pictures from archive.org:

As far as I can find, the "Whitcomb area rule" which says you get more drag when the cross-sectional area changes, is only relevant for wave drag at transonic speeds. Do you have any idea whether this would actually matter for the speeds we fly at?


Re: Canard Aircraft Aerodynamic

Tom Stichman
 

Thank you. It’s a great presentation and I’ll watch the rest tomorrow. 
Thx
Tom Stichman


On Mar 3, 2021, at 21:48, Marc J. Zeitlin <marc.j.zeitlin@...> wrote:


Folks:

A couple of folks have let me know that:

Only 15 minutes is on your presentation. I have Dropbox but I’m unable to download any more. Is there more and how do you download it. It’s a great presentation so far.

One solution was to download the whole file to their computer - then you'd be able to see the whole thing.

But, to solve this stupid problem, I've uploaded the presentation to youtube at:


Kind of a rough edit at the beginning and end, but hey - I'm no videographer. I've removed the Dropbox version, so this is it for now - no downloading required.

--
Marc J. Zeitlin                      marc_zeitlin@...
                                            http://www.cozybuilders.org/
Copyright © 2021                     Burnside Aerospace


Re: LoVac troubles

Lutorm
 

Thanks for the responses everyone.

The pressure was 30kPa (-70kPa vacuum), which is what the pump is capable of. I'm pretty sure it's not drawing air into the layup, any leaks would mostly be where the hose enters or the plastic is folded. Even if there was another leak it should draw air into the paper towels first, but they were uniformly soaked. The paper towels were saturated with resin, and I definitely made sure the cloth and peel pry were wet. I used Pro-set 125 with 226 medium hardener.


Re: Canard Aircraft Aerodynamic

Marc J. Zeitlin
 

Folks:

A couple of folks have let me know that:

Only 15 minutes is on your presentation. I have Dropbox but I’m unable to download any more. Is there more and how do you download it. It’s a great presentation so far.

One solution was to download the whole file to their computer - then you'd be able to see the whole thing.

But, to solve this stupid problem, I've uploaded the presentation to youtube at:


Kind of a rough edit at the beginning and end, but hey - I'm no videographer. I've removed the Dropbox version, so this is it for now - no downloading required.

--
Marc J. Zeitlin                      marc_zeitlin@...
                                            http://www.cozybuilders.org/
Copyright © 2021                     Burnside Aerospace


Re: This Thursday's Builders Project Corner

stephen wolpin
 

I see. Let me know if it's possible.  The GRT session will be a good one in any case—I'm on another Zoom call at exactly that same time...

Steve


On 3/3/2021 10:39 AM, nosedragger48154 wrote:
Hi Steve, you’re correct, however I am the low man on the totem pole.  People on our Board make those decisions.  Then where do you store the data.  I am not privy to any of that.  Sorry. 

Mike Scovel

On Mar 3, 2021, at 1:04 PM, stephen wolpin <swolpin@...> wrote:

 Zoom makes it easy to record. Understood about capacity.  Good to have a record of meetings for yourselves too.  
Thanks,

   Steve Wolpin 
       From iPhone



On Mar 3, 2021, at 9:56 AM, nosedragger48154 <ezdriver@...> wrote:



Hi Steve, I will try, but I cannot make any promises.  I know little if anything of our storage capacity for our meetings.  I will check and find out.

 

Sincerely,

 

Mike Scovel

SE Michigan

VariEze

 

Mbl     (313) 608-7202

Email   ezdriver@...

 

 

 

From: canard-aviators@canardzone.groups.io <canard-aviators@canardzone.groups.io> On Behalf Of stephen wolpin
Sent: Wednesday, March 3, 2021 11:42 AM
To: canard-aviators@canardzone.groups.io
Subject: Re: [c-a] This Thursday's Builders Project Corner

 

Mike, Please have this Zoom session recorded (by whomever set up the meeting) and make the recording link available after.  Thanks.

