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11-23-2006 04:12 AM  11 years agoPost 1
jhamlinjr

rrKey Veteran

Milledgeville, GA, United States

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My tail is bouncing on my 450se. When new gryo mounted. had tail wag which I corrected with gain adjustment. Now tail is bouncing up and down. Seems worse at lower head speed. Still flyable. Is the pinion supposed to be flush with post on motor? I noticed it is sitting slightly below end of shaft. Think still need to tinker with gyro? Also belt seems to be wearing on sides prematurely. Maybe the tail shaft or shaft at other end of belt. Havent run into this problem yet. Please any advice would appreciated!

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11-23-2006 04:40 AM  11 years agoPost 2
slider46

rrProfessor

Ocala Florida

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What gyro? What settings are you using for the gyro? Have crashed the heli reciently? Need a little more info....

Tom..... No "D" flying....

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11-23-2006 04:49 AM  11 years agoPost 3
DinSum

rrNovice

London, Ontario

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dunno if this has anything to do with it but make sure your tail blades are the same weight.

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11-23-2006 04:57 AM  11 years agoPost 4
jhamlinjr

rrKey Veteran

Milledgeville, GA, United States

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Did have a crash.Replaced feathering shaft, main shaft, and blades. Blade tracking good. Heli flying great other than tail bounce. Using Futaba G190 until Eflite returns my original one from being repaired. Dont know if gear mesh is set correctly due to pinion placement seems like should be flush with motor shaft. Maybe moved during crash. Is the gyro Im using not enough for Trex?

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11-23-2006 05:18 AM  11 years agoPost 5
DinSum

rrNovice

London, Ontario

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Im not sure if the gyro is good or not for the t-rex, but I can tell you this, I have a pimped out t-rex se and my favourite part on it is the gy401 gyro from futaba. It seams as though it is what helped my heli fly better then any other part i have upgraded.

Have you checked to see if your tail boom is still straight after the crash?

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11-23-2006 05:56 AM  11 years agoPost 6
jhamlinjr

rrKey Veteran

Milledgeville, GA, United States

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Tail boom is straight. Eflite gyro was one recomended by lhs. Has headlock. Would like a Futaba gyro but funds not availible right now. Eflite works great for what I do which is basic sport flying. Still learning. Im sure Ill step up as needed. What is normal life on the belt. Still wondering about tail bounce and pinion location. Keep in mind right now using the Futaba gyro which is pure rate gyro.

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11-27-2006 08:41 PM  11 years agoPost 7
ktm520

rrNovice

newburgh, in

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i've been doing some research on this as my se started doing this when i lowered the head speed. there are a couple of different things that could cause it. blade grip tightness, too much/ not enough head damping depend on headspeed, tail blade grip tightness. this is assuming that nothing is bent and the blades are balanced. i would play with your head damping and blade grip tightness. i put new orings in my head and it didn't eliminate the bounce. i'm going to work with the blade grip tightness next.

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11-27-2006 09:48 PM  11 years agoPost 8
marlin847

rrApprentice

Pelion SC USA

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went to a field this past weekend and the was a team pilot for allign there. His and my SE both had the bounce at low speeds he said it is normal just raise the head speed up 0/35/65/85/100 in normal and 100 across the board for idle 1/2 it what he is running and i am running. Just trying to help. Marlin

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11-28-2006 12:09 AM  11 years agoPost 9
BikeNBoatN

rrVeteran

Santa Ana, CA USA

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0/35/65/85/100 in normal
If your Normal throttle curve was lower than that before, then that's definitely the cause of your bobbing. The headspeed is way too low at anything less than 3/4 stick. I have my Normal curve set to about 0,85,90,95,100 to keep the headspeed up. Since I fly in Idle-up only and use Normal just to spool up, that hasn't been a big problem for me. But if you're flying in Normal, try bumping your throttle curve way up and see how it improves flying characteristics.

Brent
Slow and Smooth 2-D Scale Flyer
AMA #35431

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11-28-2006 12:28 AM  11 years agoPost 10
rickc

rrElite Veteran

Creve Coeur IL. (Peoria Area)

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Make sure you are not over tightening your mainblades.

Rick

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11-28-2006 02:24 AM  11 years agoPost 11
JYRiker

rrApprentice

Maryland - USA

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I just dealt with the same thing and tested and fixed my scenario this weekend.

I also had a crash and had been slowly testing and repairing things till I had a perfect hover, but when I gunned it, I got the tail bounce up and down ( had replaced main shaft, feather shaft, purchased the red dampers,).

I actually did a few corrections.. used SAB blades although this would not do it ( it's my first set of CF blades, still salavating :P ), adjusted the the feathering shaft ( tightness and made sure everything look centered and symatrical ), but the correction I did, that I think fixed it was replacing the tail shaft. In my last accident I remembered that both tail blades were destroyed, but I never replaced because I didn't notice any vibration issues. When I removed the old one, I rolled it on glass but did not notice any bends ( but I wear glasses, so who knows :P ).

If you haven't replaced the tail shaft, try it and see if that helps...

Johnny

HeliUp Frame Trex 450
CF Trex 600
CF Trex 500

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11-28-2006 02:36 AM  11 years agoPost 12
Stork

rrNovice

Pawnee Rock, Ks USA

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Usually an up and down tail bounce means the tail rotor is out of balance, or the tail shaft is bent.

At low frequency side to side wiggle/shake usually indicates a head problem. A high frequency side to side wiggle/shake indicates a engine/motor problem.

A kink in your tail drive belt will cause the bounce also.

Hope this helps.

Clay

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12-02-2006 06:03 PM  11 years agoPost 13
ktm520

rrNovice

newburgh, in

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i fixed my tail bob by loosen the blade grips. i had them tight enough that they wouldn't fold under their own weight if you hold the heli on its side with the blades point fwd/aft. i loosened them up quite abit and the bob is completely gone. i am running low headspeed.

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12-03-2006 02:29 AM  11 years agoPost 14
jhamlinjr

rrKey Veteran

Milledgeville, GA, United States

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Thanks! Thats about the only thing I didnt replace cause it didnt look bent but I have come to relize that you cant always see it with the naked eye.

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