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Other › Novice needs some help!
10-24-2004 09:57 PM  13 years agoPost 1
skyshark

rrNovice

Big Island of Hawaii

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I took my Voyager E out for it's first flight this morning and was disappointed to find that the tail started wobbling back and forth violently at about half throttle. Of course I didn't want to attempt a hover with this problem. I'm using a Futaba GY401 gyro that seemed to be operating as I expected. I live on an Island, so I don't have any local people to help me out.

Any ideas on what could be causing this problem and how to correct it?


-Ken

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10-24-2004 10:24 PM  13 years agoPost 2
Ralphw

rrKey Veteran

Spring, TX

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OK. first question...is the oscillation just a left to right type of movement or is it a wobble (think front to rear and side to side all at the same time)?? If it's a wobble, you need a higher headspeed as this movement is common on the VE when the headspeed is below approx 1300 rpm.

The best way to avoid that is to run a throttle curve that lets the motor run at high rpm and flying using primarily pitch. If you are using a brushless setup, many of the ESC's have a 'gov" mode to help.

If you're using the stock set-up and motor, then make your throttle curve in "Normal" look something like this...0% - 25% - 95% - 95% - 100%. I keep my Idle-up switches set for a flat 95% at all points. I spool up using Normal and then switch to Idle-Up 1 or 2 for flying.

If the movement is a hard side to side wag only. then you may want to check/reduce your gyro gain settings.

Ralph W.
"Life's Short, Fly Fast"

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11-01-2004 10:42 PM  13 years agoPost 3
skyshark

rrNovice

Big Island of Hawaii

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Thanks for all your help

I moved the gyro to the back of the Heli on a platform that I built. I guess the Hacker motor was causing the gyro to behave strangely.

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11-02-2004 12:28 AM  13 years agoPost 4
Ralphw

rrKey Veteran

Spring, TX

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That'll do it. For some reason the Futaba 240 and the 401 are really sensitive to the EMI from the brushless motor and ESC. I had to move mine as well but I didn't think about that one as an issue when I replied.

If you have any trouble with your mount for the gyro, a large diameter servo wheel with the center nub ground off works great when attached to the base of the anti-rotation link behind the head.

Ralph W.
"Life's Short, Fly Fast"

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