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All Forums >> RC Helicopters >> Electric RC Helis >> T-Rex heli >> TREX 450 just spins
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TREX 450 just spins - 7/29/2008 3:52:39 AM   
69 roadrunner


 

Posts: 246
Joined: 3/22/2006
From: mt shasta, CA, USA
Status: offline 		My trex 450 ust spins clock wise I have a 401 gyro checked over everything and cant get it to fly. It has been in the air before ust want to pull out my hair please help. thanks steve
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RE: TREX 450 just spins - 7/29/2008 4:21:04 AM   
Flying Foot Doc


 

Posts: 346
Joined: 7/11/2002
From: Jupiter, FL, USA
Status: offline 		Check to see if the gear for the tail belt can spin on the shaft whenyou rotate the tail blades by hand. If it does spin, as mine did, you have to change the tail drive gear assembly. Good luck, Let us know if that helps, Doc

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RE: TREX 450 just spins - 7/29/2008 4:33:48 AM   
69 roadrunner


 

Posts: 246
Joined: 3/22/2006
From: mt shasta, CA, USA
Status: offline 		I checked it and it was spinning replaced and still spins this all started after a crash not very bad crash but a crash.

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RE: TREX 450 just spins - 7/29/2008 4:40:39 AM   
[]TEX[]



Posts: 9600
Joined: 6/27/2006
From: Glencoe, IL, USA
Status: offline
quote:

ORIGINAL: Flying Foot Doc

Check to see if the gear for the tail belt can spin on the shaft whenyou rotate the tail blades by hand. If it does spin, as mine did, you have to change the tail drive gear assembly. Good luck, Let us know if that helps, Doc

If it was spinning counter clock wise it would be the belt.

Check to make sure you didn't reverse the gyro by accident.

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RE: TREX 450 just spins - 7/29/2008 5:11:27 AM   
69 roadrunner


 

Posts: 246
Joined: 3/22/2006
From: mt shasta, CA, USA
Status: offline 		Iam sorry it does spin counter clock wise

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RE: TREX 450 just spins - 7/29/2008 5:30:03 AM   
69 roadrunner


 

Posts: 246
Joined: 3/22/2006
From: mt shasta, CA, USA
Status: offline 		should the tail blades turn clock wise or counter clock wise thanks steve

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RE: TREX 450 just spins - 7/29/2008 6:20:59 AM   
[]TEX[]



Posts: 9600
Joined: 6/27/2006
From: Glencoe, IL, USA
Status: offline 		facing the tail rotor, counter clock wise.

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RE: TREX 450 just spins - 8/5/2008 2:36:51 AM   
awburris


 

Posts: 7
Joined: 8/19/2007
From: Mocksville, NC, USA
Status: offline 		With the main blades are spinning clockwise, the tail blades should spin up into the downdraft of the main blades.

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RE: TREX 450 just spins - 8/8/2008 4:44:42 AM   
goldslinger


 

Posts: 1240
Joined: 5/3/2007
From: GARDEN CITY, KS, USA
Status: offline 		The rear rotor pulley is slipping on the shaft. Grab the main gear so it can't spin and try to turn the rear rotor, if it turns, the pulley is slipping; either the rear or front one.

This can happen after a crash. Use Red locktite to cure it.

Gary

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RE: TREX 450 just spins - 8/18/2008 8:56:31 PM   
69 roadrunner


 

Posts: 246
Joined: 3/22/2006
From: mt shasta, CA, USA
Status: offline 		I need help.. The gear that the belt goes around on the front of heli just spins on shaft I heard they was a metal upgrade cant seem to find anyplace to buy one. I cant evan find a stock one anyhelp would be great. thanks steve

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RE: TREX 450 just spins - 8/21/2008 5:30:00 AM   
mal216


 

Posts: 34
Joined: 6/22/2008
From: Grenada, MS, USA
Status: offline 		Is your servo moving all the way one way? If so, you might have a bad servo. How about the gyro/rudder settings in you transmitter? I had to set, check and set again my settings after just about every flight.

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RE: TREX 450 just spins - 8/21/2008 2:42:58 PM   
hfenn


 

Posts: 570
Joined: 1/1/2003
From: BARNWELL, SC, USA
Status: offline
quote:

ORIGINAL: 69 roadrunner

I need help.. The gear that the belt goes around on the front of heli just spins on shaft I heard they was a metal upgrade cant seem to find anyplace to buy one. I cant evan find a stock one anyhelp would be great. thanks steve


http://www.helidirect.com/product_info.php?cPath=30_295_296_300&products_id=330

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RE: TREX 450 just spins - 8/21/2008 5:40:03 PM   
soul


 

Posts: 57
Joined: 12/12/2007
From: San Jose, CA, USA
Status: offline
quote:

ORIGINAL: 69 roadrunner

My trex 450 ust spins clock wise I have a 401 gyro checked over everything and cant get it to fly. It has been in the air before ust want to pull out my hair please help. thanks steve


I faced similar problem sometime back, basically grub screw holding the tail slider mechanism could be loose. The problem is not easily seen during prechecks, as the tail pitch seem to work when the heli is not under forces . But after lift of the tail simply cannot hold as the tail hub keeps on slipping along with the slider.

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RE: TREX 450 just spins - 9/2/2008 3:04:51 AM   
helifan06



Posts: 634
Joined: 12/11/2006
From: Warren, NJ, USA
Status: offline 		with the heli nose to your right and the heli tail to your left; the tail rotor should spin counter clockwise. Also, make sure the direction on your GY401 is set properly, you can check that by holding the tail and move it towards you; the tail pulley should move away from you. If you move the tail away from you; the tail pulley should move towards you.

Attached is the link to bob white 401 gyro setup. It was very helpful when I built my TREX, also, it is always good to change your tail servo to a digital fast response one, I didn't do it to save couple of $$, but I endup in a bad crash. You can use the futaba 9650, just remember to change to setting in the GY401 to digital.

http://video.helifreak.com/?subpath=finless/trex450&filename=gyro_setup.wmv

hope it helps!!

Helifan06;

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RE: TREX 450 just spins - 9/4/2008 4:47:38 AM   
dennismhart


 

Posts: 16
Joined: 9/11/2007
From: , OR, USA
Status: offline 		In my shop i have seen a few things cause this. One is interference from the tail system on the electronics. Try rerouting the wires. Also i have had a few with slightly loose tail blade grips. And of course there is the occasional failure of the servo. These are just a few of the things i have seen come by my work bench recently.

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       Post #: 15

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