ORIGINAL: flycatch
I find it odd that people are still using foam of any type. I never mounted my fuel tank or rx in foam while flying r/c nitro powered helicopters. I not saying that the receiver should be rigid mounted using doubled sided carpert tape works fine. Once the receiver is mounted insure you use a tie down to keep it in position.
Old habits are hard to break. I still pad my reciever, batteryand fuel tank