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HelicopterTurbine Helicopters › Jetcopter wobbels
09-05-2003 03:29 AM  14 years agoPost 1
dperry

rrApprentice

Oklahoma City, OK

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My Vario Jetcopter has started wobbeling (left to right) and does not do it all of the time.

If I am in fwd flight it is smooth and on a decending hover it is smooth but if I bring it into a hover the wobbels appear.

No blade or heli dammage.

Joseph, thought the O-Rings might be dry, adding oil (tri flow) has helped some but heli still shakes. Have swapped blades, no difference, blades balance ok, flybar & paddels are straight.

I have tryed playing with the pitch curve but that has mades no difference.

??

Don

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09-05-2003 05:19 AM  14 years agoPost 2
heliVoY

rrVeteran

NJ

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I had a wobble untill i used the harder O-rings. I later changed to the 1400 rpm and that was smooth.

I would also check your tail drive shaft, as i had one that was not 100% true, and it caused some vibration.

Also, check the main shaft of the HP5, the original shafts are not made from hardened steek and can bend ... this would make sense with your symptoms, as when you have little cyclic input, the shaft would cause a wobble, upon cyclic input (such as forward flight), the pitch difernece between the oposing blade grips forces more of a dampening evect on the orings, calming the wobble ... I was able to bend my original shadt by hand ! it was very soft ! now i have it replaced with a hardened steel one. I am converting to 12mm for a multiblade head in another HP5, and i have a 3rd on which i will replace the shaft in before i even run it ...


brg,


Wojtek

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09-07-2003 04:28 AM  14 years agoPost 3
dperry

rrApprentice

Oklahoma City, OK

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wobble

It was the O-rings they had worn a flat spot so I turned them over and test flew the wobble was gone!

I will order some more o-rings on monday

Don

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09-07-2003 06:44 AM  14 years agoPost 4
heliVoY

rrVeteran

NJ

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Don,

order a set of the harder O-rings ... if you have not tried them yet, they will make the jetcopter a bit more responsive ..

Wojtek

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HelicopterTurbine Helicopters › Jetcopter wobbels
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