   Steve Wolpin 

KSZP LEZ N50MH

       From iPhone

 

 



On Mar 3, 2021, at 6:13 AM, nosedragger48154 <ezdriver@...> wrote:



Hi Gang, we have been graced to have Greg Toman from Grand Rapids Technology presenting on our Builders Project Corner again!  However this time it will be a Zoom Meeting this Thursday March 4th at 7:30 PM.  See the attachment for more details, in addition if you have any questions this would be the best opportunity to get the answers!  See below for the link to the meeting.  I want to make sure everyone understands that it is Eastern Time!  Looking forward to seeing everyone there!

 

Topic: EAA 113 Homebuilder's Meeting 2021
Time: Jan 7, 2021 07:30 PM Eastern Time (US and Canada)
        Every month on the First Thu, until Dec 2, 2021, 12 occurrence(s)
        Jan 7, 2021 07:30 PM
        Feb 4, 2021 07:30 PM
        Mar 4, 2021 07:30 PM
        Apr 1, 2021 07:30 PM
        May 6, 2021 07:30 PM
        Jun 3, 2021 07:30 PM
        Jul 1, 2021 07:30 PM
        Aug 5, 2021 07:30 PM
        Sep 2, 2021 07:30 PM
        Oct 7, 2021 07:30 PM
        Nov 4, 2021 07:30 PM
        Dec 2, 2021 07:30 PM
Please download and import the following iCalendar (.ics) files to your calendar system.
Monthly: https://zoom.us/meeting/tJMpdO2sqDovEtJD9L1dC9iUdB7EovCn9zx-/ics?icsToken=98tyKuCvqjguHtKUtRGBRowEBojCLOjwpn5Yj7d3uEbJUiRwOwrDMsAVF71pM9aJ

Join Zoom Meeting
https://zoom.us/j/97434461586?pwd=QmlWeU41M2c2b29abForV09INEFnUT09

Meeting ID: 974 3446 1586
Passcode: 751257
One tap mobile
+12532158782,,97434461586#,,,,*751257# US (Tacoma)
+13462487799,,97434461586#,,,,*751257# US (Houston)

Dial by your location
        +1 253 215 8782 US (Tacoma)
        +1 346 248 7799 US (Houston)
        +1 669 900 6833 US (San Jose)
        +1 301 715 8592 US (Washington D.C)
        +1 312 626 6799 US (Chicago)
        +1 929 205 6099 US (New York)
Meeting ID: 974 3446 1586
Passcode: 751257
Find your local number: https://zoom.us/u/apGL5gW4Z

Sincerely,

 

Mike Scovel

SE Michigan

VariEze

 

Mbl     (313) 608-7202

Email   ezdriver@...

 

<March 4th Builders Project Corner.docx>


Re: This Thursday's Builders Project Corner

nosedragger48154
 

Hi Steve, you’re correct, however I am the low man on the totem pole.  People on our Board make those decisions.  Then where do you store the data.  I am not privy to any of that.  Sorry. 

Mike Scovel

On Mar 3, 2021, at 1:04 PM, stephen wolpin <swolpin@...> wrote:

Zoom makes it easy to record. Understood about capacity.  Good to have a record of meetings for yourselves too.  
Thanks,

   Steve Wolpin 
       From iPhone



On Mar 3, 2021, at 9:56 AM, nosedragger48154 <ezdriver@...> wrote:



Hi Steve, I will try, but I cannot make any promises.  I know little if anything of our storage capacity for our meetings.  I will check and find out.

 

Sincerely,

 

Mike Scovel

SE Michigan

VariEze

 

Mbl     (313) 608-7202

Email   ezdriver@...

 

 

 

From: canard-aviators@canardzone.groups.io <canard-aviators@canardzone.groups.io> On Behalf Of stephen wolpin
Sent: Wednesday, March 3, 2021 11:42 AM
To: canard-aviators@canardzone.groups.io
Subject: Re: [c-a] This Thursday's Builders Project Corner

 

Mike, Please have this Zoom session recorded (by whomever set up the meeting) and make the recording link available after.  Thanks.

   Steve Wolpin 

KSZP LEZ N50MH

       From iPhone

 

 



On Mar 3, 2021, at 6:13 AM, nosedragger48154 <ezdriver@...> wrote:



Hi Gang, we have been graced to have Greg Toman from Grand Rapids Technology presenting on our Builders Project Corner again!  However this time it will be a Zoom Meeting this Thursday March 4th at 7:30 PM.  See the attachment for more details, in addition if you have any questions this would be the best opportunity to get the answers!  See below for the link to the meeting.  I want to make sure everyone understands that it is Eastern Time!  Looking forward to seeing everyone there!

