At a certain engine RPM my radio gear goes nuts ? Troubleshoot..
I only fly a couple times every summer so I took my old Avistar out, inspected all the controls and went flying..
My radio is a basic Futaba 4-channel FM bought in 2000 (Skysport4 I think ?) and at certain RPMs the airplane kind of dances, and sometimes the ailerons turn 200% right and elevator 200% up during a split second. I think one of my servos or the receiver reacts to a certain vibration frequency. Anyone experienced something like this ? |
RE: At a certain engine RPM my radio gear goes nuts ? Troubleshoot..
I have a Voltwatch inside and the battery was good. I tried with another battery pack as well with exact same results. I agree my radio is a bit old but I tought radios lasted a while.. I has different brand servos so I tought maybe some incompatibility issue but now I changed all the servos to Futaba S3003, S3004 and old FP-S148.
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RE: At a certain engine RPM my radio gear goes nuts ? Troubleshoot..
Get to the reciever and remove and replace the crystal to make sure it's seated properly.
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RE: At a certain engine RPM my radio gear goes nuts ? Troubleshoot..
ORIGINAL: iplayloud I only fly a couple times every summer so I took my old Avistar out, inspected all the controls and went flying.. My radio is a basic Futaba 4-channel FM bought in 2000 (Skysport4 I think ?) and at certain RPMs the airplane kind of dances, and sometimes the ailerons turn 200% right and elevator 200% up during a split second. I think one of my servos or the receiver reacts to a certain vibration frequency. Anyone experienced something like this ? Regards Alan T. Alan's Hobby, Model & RC FAQ Web Links |
RE: At a certain engine RPM my radio gear goes nuts ? Troubleshoot..
All of the above are valid suggestions. In addition you should look for any metal to metal connections that could resonate when your engine reaches certain RPM. I had a plane years ago that would do a snap roll occasionally for no apparent reason. A friend found the metal pushrod to the throttle would contact the crankcase at close to full throttle - slipped a piece of fuel tubing over it and the problem went away!
Phil |
RE: At a certain engine RPM my radio gear goes nuts ? Troubleshoot..
You might also try substituting another receiver, borrow one if necessary just for the test. A cold solder joint or cracked circuit board in the RX could present these symptoms. I'm assuming you have your receiver wrapped in foam rubber or otherwise isolated from the airframe.
Also, it sorta sounds like your prop is out of balance, the number one contributor to excessive airframe vibration. But that's only the proximate cause; you have another issue somewhere--could be metal-to-metal friction, could be corroded contacts, could be intermittent connection of another kind. |
RE: At a certain engine RPM my radio gear goes nuts ? Troubleshoot..
Dont forget the switch harness. The contacts could be vibrating at given harmonic.
Edwin |
RE: At a certain engine RPM my radio gear goes nuts ? Troubleshoot..
you can remove the batteries, receiver, and switch one at a time and hold in your hand while you run it up. Should be able to figure out which is causing the problem.. Bob
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