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Attaching plexiglas windshield to composite fuselage

thread6-77955

Attaching plexiglas windshield to composite fuselage

Attaching plexiglas windshield to composite fuselage

(OP)
Dear ladies and gentlemen

Could somebody out there give me some details on how to actually fix (bond and clamp or just bond) a 5mm thick plexiglass windshield (simmilar shape and size as the EC135 windshields) to a composite fuselage structure of a two bladed helicopter.

1. What needs to be considered in terms of possible fuselage oscilations and the effect on the bonding/sealer?
2. Would a mechanical clamping in addition to a 5mm thick  flexible sealer/bonding layer be of any advantage?

How do the professional manufacturers do it?

Thank you in advance.

Thys Pieterse

RE: Attaching plexiglas windshield to composite fuselage

The method that I have seen used many times is as follows:
a rubber grommet of a given dia. is used in a hole that is larger then the fastening screw. the grommet thickness is greater then the windshield thickness and/or over-laps the windshield. the screw is then passed thru the windshield hole and thru the composite hole. a nylock nut is then placed on the screw. using flathead screws keeps the outer surface smooth.

Hope this helps!

Tim Blackwell
Gyro-designer

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