 

Topic: EAA 113 Homebuilder's Meeting 2021
Time: Jan 7, 2021 07:30 PM Eastern Time (US and Canada)
        Every month on the First Thu, until Dec 2, 2021, 12 occurrence(s)
        Jan 7, 2021 07:30 PM
        Feb 4, 2021 07:30 PM
        Mar 4, 2021 07:30 PM
        Apr 1, 2021 07:30 PM
        May 6, 2021 07:30 PM
        Jun 3, 2021 07:30 PM
        Jul 1, 2021 07:30 PM
        Aug 5, 2021 07:30 PM
        Sep 2, 2021 07:30 PM
        Oct 7, 2021 07:30 PM
        Nov 4, 2021 07:30 PM
        Dec 2, 2021 07:30 PM
Please download and import the following iCalendar (.ics) files to your calendar system.
Monthly: https://zoom.us/meeting/tJMpdO2sqDovEtJD9L1dC9iUdB7EovCn9zx-/ics?icsToken=98tyKuCvqjguHtKUtRGBRowEBojCLOjwpn5Yj7d3uEbJUiRwOwrDMsAVF71pM9aJ

Join Zoom Meeting
https://zoom.us/j/97434461586?pwd=QmlWeU41M2c2b29abForV09INEFnUT09

Meeting ID: 974 3446 1586
Passcode: 751257
One tap mobile
+12532158782,,97434461586#,,,,*751257# US (Tacoma)
+13462487799,,97434461586#,,,,*751257# US (Houston)

Dial by your location
        +1 253 215 8782 US (Tacoma)
        +1 346 248 7799 US (Houston)
        +1 669 900 6833 US (San Jose)
        +1 301 715 8592 US (Washington D.C)
        +1 312 626 6799 US (Chicago)
        +1 929 205 6099 US (New York)
Meeting ID: 974 3446 1586
Passcode: 751257
Find your local number: https://zoom.us/u/apGL5gW4Z

Sincerely,

 

Mike Scovel

SE Michigan

VariEze

 

Mbl     (313) 608-7202

Email   ezdriver@...

 

<March 4th Builders Project Corner.docx>


Re: This Thursday's Builders Project Corner

stephen wolpin
 

Zoom makes it easy to record. Understood about capacity.  Good to have a record of meetings for yourselves too.  
Thanks,

   Steve Wolpin 
       From iPhone



On Mar 3, 2021, at 9:56 AM, nosedragger48154 <ezdriver@...> wrote:



Hi Steve, I will try, but I cannot make any promises.  I know little if anything of our storage capacity for our meetings.  I will check and find out.

 

Sincerely,

 

Mike Scovel

SE Michigan

VariEze

 

Mbl     (313) 608-7202

Email   ezdriver@...

 

 

 

From: canard-aviators@canardzone.groups.io <canard-aviators@canardzone.groups.io> On Behalf Of stephen wolpin
Sent: Wednesday, March 3, 2021 11:42 AM
To: canard-aviators@canardzone.groups.io
Subject: Re: [c-a] This Thursday's Builders Project Corner

 

Mike, Please have this Zoom session recorded (by whomever set up the meeting) and make the recording link available after.  Thanks.

   Steve Wolpin 

KSZP LEZ N50MH

       From iPhone

 

 



On Mar 3, 2021, at 6:13 AM, nosedragger48154 <ezdriver@...> wrote:



Hi Gang, we have been graced to have Greg Toman from Grand Rapids Technology presenting on our Builders Project Corner again!  However this time it will be a Zoom Meeting this Thursday March 4th at 7:30 PM.  See the attachment for more details, in addition if you have any questions this would be the best opportunity to get the answers!  See below for the link to the meeting.  I want to make sure everyone understands that it is Eastern Time!  Looking forward to seeing everyone there!

