I recently bought a new GWS 4 channel park fly receiver for my combat plane thinking the same thing that it could be used because your mostly within 300-600 feet from the flight line. The cost was only $20.00 new with a $9 dollar Futaba crystal.

On my first flight out at around 200 feet, I noticed a disturbing intermittant (and thankfully, short) loss of control. This was during a .15 SSC round with 4-6 other combatants and as was previously noted, I believe the intermittance was due to radio interference from other's nearby.

After replacing the receiver with a standard Futaba model, there has been no repeat of this problem. I really hated spending $57 dollars plus another $11 for a receiver and crystal but it just wasn't safe in my opinion to run a single conversion receiver.