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From: "Alister Yeoman" <yeoman@voyager.co.nz>
To: "Murphy Rebel" <murphy-rebel@dcsol.com>
Subject: Re: strengthening for O320 and spring gear; float reinforcement?
Date: Mon, 23 Nov 1998 08:25:00 +1300
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Dave,
Thanks for the feed back, just one question, do you still only have one
line of rivets up the door post? What I mean by that is, have you fitted a
right angle bracket from the front of the door post on to the FUS 11 etc.?
this can help a lot to increase the shear loads in this area.
Alister
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know, IFrom: subersys <subersys@nidlink.com>
To: (Murphy Rebel) <murphy-rebel@dcsol.com>
Subject: Re: strengthening for O320 and spring gear; floatreinforcement?
Date: Monday, November 23, 1998 1:41 AM
Back again on this subject.What area's in the nose area do you consider need more strenght?
Cheers
Alister
While the strength of the nose has never been a question as far as I
frontwould like you to consider this.
The structure of the nose is cause for concern due to the now requested
strengthening of the attach points of it to the door frame and up by the
groundwing attach points. I experienced total failure of these points in my
wereloop. All rivets on the right door post sheared yet the parts themself
havenot even bent. The holes weren't even ovaled. Just cut off rivets. I
stainless(long before the AD) replaced the rivets with everyother one being
sidesteel. Much harder to shear. The nose itself came into question as the
comparingforce of the loop almost wrenched the engine off the airplane. In
inducedthe structure to Cessna, there is no comparison. Side forces will be
reinforce.from time to time in the normal life of the airframe so I chose to
IMaybe I overkilled the reinforcement, but here is what I did on the nose.
Iincreased the overlap of the side panels and the corner wraps to a full 2
inches and ran 2 rows of rivets. What a difference that made. But then
material.backed each seam up with a piece of ST-31 that I made out of .032
rivets.These run all the way back to the door post and rivet with the 3\16"
butThe motor mounts I backed up not only with the backing plate called for
created athey also sit in a piece of this ST31 material. They also go back to
substantial material for termination with large rivets. The floor I
peddletriangle structure of the ST31. The brake mounts are backed up, the
Thestructure is backed up and all is carried back to the cage and riveted.
Probablytop of the dash is the same, triangulate and tie to solid structure.
reduced.added 3 lbs in weight but the piece of mind load has been considerably
Dave Bangle