 

Topic: EAA 113 Homebuilder's Meeting 2021
Time: Jan 7, 2021 07:30 PM Eastern Time (US and Canada)
        Every month on the First Thu, until Dec 2, 2021, 12 occurrence(s)
        Jan 7, 2021 07:30 PM
        Feb 4, 2021 07:30 PM
        Mar 4, 2021 07:30 PM
        Apr 1, 2021 07:30 PM
        May 6, 2021 07:30 PM
        Jun 3, 2021 07:30 PM
        Jul 1, 2021 07:30 PM
        Aug 5, 2021 07:30 PM
        Sep 2, 2021 07:30 PM
        Oct 7, 2021 07:30 PM
        Nov 4, 2021 07:30 PM
        Dec 2, 2021 07:30 PM
Please download and import the following iCalendar (.ics) files to your calendar system.
Monthly: https://zoom.us/meeting/tJMpdO2sqDovEtJD9L1dC9iUdB7EovCn9zx-/ics?icsToken=98tyKuCvqjguHtKUtRGBRowEBojCLOjwpn5Yj7d3uEbJUiRwOwrDMsAVF71pM9aJ

Join Zoom Meeting
https://zoom.us/j/97434461586?pwd=QmlWeU41M2c2b29abForV09INEFnUT09

Meeting ID: 974 3446 1586
Passcode: 751257
One tap mobile
+12532158782,,97434461586#,,,,*751257# US (Tacoma)
+13462487799,,97434461586#,,,,*751257# US (Houston)

Dial by your location
        +1 253 215 8782 US (Tacoma)
        +1 346 248 7799 US (Houston)
        +1 669 900 6833 US (San Jose)
        +1 301 715 8592 US (Washington D.C)
        +1 312 626 6799 US (Chicago)
        +1 929 205 6099 US (New York)
Meeting ID: 974 3446 1586
Passcode: 751257
Find your local number: https://zoom.us/u/apGL5gW4Z

Sincerely,

 

Mike Scovel

SE Michigan

VariEze

 

Mbl     (313) 608-7202

Email   ezdriver@...

 

<March 4th Builders Project Corner.docx>


Re: This Thursday's Builders Project Corner

nosedragger48154
 

Hi Steve, I will try, but I cannot make any promises.  I know little if anything of our storage capacity for our meetings.  I will check and find out.

 

Sincerely,

 

Mike Scovel

SE Michigan

VariEze

 

Mbl     (313) 608-7202

Email   ezdriver@...

 

 

 

From: canard-aviators@canardzone.groups.io <canard-aviators@canardzone.groups.io> On Behalf Of stephen wolpin
Sent: Wednesday, March 3, 2021 11:42 AM
To: canard-aviators@canardzone.groups.io
Subject: Re: [c-a] This Thursday's Builders Project Corner

 

Mike, Please have this Zoom session recorded (by whomever set up the meeting) and make the recording link available after.  Thanks.

   Steve Wolpin 

KSZP LEZ N50MH

       From iPhone

 

 



On Mar 3, 2021, at 6:13 AM, nosedragger48154 <ezdriver@...> wrote:



Hi Gang, we have been graced to have Greg Toman from Grand Rapids Technology presenting on our Builders Project Corner again!  However this time it will be a Zoom Meeting this Thursday March 4th at 7:30 PM.  See the attachment for more details, in addition if you have any questions this would be the best opportunity to get the answers!  See below for the link to the meeting.  I want to make sure everyone understands that it is Eastern Time!  Looking forward to seeing everyone there!

 

Topic: EAA 113 Homebuilder's Meeting 2021
Time: Jan 7, 2021 07:30 PM Eastern Time (US and Canada)
        Every month on the First Thu, until Dec 2, 2021, 12 occurrence(s)
        Jan 7, 2021 07:30 PM
        Feb 4, 2021 07:30 PM
        Mar 4, 2021 07:30 PM
        Apr 1, 2021 07:30 PM
        May 6, 2021 07:30 PM
        Jun 3, 2021 07:30 PM
        Jul 1, 2021 07:30 PM
        Aug 5, 2021 07:30 PM
        Sep 2, 2021 07:30 PM
        Oct 7, 2021 07:30 PM
        Nov 4, 2021 07:30 PM
        Dec 2, 2021 07:30 PM
Please download and import the following iCalendar (.ics) files to your calendar system.
Monthly: https://zoom.us/meeting/tJMpdO2sqDovEtJD9L1dC9iUdB7EovCn9zx-/ics?icsToken=98tyKuCvqjguHtKUtRGBRowEBojCLOjwpn5Yj7d3uEbJUiRwOwrDMsAVF71pM9aJ

