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T-REX 500 › My tail keeps blowing out? (found the problem)
10-20-2009 03:47 AM  8 years agoPost 1
Spitfire1

rrElite Veteran

Perth Australia

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Ive just rebuilt my heli and when I flip it over the tail blows out turning it into a piroflip and Im not good enough for that yet.

Before I rebuilt it used to blow out occasionaly when I did tic tocs, but now it seems to be doing it nearly all the time when ever flip the heli over, on the first flight I did a full collective climbout, the tail held for a while then blew out at 50ft up, the second flight I did a couple of stationary back and side flips and twice the tail completely spun around.

The belt is not tight but I wouldent of thought it was loose enough to slip.

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10-20-2009 03:56 AM  8 years agoPost 2
himaxkeith

rrApprentice

Atlantic City NJ. USA

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What Gyro,tail blades,Tail servo are you running??

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10-20-2009 04:00 AM  8 years agoPost 3
Spitfire1

rrElite Veteran

Perth Australia

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401, 9254 with stock tail blades.

Ive tightened the belt extremely tight, and Im going to hover and see how high I can crank the gain up (I think its at 76% now, maybe I can get up near 100%) but its going to be scary as hell flipping it over and hopeing it doesent go into a piro flip. Damn Ive never had much trouble with tails blowing out in all the time Ive been doing this so far.

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10-20-2009 04:03 AM  8 years agoPost 4
Spitfire1

rrElite Veteran

Perth Australia

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The only other thing I can think about is in the crash one of the wires on my esc was cut, but it still seems to be connected and the heli doesent seem to be cutting out, I dont think so anyway.

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10-20-2009 04:32 AM  8 years agoPost 5
dkshema

rrMaster

Cedar Rapids, IA

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You might want to fix or replace that cut wire. It may have nothing to do with your problem, but could be a big problem on its own.

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

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10-20-2009 04:33 AM  8 years agoPost 6
himaxkeith

rrApprentice

Atlantic City NJ. USA

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It could be something with the 401 after the crash.Or Check the programming of the ESC make sure the governer mode is off that to is known to cause tail issues.I switched my 401 to the 520 gyro never looked back It would hold ok till you really needed it and it would blow out also.

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10-20-2009 04:55 AM  8 years agoPost 7
CompyMike

rrVeteran

sacramento, ca

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disconnect the tail control rod from the tail servo and move the rod parallel with the boom to check for binding. Should be very smooth. To me it seems like you might be having some binding. My heli all of a sudden started blowing out the tail doing big collective moves. It was a bad bearing in the tail grip causing my tail linkage to bind.

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10-20-2009 04:56 AM  8 years agoPost 8
Spitfire1

rrElite Veteran

Perth Australia

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I flew again with a very tight belt and 90% gain, and its like theres not enough tail authority, the tail doesent blow out creeps one way durin 12 degree climbouts, and as soon as I load the blade in a flip or tic toc it blows out completely.

Im going to chech all my setup, but seems odd it wasent doing it before the crash, think Im going to have to try swapping gyros.

Problem is I used my last bit of gyro tape yesterday.

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10-20-2009 05:04 AM  8 years agoPost 9
CompyMike

rrVeteran

sacramento, ca

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Yah I went through two gyros and two servos trying to solve my issue. And it was a mechanical issue. Check for binding before you start trying different gyros.

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10-20-2009 05:20 AM  8 years agoPost 10
Spitfire1

rrElite Veteran

Perth Australia

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^
It seems OK, nice and smooth. Its odd as I would of thought if the gyro was faulty it would drift in a hover, but it only drifts in a climbout and blows out under hard collective (allthough I woudent call a sideways flip hard) which tells me its mechanical.

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10-20-2009 05:32 AM  8 years agoPost 11
Spitfire1

rrElite Veteran

Perth Australia

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One positive to come out of this is Ive never been couragous enough to try a piroflip with my real heli, only on the sim.

After being forced to gather it up a few times now after an uncontrolled piro Im feeling a bit more confident I may be able to try one when I get this sorted.

Im sure if I had not been trying piroflips on the sim Im sure I would of crashed as soon as the tail let go.

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10-20-2009 10:02 PM  8 years agoPost 12
Richardmid1

rrProfessor

Leeds, England

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Sounds like a tail glitch caused by interference getting to the gyro or tail servo. Any chance you stripped the gears in the 9254 in the crash? Other than that make sure your still getting full pitch on the tail both ways.

60% of the time, it works every time!

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10-21-2009 01:48 AM  8 years agoPost 13
Spitfire1

rrElite Veteran

Perth Australia

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I dont think its a glitch as its not random, I can make it happen on demand by simply loading up the rotor with a flip, my servo is moveing OK and feels good but maybe I should take it apart and look, if this different gyro doesent help thats what Il do next.

EDIT. good news as far as my expensive gyro is OK, bad news now Im back to square one with no clue why its blowing out, Il take the servo apart next.

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10-21-2009 04:48 AM  8 years agoPost 14
Spitfire1

rrElite Veteran

Perth Australia

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When I feel the belt it feels quite loose but then when I turn the blades it gets tight, is this normal

Would the belt loose cause the tail to blow out? wouldent I hear it in the air if the belt was slipping?

If I turn the main blades and hold the tail rotor it doesent slip, I would not of thought it to be loose enough to slip in flight.

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10-21-2009 06:00 AM  8 years agoPost 15
outhouse

rrVeteran

auburn ca

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500 likes a tight belt.

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10-21-2009 06:12 AM  8 years agoPost 16
Spitfire1

rrElite Veteran

Perth Australia

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Its wierd its tight, and then I turn the blades and its loose, move the blades sometimes its loose and sometimes its tight.

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10-21-2009 06:14 AM  8 years agoPost 17
Spitfire1

rrElite Veteran

Perth Australia

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When I move the blades around the belt goes from very tight to very loose.

EDit. Ive managed to get the belt really tight, cant see it makeing any difference, just have to give it a try. Also managed to get the tail rotor hub further out on the shaft, but thats only given me more left travel which I can see makeing any difference either, if it was more right travel maybe but not left, then again I cant rememember which way its blowing out, I think its when Im inverted on negative pitch so maybe more left will help, not sure.

IM also useing 980 kv motor with a 22 tooth pinion, but I cant feel it bogging and I was useing it before with no probs, maybe 10 flights with no tail blowouts, my belt is so tight now I can feel its placeing some drag on the system, I hope it doesent bog the motor and make it worse.

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10-21-2009 08:31 AM  8 years agoPost 18
himaxkeith

rrApprentice

Atlantic City NJ. USA

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Something is wrong if the belt is tight then goes loose. Sounds like one of your shafts is bent front or back. Could you see if one of the pulleys is wobbling when you turn the head. The belt should be snug but not screaming tight just puts more load on the motor if its too tight

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10-21-2009 09:23 AM  8 years agoPost 19
Spitfire1

rrElite Veteran

Perth Australia

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I think I may be on to something.

My tail blades were on the correct way and everthing was correct, but instead of thetailgrip control joints being on the trailing edge they were on forward faceing, now that Ive reversed them the tail pitch slider moves right to give me right pitch where as before it was going left to give me right pitch and vise versa, with it the correct way I have alot more travel than before, I will test fly tommorow when the wind dies.

Ive also loosened the belt back to the way it was, you should not need to have a belt so tight that is stops the blades I dont think.

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10-21-2009 09:29 AM  8 years agoPost 20
Gyronut

rrProfessor

Martinsville In.

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Are you running 5S or 6...???

Rick

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T-REX 500 › My tail keeps blowing out? (found the problem)
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