I recently had some excitement while practicing snaps with my canopy, it popped open and jammed... I had my cell phone with me and was able to get a hold of neighbor to push the canopy back into the track so I could get out. If you have a tip-over canopy you won't have to worry about this one.
My canopy setup is stock Pitts S-1S/S-1T. The windshield is also Pitts, but it was left about 3" longer front to back which changes the fit between the canopy and windshield. Mine also has longer rails on the fuse so the canopy completely opens beyond the cockpit.
Prior to this I had the canopy unlatch on one side and I had adjusted the slide rails on the fuse so that both latches engage at the same time. I thought that the latches and the canopy to windshield fit was all that contained the front of the canopy. That is not the case!
The way the canopy slider works is that there is a "truck" with ball bearings that rolls between the outer rail attached to the fuse and the inner rail attached to the canopy. In my slide there are 6 ball bearings, 3 on top and three on the bottom. When the canopy is fully open the "truck" with the ball bearings is all the way to the rear of the rail attached to the fuse and all the way forward with regards to the canopy rail. When the canopy closes the "truck" with the ball bearings only moves at 1/2 the speed and distance of the canopy itself. So when the canopy is fully closed the ball bearings supporting the canopy are only half way down the fuse rail and in my case near the rear of the canopy.
So what exactly is supporting the front of the canopy? Turns out it's just a vertical bolt through the inner rail with a rounded head and nut... Per Aviat drawings.
Here's what mine was looking like
My fix was to machine up some cylinders slightly undersize of the ball bearing balls. One was drilled and tapped and the other C-bored. I made a set out of stainless and the other from bearing bronze. The cap screw is Loctited in, but it can't go anywhere anyway.
And this is what they look like installed. The front of the canopy is very securely held in place now.
If you have a slider canopy this is definitely something you want to take a look at.
- by Chris Thomas 28 Aug 2018 13:33 One Design View the latest post Replies 12 Views 6774
- by One Winged Junkie 11 Aug 2018 09:09 Horizon employee steals Q400 and does aerobatics View the latest post Replies 1 Views 435
- by One Winged Junkie 10 Aug 2018 13:54 Alliance Air Falcon 20 - (TX Operator) Querétaro Airport (QRO/MMQT) View the latest post Replies 1 Views 450
- by SHIPCHIEF 22 Jul 2018 18:27 M9F Magneto View the latest post Replies 5 Views 657
- by One Winged Junkie 22 Jul 2018 17:54 Convair 340 Pretoria S.Africa, 19 Injured, 1 Fatal 7/10/18 View the latest post Replies 1 Views 492
- by One Winged Junkie 19 Jul 2018 08:11 Another crash with Dean Aviation 4 fatal - Miami View the latest post Replies 1 Views 512
The Smithsonian National Air and Space Museum credits the Laser 200 for bringing about a new generation of aerobatic aircraft