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HomeAircraftHelicopterHelicopter Main Discussion › Pinion too "Tight?"
10-14-2010 04:47 PM  8 years agoPost 1
surferguy

rrApprentice

Buxton, NC USA

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Yo yo yo,

Got some bad*ss tail kick to the left when I spool up. Noticably more when I pump the throttle. I tightened the belt, and was looking at the pinion on my scorpian motor. Looks like it might be a little tight up against the main gear.

Would this cause some ramdom kicky sh*t to the tail?

JD

Trex 700 V3, TRex 500, Blade 130x, Blade Mcpx

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10-14-2010 04:52 PM  8 years agoPost 2
chopper_crazy

rrElite Veteran

Delphos, Ohio

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sounds like more of a gyro gain issue.
As far as pinion tightness, put a piece of notebook paper between the gear and the pinion and then tighten them up. this will give you the perfect gear mesh.

It's a complex, costly, glow powered anti-gravity machine!

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10-14-2010 04:59 PM  8 years agoPost 3
surferguy

rrApprentice

Buxton, NC USA

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I have a GY401 on there and my buddy said ahh lets turn it up some. So we turned it up to like 85%.

Since then its been the same.

Ive also tryed to turn it down to 75% and even
up to 95%.

hmmm

Trex 700 V3, TRex 500, Blade 130x, Blade Mcpx

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10-14-2010 05:05 PM  8 years agoPost 4
GyroFreak

rrProfessor

Orlando Florida ...28N 81W

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Mine is around 30%, but a lot depends on the mechanical configuration of the tail pitch control setup.

I think about the hereafter. I go somewhere to get something, then wonder what I'm here after ?

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10-17-2010 09:02 AM  8 years agoPost 5
ChristianM

rrVeteran

Oslo, Norway

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Too tight gear mesh will cause very high frequency vibration which can cause the gyro to perform poorly. I had an issue on my TRex 450 with VBar and it would twitch. I played with the gain without much success but after I loosened the gear mesh then it was smooth as glass and all problems went away. I would definitely try loosening the gear mesh to see if it helps.

Christian

Burn fuel, be happy

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10-17-2010 10:56 PM  8 years agoPost 6
billiano

rrVeteran

Greece ,Patras

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If you pump the pitch and the tail kicks left it seems that you have too much of proportion or in our case since 401 is not that complicated
you have added REVOLUTION MIX.
So cancel it.
Or second case your batteries are not enough(I mean mAh or Volts) or your pitch is over the needed one(and the full pitch instantly is reluctant) and the tail brakes that equality by turning left since the main rotor's rpm decrease.
Or third case you must check your tail's subtrim.
Because the servo is drifting.
Please let us know for your troubleshooting

Esprit Model Flight Team
Kasama Srimok 90N FBL
TDR Rigid 90

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10-18-2010 01:18 AM  8 years agoPost 7
WATCH-THIS!

rrVeteran

NW Michigan. Rotor Rebels

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One too many twist in the belt

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10-19-2010 09:01 PM  8 years agoPost 8
chopper_crazy

rrElite Veteran

Delphos, Ohio

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would a twist in the belt cause something like this?

It's a complex, costly, glow powered anti-gravity machine!

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10-20-2010 01:52 AM  8 years agoPost 9
rilopez825

rrVeteran

Pembroke Pines, FL

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A twist in the belt would probably be heard as it rubs against itself. If you ignorerd the sound of it then yes it would cause a crash as it would over heat and break. I doubt this was the case as he didn't meantion the belt snapping. The gear mesh shouldn't cause this you would either had stripped the gear or heard the motor struggling before it lifted the Heli. I think inproper tail setup.

Maybe sub trim or the gyro armed as you had right input on the remote as you turned on the receiver.

Richard

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10-20-2010 01:58 AM  8 years agoPost 10
Justin Stuart (RIP)

rrMaster

Plano, Texas

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You're saying it was kicking to the left? If the gyro gain was too high, you'd get wobble both directions. If the belt was loose, you'd be kicking right. How about a binding pitch slider?

Avant RC
Scorpion Power Systems
Thunder Power RC
Kontronik Drives

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10-20-2010 12:50 PM  8 years agoPost 11
WATCH-THIS!

rrVeteran

NW Michigan. Rotor Rebels

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The wrong twist in the belt-- making the tail rotors spin the wrong direction?

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