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From: "Rumburg, William" <wrumburg@cdicorp.com>
To: "'lancair.list@olsusa.com'" <lancair.list@olsusa.com>
Subject: FW: Canopy fitting
Date: Fri, 31 Mar 2000 09:39:25 -0500
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>>

>Thanks for your reply.  I will revisit the bottom front area and add some
> more stiffening.  It could be that the distortion is taking place in that
> area which has the apparent result of allowing the canopy to appear to
> move aft.  I did it as per the manual but whoever said that it was always
> correct.  I also narrowed the sides as you did.
> Ian -
    I'm posting this reply to the LML because it may be of interst to
 others who have installed the forward hinged canopy to structure other
 than the header tank...
    I installed my forward hinged canopy in accordance with the
 instructions supplied and it closes with NO distortion whatsoever, so the
 system does work. However, my canopy brackets are mounted on a header
 tank, which greatly stiffens the quarter deck and is an extremely rigid
 mounting base itself. It's possible that your hinge mounting structure is
 yielding to the force indirectly applied by the gas struts when closing
 the canopy. That is a possibility you'd have to look at and determine
 yourself. 
    I read Doug Mitchell's reply. He noted that 16 plies of carbon fiber
 stiffener are required under the front of the canopy. After seven years,
 I'd forgotten the number of plies. These are applied over a foam spacer
 for added ridigity. I laid the carbon fiber on four plies at a time,
 allowing just enough time for the previous layup to partially cure. Since
 the phenolic hinge mounts install over the carbon fiber stiffeners, you
 must have already installed the carbon fiber. If rework of the carbon
 plies is necessary, it would, of course, required cutting off the phenolic
 mounts.
 Bill Rumburg
> N403WR  (Sonic bOOm)
>    

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