shaw.peter(at)gmail.com
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 Posted: Fri Apr 26, 2013 1:06 am Post subject: Yak-List Digest: 1 Msgs - 04/24/13 |
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Having seen a Yak 50 land wheels up I can guarantee that the theoretical loss of "a tenth of an inch per rotation" does not occur.
Because the flare is at a normal height (unintentional wheels up) the aircraft then drops the undercarriage length stalled, and in this case snapped all three blades off in one revolution, all at the thick part of the chord.
Check out the remains of a prop strike, it will not consist of several slivers of tenth of an inch long pieces of prop, rather foot long chunks snapped off!
So, check out properly for engine damage after a prop strike, it is not a benign event that gently machines the prop length down.
Regards,
Pete
On 25 April 2013 11:02, Yak-List Digest Server <yak-list(at)matronics.com (yak-list(at)matronics.com)> wrote:
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Total Messages Posted Wed 04/24/13: 1
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1. 08:24 AM - Re: Re: Re: Hydraulic Lock (Bitterlich, Mark G CIV NAVAIR, WD)
________________________________ Message 1 _____________________________________
Time: 08:24:17 AM PST US
Subject: RE: Re: Re: Hydraulic Lock
From: "Bitterlich, Mark G CIV NAVAIR, WD" <mark.bitterlich(at)navy.mil (mark.bitterlich(at)navy.mil)>
Actually this is very good information to keep in mind, and I am going
to chew on the physics of that answer for a day or two. It poses a very
interesting study in the stresses involved and should make for a rather
intense dinner table debate!  (Not you, my engineering friends!)
Thanks for writing back Jill.
So given this information, what is the advice of M14P.com regarding prop
strikes and what should be done to the engine afterwards?
Mark
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