Servo Jitter
08-02-2004, 06:57 AM
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Servo Jitter
I just picked up a new plane - a Fun One - 40 sized Sport It looked good, and was built well.
The first day at the field I went through all of the preflights - No problems.
As I was tuning the engine I noticed the right aileron was Jittery, with 1/2-3/4" of uncontrolled movement. This was only happening when the engine got up to 7500 rpm and above.
Not wanting to loose the plane on it's maiden flight I when home to look for answers. After much head scratching I noticed that the Throttle cable (wire) was in contact with the side of the cylinder. I theorized that it was picking up static and working like an antenna which interfered with the closest servo.
To solve this; I added a ball linkage to the throttle arm - which now gave me a 1/8" separation between the Engine and the cable.
The next day the jitter was gone and I had some great flying!
Happy Landings;
Bruce
The first day at the field I went through all of the preflights - No problems.
As I was tuning the engine I noticed the right aileron was Jittery, with 1/2-3/4" of uncontrolled movement. This was only happening when the engine got up to 7500 rpm and above.
Not wanting to loose the plane on it's maiden flight I when home to look for answers. After much head scratching I noticed that the Throttle cable (wire) was in contact with the side of the cylinder. I theorized that it was picking up static and working like an antenna which interfered with the closest servo.
To solve this; I added a ball linkage to the throttle arm - which now gave me a 1/8" separation between the Engine and the cable.
The next day the jitter was gone and I had some great flying!
Happy Landings;
Bruce
08-02-2004, 02:34 PM
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RE: Servo Jitter
one thing though electricity doesn't exactly conduct plastic unless you have some of those really heavy duty servo arms. you could of also just made a ground to it
08-09-2004, 10:16 PM
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RE: Servo Jitter
It's a classic case of metal-to-metal contact causing interference on your radio. It's something I always look for before I fly a new plane. You did the smart thing by not flying and investigating the cause.
08-10-2004, 09:09 AM
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RE: Servo Jitter
ORIGINAL: LVsRCMH
It's a classic case of metal-to-metal contact causing interference on your radio. It's something I always look for before I fly a new plane. You did the smart thing by not flying and investigating the cause.
It's a classic case of metal-to-metal contact causing interference on your radio. It's something I always look for before I fly a new plane. You did the smart thing by not flying and investigating the cause.
ROGER THAT!!!
