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-   -   Unwanted interference mix (http://www.Wattflyer.com/forums/showthread.php?t=68901)

Dave180 12-04-2012 05:55 AM

Unwanted interference mix
 
Hi. I have a weird problem with my radio. I've been flying off and on since the '80's. I have an AMA 1991 gold label FM World engines Expert radio which has worked great till now. Currently, I'm flying a HOB Super Decathlon converted to electric.(10 years old) Everything works ok on the pre-flight ground check. I handlauch as it has a glider skid on it. It climbs great and flys great.

Here is the problem: At altitude, If I pull back more then 1/2 way on the stick, it immediately snap rolls to the right. It does it every time. Even with the motor turned off at speed. Less then 1/2 way, its just fine. Its like its a controlled mix. Its crazy.. I won't be flying it again till I figure this out. Actually I've done 3 flights with it like this. No more flights.

Any ideas of what could be causing this???

rcers 12-04-2012 01:41 PM

Yes - it is too much elevator control deflection. How much does the elevator surface move?

Dave180 12-04-2012 04:07 PM

Thanks for the reply. It moves 5/8" at full throw. I turned down the dual rate adjustment so its like 3/8" now. Somehow I don't remember it doing this before but its been awhile.

rcers 12-04-2012 04:36 PM

Give that a shot - many airplanes will do a high speed snap with too much elevator.

Mike

newjak 12-04-2012 05:22 PM

I'd also take a look at the structural integrity of the horizontal stab and the elevator itself. You said the plane is old. Some glue joints may have worked there way loose.


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