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Just flown brand new Trex600 LE first flight today. After some minor tweaking of the gyro to stop the tail twitching, i've still got a fairly vigorous oscillation.
I know there's already a thread about shaking in a Trex600, have had a look through it and still can't narrow down the poblem.
First noticed the problem during the first few hovers. Just as the heli get's off the deck it tends to wobble forwards and backwards - not hugely, but enough to set up a slight see saw movement. It tends to correct itself. Headspeed in the hover is about 1900rpm.
When in the hover and the pitch is brought down to land, the wobble starts again. If i flick into idle up 1, the oscillation stops immediately with the higher head speed. However if i punch in full pitch after about 4-5 seconds it starts to shake quite substantially. Reducing the pitch and it stops.
It seems if the pitch is around mid stick (about 5degrees) in fast forward flight - all is good, but if i put in full pitch and fly forwards, a fairly strong forward backword movement of the nose starts.
It appears to be coming from what i can see from the head somewhere. Have read through previous threads and tightened all bolts in the swash control assembly. There's plenty of grease in the head bearings, and they are all assembled correctly. All bearings and parts are brand new. The tracking of the blades appears to be ok.
The engine is new, and running on 1.5 turns open, and is on the rich side, but i don't think that this is the cause. Only one other thing it might be - i checked the pitch on the blades, one blade is about .5 degrees off the other blade throughout the pitch curve. So i'll try and get them exactly the same, and see if this fixes the problem tomorrow.
Just wondering if anyone had experienced the same problems, or has any further ideas?
Cheers,
Gareth.
I know there's already a thread about shaking in a Trex600, have had a look through it and still can't narrow down the poblem.
First noticed the problem during the first few hovers. Just as the heli get's off the deck it tends to wobble forwards and backwards - not hugely, but enough to set up a slight see saw movement. It tends to correct itself. Headspeed in the hover is about 1900rpm.
When in the hover and the pitch is brought down to land, the wobble starts again. If i flick into idle up 1, the oscillation stops immediately with the higher head speed. However if i punch in full pitch after about 4-5 seconds it starts to shake quite substantially. Reducing the pitch and it stops.
It seems if the pitch is around mid stick (about 5degrees) in fast forward flight - all is good, but if i put in full pitch and fly forwards, a fairly strong forward backword movement of the nose starts.
It appears to be coming from what i can see from the head somewhere. Have read through previous threads and tightened all bolts in the swash control assembly. There's plenty of grease in the head bearings, and they are all assembled correctly. All bearings and parts are brand new. The tracking of the blades appears to be ok.
The engine is new, and running on 1.5 turns open, and is on the rich side, but i don't think that this is the cause. Only one other thing it might be - i checked the pitch on the blades, one blade is about .5 degrees off the other blade throughout the pitch curve. So i'll try and get them exactly the same, and see if this fixes the problem tomorrow.
Just wondering if anyone had experienced the same problems, or has any further ideas?
Cheers,
Gareth.
+ 7 x Eddies finest EGS's
x 3
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