Join Zoom Meeting
https://zoom.us/j/97434461586?pwd=QmlWeU41M2c2b29abForV09INEFnUT09

Meeting ID: 974 3446 1586
Passcode: 751257
One tap mobile
+12532158782,,97434461586#,,,,*751257# US (Tacoma)
+13462487799,,97434461586#,,,,*751257# US (Houston)

Dial by your location
        +1 253 215 8782 US (Tacoma)
        +1 346 248 7799 US (Houston)
        +1 669 900 6833 US (San Jose)
        +1 301 715 8592 US (Washington D.C)
        +1 312 626 6799 US (Chicago)
        +1 929 205 6099 US (New York)
Meeting ID: 974 3446 1586
Passcode: 751257
Find your local number: https://zoom.us/u/apGL5gW4Z

Sincerely,

 

Mike Scovel

SE Michigan

VariEze

 

Mbl     (313) 608-7202

Email   ezdriver@...

 

<March 4th Builders Project Corner.docx>


Re: This Thursday's Builders Project Corner

stephen wolpin
 

Mike, Please have this Zoom session recorded (by whomever set up the meeting) and make the recording link available after.  Thanks.

   Steve Wolpin 
KSZP LEZ N50MH
       From iPhone



On Mar 3, 2021, at 6:13 AM, nosedragger48154 <ezdriver@...> wrote:



Hi Gang, we have been graced to have Greg Toman from Grand Rapids Technology presenting on our Builders Project Corner again!  However this time it will be a Zoom Meeting this Thursday March 4th at 7:30 PM.  See the attachment for more details, in addition if you have any questions this would be the best opportunity to get the answers!  See below for the link to the meeting.  I want to make sure everyone understands that it is Eastern Time!  Looking forward to seeing everyone there!

 

Topic: EAA 113 Homebuilder's Meeting 2021
Time: Jan 7, 2021 07:30 PM Eastern Time (US and Canada)
        Every month on the First Thu, until Dec 2, 2021, 12 occurrence(s)
        Jan 7, 2021 07:30 PM
        Feb 4, 2021 07:30 PM
        Mar 4, 2021 07:30 PM
        Apr 1, 2021 07:30 PM
        May 6, 2021 07:30 PM
        Jun 3, 2021 07:30 PM
        Jul 1, 2021 07:30 PM
        Aug 5, 2021 07:30 PM
        Sep 2, 2021 07:30 PM
        Oct 7, 2021 07:30 PM
        Nov 4, 2021 07:30 PM
        Dec 2, 2021 07:30 PM
Please download and import the following iCalendar (.ics) files to your calendar system.
Monthly: https://zoom.us/meeting/tJMpdO2sqDovEtJD9L1dC9iUdB7EovCn9zx-/ics?icsToken=98tyKuCvqjguHtKUtRGBRowEBojCLOjwpn5Yj7d3uEbJUiRwOwrDMsAVF71pM9aJ

Join Zoom Meeting
https://zoom.us/j/97434461586?pwd=QmlWeU41M2c2b29abForV09INEFnUT09

Meeting ID: 974 3446 1586
Passcode: 751257
One tap mobile
+12532158782,,97434461586#,,,,*751257# US (Tacoma)
+13462487799,,97434461586#,,,,*751257# US (Houston)

Dial by your location
        +1 253 215 8782 US (Tacoma)
        +1 346 248 7799 US (Houston)
        +1 669 900 6833 US (San Jose)
        +1 301 715 8592 US (Washington D.C)
        +1 312 626 6799 US (Chicago)
        +1 929 205 6099 US (New York)
Meeting ID: 974 3446 1586
Passcode: 751257
Find your local number: https://zoom.us/u/apGL5gW4Z

Sincerely,

 

Mike Scovel

SE Michigan

VariEze

 

Mbl     (313) 608-7202

Email   ezdriver@...

