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Tail Spin on Take off...some help

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Tail Spin on Take off...some help

Old 01-29-2007, 12:33 AM
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Default Tail Spin on Take off...some help

When i go to take off my tail wants to just whip around in circles...doesnt want to stop either...never used to do this i have had it about 2 months i had to replace some stuff after a decent plant.....*ermem*....a new tail *cough* new head

crash was caused by a distraction but anyway....everything is put back together the same and now it just wants to spin on me....

T-Rex 450 SA
Phoenix 45 esc
Mega 16/3/2
Futaba gy401
tail servo - hs55.....btw i have read about people having problems with them and calling them crap, but so far it has been alright by me
DX7 Spektrum

and i think thats about all that is needed for now....im just trying to get it figured out while i get opinions from better experienced pilots
Old 01-29-2007, 02:39 AM
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Default RE: Tail Spin on Take off...some help

The GY401 should hold it, so totally guesiing here.

Gears stripped in tail servo,
Belt to tail wrong way, tail blades rotating wrong way,
Tailblades incorrect way.
Main rotor pitch too much
Correct gears, main rotor to tail rotor ratio.
tail rotor blade size
incorrect tail blade linkage setup , are blades pitching the correct way.
Old 01-29-2007, 11:28 AM
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Default RE: Tail Spin on Take off...some help

Check your tail drive belt for missing teeth. I had sporatic spining on take off or high power climbs. turned out I had worn a few teeth of in a couple spots on my belt.

The odd this was that it would perform fine in hover and FF, but a high power climb wolud have me fighting for control...Hope it helps
Old 01-29-2007, 12:08 PM
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Default RE: Tail Spin on Take off...some help

Try reversing the tail servo....
Old 01-29-2007, 03:13 PM
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Default RE: Tail Spin on Take off...some help

Give right rudder, it should pull the rod to the front, if thats wrong reverse the rudder.

Pick it up and turn the nose counter clockwise (nose left) looking down from above, again the servo should pull the rod, if thats wrong reverse the gyro switch.

If they are both correct start looking at a drive problem, ie belt twisted too many times, tail rotor spinning the wrong way, missing teeth, the drive pinion slipping on its shaft.
Old 01-29-2007, 10:32 PM
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Default RE: Tail Spin on Take off...some help

got it taken care of....stupid mistake while putting on the new tail rotor...got the belt reversed...guess its easy to overlook

thanks for all your help guys
Old 01-31-2007, 12:49 AM
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Default RE: Tail Spin on Take off...some help

i had the same prob, but for me i had to adjust the pitch, the rudder wasnt spinning fast enough to compensate for the rotational torque.

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