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Date: Thu, 03 May 2012 13:20:51 -0400
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From: Dave Saylor <dave.saylor.aircrafters@gmail.com>
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Subject: Re: [LML] Re: Harry League & Pat Franzen fatal IVPT accident4/23/2012
X-Original-To: Lancair Mailing List <lml@lancaironline.net>
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 It looks like the edges were finished with flox or micro, which is fine
for unloaded panels.  I think you would end up with a much stronger
structure than the one pictured if the inner and outer skins around the
circumference were joined after chamfering the core.   For structural
applications my understanding is that bringing the skins together, as seen
around the windows and access panels, results in a "closed" structure.  Of
course that doesn't guarantee that the mod is strong enough, just that it's
as strong as it can be.

--Dave Saylor



On Thu, May 3, 2012 at 5:28 AM, Lancair <lancair-esp@ustek.com> wrote:

> I installed the A/C for my ES-P by cutting three smaller holes trailing
> aft and bonded a plenum over them for better airflow and strength.
> Photo attached.
>
> Robert M. Simon
> ES-P N301ES
>
>
> -----Original Message-----
> From: Dr. Weinsweig [mailto:weinsweigd@tsnci.com]
> Charlie, I agree that it must seem obvious to anyone who has been
> involved in building a IV that the area of the fuselage behind the gear
> doors where the A/C holes that you reference are made has to be the
> weakest area of the fuselage.  We installed Mike Custard's vertical fin
> extension to give better yaw stability(in addition to the strakes) on my
> propjet and unscientifically to my eye, this seems to beef up this area
> though from the top rather than the underside.  If any structural
> testing takes place I think that this modification should also be tested
> to see if it helps. Thoughts?
>
> --
> For archives and unsub
> http://mail.lancaironline.net:81/lists/lml/List.html
>
>

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 It looks like the edges were finished with flox or micro, which is fine fo=
r unloaded panels.=C2=A0 I think you would end up with a much stronger stru=
cture than the one pictured if the inner and outer skins around the circumf=
erence were joined after chamfering the core.=C2=A0=C2=A0 For structural ap=
plications my understanding is that bringing the skins together, as seen ar=
ound the windows and access panels, results in a &quot;closed&quot; structu=
re.=C2=A0 Of course that doesn&#39;t guarantee that the mod is strong enoug=
h, just that it&#39;s as strong as it can be.<br>

<br clear=3D"all">--Dave Saylor<br><br>
<br><br><div class=3D"gmail_quote">On Thu, May 3, 2012 at 5:28 AM, Lancair =
<span dir=3D"ltr">&lt;<a href=3D"mailto:lancair-esp@ustek.com" target=3D"_b=
lank">lancair-esp@ustek.com</a>&gt;</span> wrote:<br><blockquote class=3D"g=
mail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-l=
eft:1ex">

I installed the A/C for my ES-P by cutting three smaller holes trailing<br>
aft and bonded a plenum over them for better airflow and strength.<br>
Photo attached.<br>
<br>
Robert M. Simon<br>
ES-P N301ES<br>
<br>
<br>
-----Original Message-----<br>
From: Dr. Weinsweig [mailto:<a href=3D"mailto:weinsweigd@tsnci.com">weinswe=
igd@tsnci.com</a>]<br>
Charlie, I agree that it must seem obvious to anyone who has been<br>
involved in building a IV that the area of the fuselage behind the gear<br>
doors where the A/C holes that you reference are made has to be the<br>
weakest area of the fuselage. =C2=A0We installed Mike Custard&#39;s vertica=
l fin<br>
extension to give better yaw stability(in addition to the strakes) on my<br=
>
propjet and unscientifically to my eye, this seems to beef up this area<br>
though from the top rather than the underside. =C2=A0If any structural<br>
testing takes place I think that this modification should also be tested<br=
>
to see if it helps. Thoughts?<br>
<br>--<br>
For archives and unsub <a href=3D"http://mail.lancaironline.net:81/lists/lm=
l/List.html" target=3D"_blank">http://mail.lancaironline.net:81/lists/lml/L=
ist.html</a><br>
<br></blockquote></div><br>

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