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Message
Thanks for the gentle reminder Scott -
understand that the demands on the the canopy can be very high. A
reinforcing lay-up or mechanical fasteners on some designs is necessary to
resist the force of pressurization. You might be surprised - the forces on the
glider canopy can be quite high, but the force is mostly into the frame.
Temperature variation can be greater than you would typically see on the LNC2
(64'F ground to <-20'F at 26,000') and the thin, differently
expanding carbon frame presents some interesting mounting challenges.
The adhesive system has to be very good with the transfer adhesive and bonding
agent working together to assure a solid well sealed joint. Unfortunately I can
tell you from personal experience that it is impossible to remove the
polycarbonate without breaking and attacking it in small pieces.
<g>
What is Lancair using for canopy bonding in
the current kits, particularly the L4P aircraft.
Rick Lafford
Who's unfortunately stuck with spam cans
right now.
In a message dated 1/20/2004 9:59:11 PM Central Standard Time,
marv@lancaironline.net writes:
The transfer tape allows the polycarbonate canopy to
be
removed from the frame if needed.
Rick,
Just a wee reminder - Gliders seldom exceed 200Kts, Lancairs regularly
do. Pressurized Lancairs have exceptional forces on the windows, but
even LNC2 drivers would prefer that the look through parts stay in
place. My glass is "bonded" in with the 3M structural adhesive supplied
with my 1989 kit (I don't remember the type) and has not been a problem as the
plexiglass bonded surface was carefully sanded and cleaned -- A flox
fillet and an ample 2 BID was applied over the joint.
Scott Krueger
Traveling via Lancair (Is there any other
way?)
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