Re: Sparrow strainer stall conundrum

Jay Scheevel

Thanks Michael,


I did read this after David pointed me in that direction. The problem with this approach is that the net moment arm is smaller because it is closer to the trailing edge, and the problem that the sparrow strainer is trying to solve is much larger than trying to balance trim spring loads. The basis of the problem is the shape of the elevator, which causes it to have a lot of upward deflection in the absence of the sparrow strainer. The issue that Burt was addressing was more of a tweak for builders that did not get everything perfectly set up while building.





From: <> On Behalf Of Michael Dunning
Sent: Wednesday, February 23, 2022 8:12 AM
Subject: Re: [Q-List] Sparrow strainer stall conundrum


Jay, that RAF CP 59 that Dave listed makes some interesting points. Burt recommended fixed tabs riveted on (and 10" long, to boot) to unload the elevator trim springs; different idea but something to think about.

Note that the attached pdf is one I found before he posted his repository link. Might be poor quality.

#2827 (still thinking about planning on visualizing how to finish building)

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