 

<March 4th Builders Project Corner.docx>


This Thursday's Builders Project Corner

nosedragger48154
 

Hi Gang, we have been graced to have Greg Toman from Grand Rapids Technology presenting on our Builders Project Corner again!  However this time it will be a Zoom Meeting this Thursday March 4th at 7:30 PM.  See the attachment for more details, in addition if you have any questions this would be the best opportunity to get the answers!  See below for the link to the meeting.  I want to make sure everyone understands that it is Eastern Time!  Looking forward to seeing everyone there!

 

Topic: EAA 113 Homebuilder's Meeting 2021
Time: Jan 7, 2021 07:30 PM Eastern Time (US and Canada)
        Every month on the First Thu, until Dec 2, 2021, 12 occurrence(s)
        Jan 7, 2021 07:30 PM
        Feb 4, 2021 07:30 PM
        Mar 4, 2021 07:30 PM
        Apr 1, 2021 07:30 PM
        May 6, 2021 07:30 PM
        Jun 3, 2021 07:30 PM
        Jul 1, 2021 07:30 PM
        Aug 5, 2021 07:30 PM
        Sep 2, 2021 07:30 PM
        Oct 7, 2021 07:30 PM
        Nov 4, 2021 07:30 PM
        Dec 2, 2021 07:30 PM
Please download and import the following iCalendar (.ics) files to your calendar system.
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Sincerely,

 

Mike Scovel

SE Michigan

VariEze

 

Mbl     (313) 608-7202

Email   ezdriver@...

 


Re: Canard Aerodynamics Presentation

Bill Allen
 

Thanks for sharing Marc. Most interesting presentation.

Bill

On Wed, 3 Mar 2021 at 04:32, Marc J. Zeitlin <marc.j.zeitlin@...> wrote:
Folks:

I was asked by EAA chapter 376 in Fresno, CA to give a presentation to their membership (I'm listed on the EAA Speaker Bureau website), and the presentation they chose was on "Canard Aircraft Aerodynamics - What's the Difference?".

It was via Zoom, and they recorded it, so I've trimmed (roughly) the useless beginning and ends of the video and have made it available here as a 220 MB MP4 file (maybe eventually I'll put it on the "Presentations" page on the COZYBUILDERS site):


The person recording it only had one screen, so the upper right corner of the screen is somewhat covered by some of the attendees faces (not everyone is a zoom expert...). But, luckily, you can view the original presentation given at the Columbia Fly-In in 2019 here:


and follow along with the audio from the zoom recording. The slides aren't changed except for the footers and title page.

Many of you will be unhappy with what you hear about canard aircraft, in which case I will consider my job as being complete :-).

They seemed happy with the presentation, but all feedback, discussion and virtual rotten tomatoes are welcome.

--
Marc J. Zeitlin                      marc_zeitlin@...
                                            http://www.cozybuilders.org/
Copyright © 2021                     Burnside Aerospace

--


Re: Canard Aerodynamics Presentation

Rick Hall
 

Thanks, will take a peek and see if can be whittled down to 45 minutes. If we use it, will letcha know as some may want autographs.

Kevin knows you though, hangars a Pacer at TSP, works for Stratolaunch. Started with Scaled, then when Scaled split off Stratolaunch (or whatever), he stayed with the big airplane. His dad and I are pals at LMO.

On 3/2/2021 11:08 PM, Marc J. Zeitlin wrote:
Rick Hall wrote:
About how many minutes?
About 90 minutes, I think. There were a fair number of questions.
Any thoughts on having Kevin Bickers speak at our Chapter?
Not a clue who that is...
--
Marc J. Zeitlin <http://www.mdzeitlin.com/Marc/> marc_zeitlin@alum.mit.edu <mailto:marc_zeitlin@alum.mit.edu>
http://www.cozybuilders.org/ <http://www.cozybuilders.org/>
Copyright © 2021 Burnside Aerospace <http://www.burnsideaerospace.com/>
_._,_._,_


Re: Canard Aerodynamics Presentation

Marc J. Zeitlin
 

Rick Hall wrote:

About how many minutes?

