Re: Forward Canopy geometry

Richard Thomson


That is a great picture.

I notice you have closing plates at the end of your elevators, is your fuel tank behind that area or is there a void behind ?


Rich T.

On 22/03/2021 16:12, Jay Scheevel wrote:

Great story, Vern.


The fuel dump idea had occurred to me when I was building (and probably several others on this list), but I could not find a way to make it happen expeditiously, especially from the header tank, so I did not do that. I did make sure that if the tanks stay intact on a roll over, they will not dribble fuel all over me, but there is no guarantee that everything stays intact in such a circumstance that flips you over. Exiting the aircraft is a bit easier in my configuration, as the overhead console is very stiff (I have had two people sitting on it without any deflection, so will serve to keep the cockpit from being crushed. If you are inverted, once you push the door over center, it stays full open. Here is a photo of my configuration (taken immediately after my first flight).






From: <> On Behalf Of smeshno1@...
Sent: Monday, March 22, 2021 9:01 AM
Subject: Re: [Q-List] Forward Canopy geometry


 Ala.. Spitfire or perhaps P-51?  The addition of a carbon hoop "roll bar" already was in my build plan. I would like to see your split canopy method chosen. If in case of an unexpected Frankenbird "inverted parking position" I also planned on a simplistic fuel purge to be used prior to emergency touchdown. Offloading all the fuel possible would offer time to exit before a bar b cue event. 


 I've personally "enjoyed" an inflight fire. I had just soloed also. Had about 6.5 hours in my student pilot log book. 


 The transponder was removed for the inspection (the 152 was IFR equipped) and the remover (my instructor at the time) unknown to me failed to tie back the transponder co-axial cable behind the instrument panel. 


 Mr. Murphy stepped in on my solo flight (as he is quite apt to do in aviation) after the removal of the avionic unit, and the loose co-axial shielded ground cable welded itself to the positive buss bar behind the instrument panel. Sparks ..LOTs of sparks! The carpet was set I had the rather unpleasent experience of the WW1 "hot foot" and the single fuel selector valve near the flames in THICK acrid smoke.  Opened the window and hit the main "off" electrical..but still had flaming carpet only now with more oxygen on hand!!  Not a good situation.


 Altitude was about 1500 ft since I had just departed runway 18 so I was flying over a dense metropolitan part of North Little Rock at the time. I had my E6B available ( 1980 Jeppesen..metal and batteries required) and proceeded to stamp out the flaming carpet. Obviously, I made it back to the field.  On roll out I un-buckled,exited the aircraft at the point of a fast walking speed, and let her roll on. 


 Walked in shaken but otherwise ok to the FBO and promptly called the local FSDO office and the investigation later ended up being rather unfortunate for my flight instructor since he was also the aircraft owner. The co-axial was melted all the way back to the antenna on the belly...close to the lowest point fuel drain. Too close according to FAR's.


 So some of the ideas I intend to add are perhaps just stem from logic. Fuel dumps on Biz jets and Airliners are standard industry items for good reason..and for me this part of aviation systems safety is something I learned at 6 hours in my pilots log book.  Should be included on my homebuilt Experimentals. Cessna and Piper don't seem to think the same as I do on this topic. 


As the comedian Mr. Richard Prior once said "Fire is Inspirational!" I'll vouch that it is indeed.


 The canopy drag fairing and addition of the hoop are going in the build also. To emergency exit I plan on cutting the canopy from inside.           


 Any photos of your canopy mod?



From: <> on behalf of Jay Scheevel <jay@...>
Sent: Sunday, March 21, 2021 8:30 PM
To: <>
Subject: [Q-List] Forward Canopy geometry


Hi Vern,


I built a transition like you describe into my forward canopy. It was partially to cut that draggy transition you describe  and partially to facilitate my split canopy. The forward portion of my canopy is permanently mounted, so that gave me the option of modifying the transition area.





On Mar 21, 2021, at 5:54 PM, smeshno1@... wrote:



 Jay.. I was reviewing the high pressure areas on the Q2 plot and perhaps an addition of a fairing in front of the canopy/cowl location could be worthy of the effort. Jim Patillo in his tour video convinced me to rework the present forward hinged canopy on my shells (purchased the partial kit that way..but I was never comfortable with the workmanship..a bit ruff how the previous owner hinged it) to a parallel mechanism..but perhaps by canting the aft up..the canopy can fit behind a new blended fairing.


 Think how we insert a foot in a slip on shoe.  The old blonde joke.. TGIF.. Toes Go In First. Anyway..that is the visual. 


 The transition appears too blunt at present. 





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