hi guys,

ok,,,last week i was trying to hover. my bird went up nice and smooth and straight. but then it started to drift and i lost it into a fence. i broke 1 main blade grip,1 tail grip and the tail fin. so i replaced all of those. today i tried to hover again. but as she went up only about 10 inches or so it would start to spin very fast in one spot. no matter what stick input i tried it still would spin,,counter clockwise i think.. after a few more attemps i came down hard and broke the tail yoke.

has anyone had this spinning problem and what did you do to fix it? like i said last week it went up real nice except for the natural drifting... one thing i did notice when i brought it home was i had the tail gear on a little bit crooked. this is because i needed to losen it when i replaced the tail fin. could that maybe have been the problem?

i'll take any and all advise,,,thx,,,,jake.

It sounds like your tail pulley is loose. A counterclockwise spin indicates that your tail rotor isn't providing enough thrust to do its job, which could be caused by the pulley slipping on the tail shaft. Is it a metal or plastic pulley?

it is a plastic gear... the gear was little crooked.. what i mean by thatis the whole unit that slides on to the boom was alittle crooked..not much,,just a hair... could that cause the spinning?? thx,,

come on guys,,,, 14 people read this post and only one was kind enough to try and help.. i thought this is what these forums arehere for.. any help????? please!!!!

It's only been two hours since your first post and it's late night/early morning for a lot of people. Try to have a little patience. Speaking of late night, I've PMed you one more time and that'll do it for me for the evening.

basic information like.... WHAT HELI IS IT? would help others give you some advise.

even without that you obviously don't have rudder control. check and make sure the gyro is working, the rudder servo hasn't been moved, the rudder servo is still plugged into the gyro and gyro plugged into the receiver, make sure the belt tension is correct and it's not slipping on a gear (at the tail or at the front), make sure the rudder servo hasn't had it's gears stripped ...etc.

What if they didn't know the answer ... is that the kind of answers you're looking for??

Here's some help. Learn what it takes to control YAW on a heli. Then start figuring out whether your heli is lacking in any of those areas.

YAW is controlled by sufficient tail rotor authority to control/manage YAW.

Tail rotor authority is derived from rotor RPM, blade size (and correct installation), and blade pitch.

RPM comes from the drive system ... it has to work. For starters, main rotor headspeed has to be sufficient to produce sufficient tail rotor authority (RPM). Is your headspeed sufficient?? Then, as others has mentioned, check for drive train slippage (loose belt, slipping pulleys, etc). This will suck RPMs from from the tail rotor and it seems at times to be intermittant or inconsistant.

Pitch: Determined by mechanical setup/trim, rudder stick position, gyro setup, servo. As you can see, there's a magnitude of things that can go wrong here. If the "uncontrollableness" is always there then it could be in this area. If it's intermittant, then I'd check in the drive train area ... but wouldn't count out a failure in this area.

Blade size / installation: You said you crashed ... right? Many times beginners replace broken parts incorrectly (blades on backwards, rotor spinning backwards, blade gripes backwards, etc). Didn't you say you replaced a tail grip?? Go through this ... ensure this is correct.

As you can see ... this "info" can be applied to practically all helis with a tail rotor. It's because they all have to control YAW in some fashion our another.

Check the tail rotor timing belt drive pulley on the front end. They have been known to come loose on the shaft. Hold your tail rotor blade and turn the main rotor to detect any slippage.