About 90 minutes, I think. There were a fair number of questions.
 
Any thoughts on having Kevin Bickers speak at our Chapter?

Not a clue who that is... 

--
Marc J. Zeitlin                      marc_zeitlin@...
                                            http://www.cozybuilders.org/
Copyright © 2021                     Burnside Aerospace


Re: Canard Aerodynamics Presentation

Rick Hall
 

About how many minutes?

Our Chapter has had James Voss talk, Jim Price is scheduled, may as well add another engineer to the mix.

Any thoughts on having Kevin Bickers speak at our Chapter?

Rick

On 3/2/2021 8:32 PM, Marc J. Zeitlin wrote:
Folks:
I was asked by EAA chapter 376 in Fresno, CA to give a presentation to their membership (I'm listed on the EAA Speaker Bureau website), and the presentation they chose was on "Canard Aircraft Aerodynamics - What's the Difference?".
It was via Zoom, and they recorded it, so I've trimmed (roughly) the useless beginning and ends of the video and have made it available here as a 220 MB MP4 file (maybe eventually I'll put it on the "Presentations" page on the COZYBUILDERS site):
https://www.dropbox.com/sh/34biqvx2hdjbunx/AABUJayQo6K_-BvJcQicspB7a?dl=0
<https://www.dropbox.com/sh/34biqvx2hdjbunx/AABUJayQo6K_-BvJcQicspB7a?dl=0>


Canard Aerodynamics Presentation

Marc J. Zeitlin
 

Folks:

I was asked by EAA chapter 376 in Fresno, CA to give a presentation to their membership (I'm listed on the EAA Speaker Bureau website), and the presentation they chose was on "Canard Aircraft Aerodynamics - What's the Difference?".

It was via Zoom, and they recorded it, so I've trimmed (roughly) the useless beginning and ends of the video and have made it available here as a 220 MB MP4 file (maybe eventually I'll put it on the "Presentations" page on the COZYBUILDERS site):


The person recording it only had one screen, so the upper right corner of the screen is somewhat covered by some of the attendees faces (not everyone is a zoom expert...). But, luckily, you can view the original presentation given at the Columbia Fly-In in 2019 here:


and follow along with the audio from the zoom recording. The slides aren't changed except for the footers and title page.

Many of you will be unhappy with what you hear about canard aircraft, in which case I will consider my job as being complete :-).

They seemed happy with the presentation, but all feedback, discussion and virtual rotten tomatoes are welcome.

--
Marc J. Zeitlin                      marc_zeitlin@...
                                            http://www.cozybuilders.org/
Copyright © 2021                     Burnside Aerospace


Need Long EZ Nose Gear assembly

Phillip Camarda
 

I am looking for a used (serviceable or non-serviceable) Long EZ Nose gear assembly. I need it for mock-up purposes. If you have one that you are not using setting around collecting dust please contact me. I will pay for shipping.

Phil Camarda
Please use this eMail:     UH1CW2@...


Re: Air intake selector valve

Billy Rose
 

A terrible idea? If you are on a budget to go fast I think it was a great idea. The engine is always protected.  
Billy Rose. 
Longez builder on a budget


On Feb 19, 2021, at 10:26 AM, Bob Holliston <bob.holliston@...> wrote:


That three into one intake system took some thinking (and fabrication). It's a perfect example of what you can do with composites. Can you imagine trying to do that with aluminum? That (plans) firewall mounted air filter was a terrible idea. When I moved the air filter from the firewall to a carb mounted airbox on my first LongEZ I picked up over 100 RPM static. Also 10 MPH on the top end, the same as adding wheel fairings. I'll bet there's still lots of EZ's still flying with that HP robbing intake system. 

On Fri, Feb 19, 2021 at 2:50 AM Mike Tooze via groups.io <miketooze=btinternet.com@groups.io> wrote:
Well! This takes me back.


Bill's photo also shows part of Rudi's exhaust system. (Although the rest of it should be visible but is removed for some reason at the time of taking the photo.)

