Thanks Curt, I think my X-Plane Cozy came from you. Years ago in the cold snowy Winter up North the only flying I could do was X-Plane. Here is a video from my screen with my iPad and Foreflight connected to X-Plane superimposed on the screen. Cozy IV in X-plane at Tri-Cities, KCZG - YouTube I have some issues getting the Cozy to work with the upgrade from V10 to V11 I will get you off line for help. Del Schier Cozy IV N197DL Cannon Creek Airpark 15FL
From: curtb442 via COZY Builders Mailing List <cozy_builders@...> Sent: Friday, July 15, 2022 8:42 PM To: Kenneth Larson <kennethjlarson@...> Cc: Cozy Group <Cozy_Builders@...>; Canard Aviators <canard-aviators@canardzone.groups.io> Subject: COZY: Canards in X-Plane with EFB apps Yes, the canard flight models for X-Plane will always be free. I have been compensated otherwise for their development. Practicing at home is quite valuable. In addition to familiarity to aircraft handling and performance, and airport familiarity, there is an added benefit. FlyQ and ForeFlight EFB apps (and perhaps others) on tablet computers can connect to X-Plane using a home WiFi. You can use these apps at home just like you would in the real airplane, navigating over a geo-located aviation sectional. You can even fly Approach Plates that are geo-located. I have been doing more of this lately, and it seems there is always something new to learn that these apps include. Learning to use an EFB app in the real airplane is likely an unsafe practice. And not using one of these is really old-fashioned. With a wingtip-mounted ADS-B, a Raspberry Pi microcomputer, and my iPad running FlyQ, I have a tremendous navigation system, including a Synthetic ADHRS attitude display. These are priceless additions to a 1983 VariEze which otherwise has a very limited panel. I can see plotted targets of other aircraft around me, And this airplane is Visible to other aircraft for the first time since it was built. Beyond these features, there is another benefit that will be realized when I have 3D/VR versions of the airplanes. There is an ability to “grab the tablet display” right off your desk and pull it into the Virtual Reality Cockpit. It is the most amazing thing I have ever seen a computer do. But we aren’t there yet … VariEze, Cozy - Colorado
Do you share those Cozy files for X plane? I bought a Cozy 4 last year and have been learning in the airplane. It would be nice to practice at home.
On Jul 15, 2022, at 4:59 PM, curtb442 via COZY Builders Mailing List <cozy_builders@...> wrote:
I have more accurate data for the Eppler and Roncz airfoils in X-Plane … if I have the correct Eppler. Actual behavior and responses seem to indicate the data is better for the canard configuration. And one thing to remember regarding “nibble up to the limits” … I am seeing a Wing Drop currently with the W&B and CG in tests. We should expect this in a real airplane, before experiencing a deep stall. The builder of my VariEze, Joe Kendrick, deep stalled this VariEze once, also at 13,000 feet over Grand Junction. But he was a very big guy in a smaller airplane, and was able to rock the aircraft into a roll and recovered, at 9,000 feet. VariEze, Cozy - Colorado
How much margin is there between the 102" aft CG limit and the CG for which a main wing stall is expected?
So on a Long-EZ, with an aft CG limit of 103" (originally 104" but moved forward an inch after a few years) deep stalls will occur (at least on Mike Melvill's plane) at a CG of about 106", which is also close to the Neutral Point (where pitch stability becomes neutral), which is theoretically at about 105". On a COZY MKIV, with the shortened canard, the deep stall location will be somewhere in the 103" - 104" range. I don't know of any experiments done on COZY III's, or deep stalls with COZY III's, so although I'd expect it to be about the same as a COZY MKIV, given the width and shape of the fuselage forward of the CG (maybe around 104"), no one knows for sure. Without installing moveable ballast, is there any safe way to determine the CG for main wing stall?
Nope. You can nibble up to the limits, but tickling that tiger is not particularly intelligent. Mike deep stalled his Long-EZ on purpose for testing, starting at 13K ft. He recovered at about 1K ft. above the supermarket in Mojave. So, no.
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