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1. 06:26 AM - Re: cracks (andy thomas)
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--> TeamGrumman-List message posted by: "andy thomas" <andy@webshoppe.net>
Gary,
Glad to hear you are so far along....I too like the idea of tying the left
side to the right to provide a transfer and sharing of the load/twist....I
understand the Traveller and AA1s are designed that way and they seem to
don't have the problem
I have located the DER that has the approved 8180-3 that is being used in
the east and have had good discussions with him....the thing I do like about
his fix is that it leaves the present structure in place for whatever
strength it provides, even if it is defective, and adds an angle
doubler....the thing I don't like about it is it doesn't tie the sides
together....I visualize the "perfect fix to be what I call a "ring spar"
like the B25 wing spar that carries the load from wing to wing but is open
in the center (for the crew to pass through)....in our case control cables
etc., and could be assembled in place....
I have about 20 people on my list who are anxious to have a fix available in
case they need it....I'll tell them about your progress and direction in my
next update if you have no objection
David Fletcher has an aft section that he says is available for a mock up
but he is pursuing a similar goal so I don't know the dynamics of
that....but he does have one (or more ?)
good luck....and I will look forward to hearing of your progress
Andy Thomas
----- Original Message -----
From: <TeamGrumman@aol.com>
Subject: TeamGrumman-List: cracks
> --> TeamGrumman-List message posted by: TeamGrumman@aol.com
>
> I just started an annual on a 76 Tiger. 4000 hours. No cracks.
> Seriously. No cracks.
>
> Based on what the DER has told me, it's the rudder being deflected hard as
in
> a slip or ? that causes the most twist in the torque box formed to support
> the horizontal. The action of the rudder deflection is passed primarily
> through the rear bulkhead. Then the section between the rear bulkhead
and the
> horizontal support tries to follow. The large horizontal tries to follow
and the
> inertia is absorbed in the skin of the empenage. Had the vertical
supports
> (to which the horizontal is attached) been properly tied to tray (called
the
> horizontal bulkhead) on which the ELT is mounted, the torque would have
been
> more effectively transmitted to the fuselage and that section would not
have
> flexed (referred to as 'racking') and would not have caused cracking in
the lower
> stiffener. The fix we are working on forms a lightweight bulkhead
> (semi-solid) across most of the section.
>
> Tail dragger anyone? With the tail strengthened ....
>
> Also, IF YOU KNOW OF ANYONE WHO HAS A REAR SECTION THAT CAN BE DONATED FOR
> FITTING THE BULKHEAD, PLEASE LET ME KNOW. ALL I NEED IS THE LAST 20-24
INCHES
> OF THE FUSELAGE.
>
> GARY
>
>
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