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HelicopterBeginners Corner › Tail Wag When Starting to lift off
10-22-2004 07:30 AM  13 years agoPost 1
OnFiRe705

rrApprentice

Southbury CT

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Ok....been pretty fustrating, but i finally figured out why my tail goes erradic. I have a rappy 30 with 9chp, 401/9254 combo, tt39 and tail mounted rudder servo. The break in with the motor is complete and have about 6 tanks of fuel through it. When i start to take off, the tail needs a lil correction due to still needing a lil trim corrections. Not bad, but correctible. As soon as i barely get the skids about 1/2 inch off the ground, the tail wags left...right...back and fourth till it starts spinning. I checked the belt to make sure it was twisted right, and checked the blades to make sure they are right. No problems except that i noticed when i grabbed both tail blades in a fist, i can move the whole shaft left and right about a 1/4 inch. To me being a HH-60 Helo Mech, i would say that the gear that the belt turns needs some shimming so it doesnt move back an forth. Was Really wondering if anybody had any problems with there 30 rappy and or what to do to correct it. Im goint to rebuild starting from scratch the tail assy. to make sure i didnt goof anything. My gyro is also set up correctly....def sure theres no probs with that. Any help would be great. THANKS!!!

It takes a high school education to fix em but a college degree to break em

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10-22-2004 07:40 AM  13 years agoPost 2
Saint728

rrProfessor

Honolulu, Hawaii

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No problems except that i noticed when i grabbed both tail blades in a fist, i can move the whole shaft left and right about a 1/4 inch. To me being a HH-60 Helo Mech, i would say that the gear that the belt turns needs some shimming so it doesnt move back an forth.
The problem with your tail being able to slide back and forth 1/4 inch is because the tail belt gear is put together wrong. You need to take the tail box apart and pull off the gear. Then pull the two sides of the gear apart and flip the right side over and put it back together. When you look at the gear both sides should have a slight curve towards the inside of the gear. Right now if you look at it carfully you will see that the left side of the gear is curved and the right side is straight.

Take Care,
Cheers, Patrick

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10-22-2004 01:03 PM  13 years agoPost 3
spongebob1871

rrApprentice

Yokota Air Base,​Japan

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i'm having the same problem, and it's really blowing my mind.

i put everything back together correctly, and it's still spinning around after i get light on the skids. any other possiblities? i've went through the whole heli and cannot find anything out of place.

finally......i can fly!

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10-22-2004 01:32 PM  13 years agoPost 4
Saint728

rrProfessor

Honolulu, Hawaii

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If yours is spinning around then it could be you have the gyro in reverse? Try clicking the reverse switch on the gyro and see if it helps?

Take Care,
Cheers, Patrick

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10-22-2004 02:09 PM  13 years agoPost 5
z11355

rrMaster

New England

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Patrick is correct.

the '1/4" of movement' problem is because
the red tail gear is assembled backwards.
The separate red flange piece for the gear
is VERY easy to install backwards and that
is causing the slop. Disassemble and do it
correctly. When correct, there is no movement.

the 'spins when light on the skids' indicates
that gyro (and/or servo) needs to be reversed
(electronically).

first, verify the servo movement:
on the transmitter, push the tail control to the
right. you should see the control rod being
pulled forward and the TRAILING edge of the
tail blades move to the right. If not (ie. rod
gets pushed back; reverse tail servo in transmitter).

second, verify gyro movement:
stand to the left side of the Raptor, pick it up and
yank it toward you (ie. nose moves right/clockwise). you should see the gyro force the
control rod BACKWARDS toward the tail. If not,
reverse the gyro (the tiny switch on the 401 labelled REV)

So what should happen is that you've simulated
a 'go right' command and the gyro SHOULD
be counteracting it and NOT amplifying it.

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10-23-2004 08:00 AM  13 years agoPost 6
OnFiRe705

rrApprentice

Southbury CT

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Thanks all for your posts. It dawned on me to pull the tail apart and look at how i had the gear put together....and saint was right. I tore it all apart and made sure that the beveled sides were facing in and that fixed most the problem...no more slop. I tinkered with the gyro a lil more and turned down the gain on my controller and that fixed it all. I finally started doing some ground movements. Again thanks to all!!!!

It takes a high school education to fix em but a college degree to break em

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