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T-REX 450 › 450 SA Spins
08-11-2007 06:06 PM  10 years agoPost 1
Mike1

rrNovice

Indianapolis, IN

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Does anyone else have this ord had this problem with there 450SA. I am running a 401 on the tail it is set up right but the problem is as I start to advane on the throttle the helicopter just wants to spin as the blades speed up. I have double checked everything for the proper direction it just wants to spin.

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08-11-2007 06:09 PM  10 years agoPost 2
arffy

rrApprentice

Ny

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Fast or slow.Fast spin where it spis out of control check your gyro direction and if it's a slow spin maybe too slow headspeed.

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08-11-2007 06:13 PM  10 years agoPost 3
Mike1

rrNovice

Indianapolis, IN

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the gyro is in the right direction and yes it is a fast spin at midstick I have never seen anything like this before. and when I correct this with a rudder input to give right rudder the tail rotor really slows the belt tension is good. Now I am just at a loss

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08-11-2007 09:14 PM  10 years agoPost 4
martinhoyle

rrNovice

Birmingham UK

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You have mounted it the right way up ?

Monday I bought a Protech NT-410 and mounted it like a GY401 only to realise after 2hrs and a visit to my LMS that I should have mounted it edge on (the instructions didn't show clearly how to mount it, that's germans for you )

It's not clever having the gyro and tail responding to fore and aft cyclic
Martin

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08-11-2007 09:18 PM  10 years agoPost 5
philthewrench

rrApprentice

Westchester Co. NY

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Are the main blades spinning in the correct direction?

Phil

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08-11-2007 09:42 PM  10 years agoPost 6
dkshema

rrMaster

Cedar Rapids, IA

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Tail rotor turns counter clockwise, looking at the right side of the heli, nose to your right, tail to your left.

The leading edge of the TR blade going down should be down, the leading edge on the TR blade going up should be up. Tail rotor control links are on the leading edge of the blade grip.

Right rudder command causes the TR servo to PULL the pushrod FORWARD, toward the nose. If it goes the other way, reverse the RUDDER channel at the transmitter.

Pick up the heli, turn the nose to the LEFT while watching the TR servo. The servo must PULL the pushrod FORWARD when you turn the nose of the heli to the left. If it doesn't, REVERSE the GYRO.

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Make sure you didn't get an extra twist in the TR belt. It only needs to make a 90 degree turn going down the tube.

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I assume you set the 401 up correctly and are initializing it in heading hold mode. I also assume that you set the TR mechanics up properly. If you didn't or can't, that's a problem.

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If all is OK to this point, then suspect a pulley slipping on the shaft at either the front or rear end of the belt. The pulleys have been known to slip on their shafts.

-----
Dave

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

Team Heliproz

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08-12-2007 04:52 AM  10 years agoPost 7
pumba15t2f

rrNovice

Medina Ohio

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I know it states that you checked the Gyro, but that sure sounds like a reversed gyro. I would double check anyways and reverse it to see if the problem goes away.

No S**t, there I was, Inverted with a slingload, Airmedals dangling

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