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With my arrangement the cam shape on the latch requires more energy, a hard push on the handle, to release the latch (which additionally had to be pulled back to release.).
The cam (and spring) tends to hold the latch 'home' and further towards the micro switch. i.e. further to the locked state. But in practice the micro switch is only made when the latch is fully home against the spigot of the handle.
When closing my canopy I don't rely on the spring. I operate the handle (left hand) and snug up the latch with my right thumb.
When locked it would require a mechanical failure or the laws of quantum mechanics invoked to release the canopy without pilot involvement.;^)
On Friday, 24 January 2020, 02:20:27 GMT, Dale Martin <niceez@...> wrote:
>>>Latch to include a micro switch for the Eze warning system<<<
One thing I change on most aircraft with the complaint that the warning horn is intermittent.
The plans system attaches the micro-switch to the handle such that I have witnessed to LEZ pilots start the take-off roll and abort because the canopy started lifting up.
It was due to the latch being secured but the latch was not engaged. What the pilot needs to know is if that the canopy handle pawl has fully engage the canopy pins (screws) and is fully down when the canopy handle is locked in the latch. And if so THEN and ONLY THEN, should the micro-switch indicate the canopy is SAFE.
On clients aircraft we install The Shark Tooth Latching part only to the stock canopy handle and mount the micro-switch under the longeron and use a proximity pin that is forced downward by the canopy. The canopy can only close this tight when the handle and pawls are engaged.
Yes, we have pictures for those interested.
Ron makes some good points.
A Requirement is needed before designing anything.
For the Vari Eze /Long Eze canopy latch/lock system.
An example that is probably incomplete/can be improved:-
Secure canopy for flight - unaffected by in-flight vibration.
Operable with arm/hand strength of a teenage girl.
To be 'security locked' from outside without use of a 'door'.
Security lock will not 'over centre' the latch mechanism.
Security key lock to be flush with outside fuselage.
Latch to include a micro switch for the Eze warning system
Must be able to be opened by GIB.
Independent of safety catch.
Independent from Latch.
Automatically engages when canopy is closed.
Can be reached/released by pilot and GIB
Attached photos of my solution sorry about their poor quality. I was leaning over for outside and hence all a bit shaky.
Note the photos were taken with the canopy open so actual latching is not shown - but works fine.
Mike Tooze O-235 VE G-EMMY
On Tuesday, 21 January 2020, 17:48:01 GMT, Ron Springer <ron228rj@...
I have the rotary latch and I both like it and hate it. On my first flight with it, it slowly walked itself open during climbout and tried to kill me. Luckily the safety catch did its job. On the ground, I can sit in the plane with it latched and push up as hard as I want and the canopy won't budge. But, in an environment with vibration and buffeting, it can rotate itself open.
It depends on being over center and/or friction to stop it from rotating open. I don't think you should depend on a canopy being held closed by those things. I discovered that I am not the only one that has experienced this problem. It needs to have a real locking mechanism. I modified mine so it can't happen again.
On Tue, Jan 21, 2020 at 12:11 PM Nick U <unick3@...
I found the rotary latch from www.eznoselift.com
to be an easy install and works great. I was able to close off the door, and now only have a small hole in the side of the plane for the key. It works with the existing LGEZ hardware too.
LongEZ N29TM (for sale)
Cozy 4, N826ER
On Jan 19, 2020, at 1:56 PM, Doug Kan <doug@...
Anybody know of a good and hopefully inexpensive flush door handle for a LongEz. Maybe something like the Tesla door handle?