ORIGINAL: ohnoucdat
I have U-CAN-DO with 91 4 Stroke on it I had plane on stand breaking in engine. I started to do a range check didn't get 10 feet away and surfaces started jumping around throttle even changed. I tried it again it didn't do it. So I try again and it does it again surfaces just start jumping around. I have the antenna wire in the fuse with about 6" of it coming out the bottom it's in a tube away from the extensions. Any suggestions would be helpful
My bet is your SWITCH. If possible try a run-up with a direct connection, that is bypass the switch. Or have your helper hold the switch tightly in the ON position. If no problem then replace the switch. These switches that come with most radios can be bad apples. Same for a couple after-market ones.
Another item is you may need filters on the wiring. I had one large model that went able-sugar with the elevators when the engine was throttled up. I added filters, then the rudder went able-sugar. Servos in the back with long leads from the receiver.
I added another filter to the rudder and all problems went away. Later I tried removing the filters but the problems returned so they stayed. Other models with longer leads have not had such a problem. Beats H out of me! D if I know!