This was a work of art. Made by beating out sheet segments joined to form two halves in stainless steel. These were welded length-wise together, horizontal welds along each side. The four pipes joined to an equally beautifully made twin-walled silencer crossing over to exit from the left cowl.


I was with Rudi at our national fly-in. We were rather too much surrounded by onlookers. Suddenly Rudi stepped forward and flipped the prop. It immediately started, so quiet that few in the crowd had the thought to step back!

His four into one pipe was perhaps the inspiration for my 4 into 1, although there the the likeness ends.


Many, many, years later I found a guy at our field, very much a bodger and second /third owner of a Var Eze, about the throw away an exhaust system. 'Gives off too much heat' he remarked. I couldn't believe my eyes! - It was Rudi's 4:1 exhaust - unique! I advised him to insulate/wrap it in or give it away to a more appreciative owner.


No idea as to how it got onto that Vari as it wasn't Rudi's. However Rudi did have a coming together with the landing lights at Blackpool so perhaps the exhaust parted with Rudi after that. Just a guess.


My 2d contribution to VE history,


Sincerely.


Mike T, O-235 VE





------ Original Message ------
From: "Bill Allen" <billallensworld@...>
To: "Canard Aviators" <canard-aviators@canardzone.groups.io>
Sent: Thursday, 18 Feb, 21 At 10:35
Subject: [c-a] Air intake selector valve

Back in about 1980 I visited Rudi Kurth, a legendary Swiss engineer (and World sidecar Champion) who had taken time out from his motorcycle racing to build one of the first (if not THE first) VariEze (google HB YBG) in Europe, and it was a work of art.
I was about to start on the build of my LongEz and in those pre-internet Dark Ages, if you wanted to see an Ez you had to travel a long way to get hints and tips. Switzerland from the UK is a couple of days drive, not the mouse click it now is.

One of the things I noticed was his unique “rotary valve” carb selector. He could select filtered air, hot air or ram air in one neat unit.
So if anyone it thinking of getting the performance increase from ram air, but retaining filtered air, and carb heat, this is a neat way to go.

Bill Allen

<91D01F0F-44F3-4D28-A9AE-446EECC35C39.jpeg>
<3705548B-D7E3-4DFF-86B8-0F7C23BC614C.jpeg>

--



--


Re: LoVac troubles

David Fife
 

I would like to know how much vacuum you are pulling. Another question, do you degas your epoxy before infusing. This eliminates most of the air in your mixture and aids in 100% saturation of the cloth.
Dave Fife, long ez 12 Lz

On Mar 1, 2021, at 7:35 AM, Todd Carrico <tcarrico.cozy@gmail.com> wrote:


On 2/28/2021 8:42 PM, Lutorm wrote:
Hey all,

I've been experimenting with the LoVac method as outlined
at http://www.cozygirrrl.com/lovac.htm. It does splendidly at making the
cloth conform to the shape of the foam, but the layup ends up looking
very dry. It is definitely not dry when I apply the vacuum, so I'm not
sure if this is the paper towels sucking up too much resin or if air is
getting sucked out of the foam surface and into the layup.

Here's an example. I tried to do a very meticulous job of getting the
slurry into all the voids in the foam on this test piece. I heated the
slurry with a hot air gun to make the air pop out, squeegeed again, and
repeated this twice after which heating more did not seem to bring out
more air. Then I added peel ply (quite wet), paper towers, and pulled
vacuum, the pressure was about 30kPa/0.3 atmospheres. Yet, when I pulled
the paper towers off, the peel ply looked very dry:
Do you have any leaks in your bag? If you have leaks, you are pulling air into the layup. What epoxy system are you using?


2021-02-27 14.11.45.jpg

And after pulling the peel ply, the layup looks dry, too. Part of the
pattern is the imprint of the peel ply, but there are definitely white
spots in the cloth pattern.
Are your paper towels soaked with epoxy, or are they dry as well?


2021-02-27 17.40.25.jpg

I guess it could still be air (or micro) being sucked up into the cloth.
Given that it's under vacuum, air shouldn't be able to get into the
cloth unless it's already present somewhere under it.

Does anyone have any tips about this? I guess one test I can do is to
fill the foam with pure epoxy, that would eliminate the possibility of
the white being micro.
Tc



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