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High Flight Articles

Volume VIII, No. 4, Page 22



VIBRATION AND FOAM VS FOAM
By Ed Moorman IMAA 2540

Here's a note for beginners with regard to vibration. Giants usually have a lot of vibration so we need all the protection we can get. Naturally, we always wrap our receiver and batteries in foam for protection. Well, there is foam and there is foam. What I mean is that some foam is foam rubber and some is foam plastic. A lot of the foam that you buy in the local stores is a plastic foam. Plastic foam does not give the protection from vibration that real foam rubber does. Foam rubber is usually white and it has a rubbery feeling. It is also normally heavier in weight than foam plastic. The foam sold by Sig and Goldberg is good foam rubber. The grey stuff you can pick up now and then is probably foam plastic. Don't use it for radios. Stuff it around your tank or something.

Another type of foam is the harder foam that is sometimes called "G pad." It is used in motorcycle helmets and on dash boards of cars. You can bang your head into it and hopefully not get a fractured skull. At one time it was advertised as great for crash protection. It is, but it sure doesn't do anything for vibration. Your receiver will shake apart, but when the plane bashes, the receiver case won't be broken. G pad is good to put in the front of the radio compartment of any plane you plan to crash. However, don't make a box of it and stuff your receiver inside. Wrap the receiver in the soft foam rubber. You can put this package inside anything you want.

Bottom line here: Don't save a couple of bucks on foam and take a chance on a vibration-related accident. Get the good stuff, FOAM RUBBER, and use a lot of it.


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