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Global Aviation Support Pty. Ltd
Sunshine Coast Airport, Queensland, Australia
Tel: 07 5448 8877 Fax: 07 5448 8866
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Frequently Asked Questions About Sun Shields
How do the sun shields stay in place?
Do you use suction cups to hold the shields in place?
Will they scratch the windows?
How much do they weigh and how do they store?
Doesn't the sun that is reflected back through the Plexiglas increase the temperature of the glass and accelerate crazing?
What causes crazing?
Why are the shields made from aluminum with a clear coating?
How do the sun shields stay in place?
They wedge into the window moulding like a picture wedges into a picture frame and stay in place without Velcro or suction cups because they are perfectly sized.

Do you use suction cups to hold the shields in place?
No suction cups are needed because each shield is designed so that it does wedge into the window moulding perfectly. Suction cups are not needed.

Will they scratch the windows?
Kennon Sun Shields are coated with a clear polyester coating that prevents the aluminium shield from oxidizing and scratching your windows. Not to be confused with look-alike material sold by Sporty's Pilot Shop or your local hardware store. That material though similar in appearance is not coated and will scratch your windows and is not a bargain at any price.

Keep your windows dust free and clean and use care when installing the shields.

How much do they weigh and how do they store?
The set for an average plane weighs 4 pounds and stores in a nylon storage bag that is the height of your windshield (32 +/- inches) and is about 6 inches in diameter.

Doesn't the sun that is reflected back through the Plexiglas increase the temperature of the glass and accelerate crazing?
Heat causes crazing. But the sun doesn't product heat until it is absorbed. The sun's heat causing rays act much like light rays, they pass back through the Plexiglas with very little absorption because Plexiglas is translucent. In fact, safety tests conducted by the Air Force confirmed that before the shields were approved for safe use in DOD aircraft.

What causes crazing?
Crazing is most likely caused by the heating and cooling of the Plexiglas caused by the changes in the temperature inside the aircraft. The heat build-up inside the cabin is like that inside a greenhouse. Temperatures can exceed 200 degrees F. The heat has no where to go and the Plexiglas windows heat up.

Plexiglas starts out as a flat sheet and is shaped with heat. When it gets hot, it wants to return to its original flat shape. Then it cools when the sun goes down. This constant stress on the curved areas of the windshield causes what most people think of as crazing. All you have to do is look at an older windshield of an unprotected aircraft and you will notice crazing at the curved portions of the windshield.

If you keep the cabin cool, the outside air movement against the Plexiglas will keep it cool and you will eliminate the stress caused by the expansion and contraction of the Plexiglas caused by extreme temperature fluctuations.

Why are the shields made from aluminum with a clear coating?
Because aluminum reflects 97% of the sun's rays and absorbs only 3% that is changed into heat. With a clear coating the shield reflects 93% and absorbs 7%. A coloured coating, even a shinny gold coloured coating reduces the reflectivity to less than 70% with 30% or more of the sun's rays being absorbed. That is why we use a clear coating instead of a coloured coating. A coloured coating absorbs the sun and the shield be comes hot, in turn, the plexiglass heats up. That defeats the purpose.

© 1999-2004, Global Aviation Support Pty Ltd
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