Three things:

1) Futaba receiver? That's a big unit, how do you get it in there? Use an FMA Quantum; tiny and totally glitch free. I run my antenna out the bay, counterclockwise into the right wing, in front of the fuel tank, around the inside of the left wing then up against the center bay and out just ahead of the left elevon near the left fin. Never a glitch with the FMA Quantum!

2) Throttle servo. Needs to be vibration isolated. Use a nylon clevis on servo and throttle arm. These are threaded on short pieces of threaded rod that go into a big piece of inner nyrod in the middle between the two pieces of threaded rod. No vibration problems. I have been using a cheesy FMA S-100 on throttle with no problems in over 150 flights thanks to this vibration isolation setup.

3) What's with the 250 mah pack? You'd be lucky to have enough juice for one flight. You are running powerful, coreless, metal gear servos that take a lot of juice. If your pack is weak it is entirely possible your problems could be lack of power. Best to use an 1100 mah pack with those high-torque servos and have power in reserve.



You shouldn't be having the problems you are having. Hope this info helps.