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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)
LML website: http://www.olsusa.com/Users/Mkaye/maillist.html
Builders' Bookstore: http://www.buildersbooks.com/lancair
Please send your photos and drawings to marvkaye@olsusa.com.
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