The thread below I think covered the failsafe/runaway topic pretty well..

Other then the few inline aftermarket failsafes, I believe I saw a Futaba receiver that had a built in failsafe with some advanced interference circuitry. Like the ability to verifiy the signal was from a futaba TX. I forgot which model it was but I'm sure it was a Futaba TX/RX.

http://www.rcuniverse.com/forum/Fail...1626605/tm.htm