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Date: Tue, 04 Mar 2014 07:21:39 -0500
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Subject: Re: [LML] Canopy Latch modeling
From: Paul Miller <pjdmiller@gmail.com>
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Steve: You said it:  it is simply "assumptions" on our part. When =
someone with hard facts can teach me what changes when the canopy opens =
then I'll have some confidence in what the issue is.  The solution seems =
clear--keep it closed.  The physics of what happens is intriguing and =
not related to the issue of designing a better system or secondary latch =
so nobody needs the model, it is just good practice to try understand =
what kills people without causing further harm or damage.  I'd like to =
understand why this problem occurs even if I don't retrofit the safety =
latch.   The stories and accidents don't provide a solid answer.   I'd =
just like to know how an airplane with wings and operating engine can =
"stall" and lead to "loss of control" as you stated just because the =
canopy opens.   Lots of ideas, short on facts as a group on this issue.

Let me ask these questions to the group, speculation is permitted since =
we have no data:

a) is the canopy generating lift when closed? If so, does that lift =
decrease or increase when unlatched?
b) Does the CG of the aircraft change between open and closed canopy in =
flight?
c) Does drag increase between open and closed in flight?
d) What does a pilot do when all that noise and flying paper occurs?  =
Full throttle, decrease power?

Paul=