ORIGINAL: CGRetired
ORIGINAL: landeck
It is to protect them from vibration. If the crystal breaks in the rx or a contact breaks in the battery, you are going to lose the plane. Not necessary so with a boat or car. Note that the new 2.4Ghz receivers to not have crystals and therefore the need to wrap them in foam is not really necessary.
Br;uce
Why is that, Bruce? If it's 72 MHz, you still have a crystal. And you still have vibaration caused by the glow powered engine as well as vibration from driving on land or of boating over the water.
CGr.
CGR, good question and I don't know the answer. But I have noticed that the majority of car/boat people do not use foam around the receiver. Could be they are not as concerned about the consequences of losing the radio because it does not always mean the total destruction of the vehicle.
I should have added to my post the fact that I do mount my 2.4 Ghz receivers on a pad of foam using tie wraps or velcro unlike my 72 Mhz receivers which I wrap in foam.
Bruce