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HomeAircraftHelicopterThunder TigerRAPTOR 50 › Something is getting stuck at low RPM
03-03-2008 07:55 PM  10 years agoPost 1
RaptorFun

rrNovice

Ogden, Utah, USA

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The belt jams for a second then its fine then it does it again. Could it be the clutch? I also had a very hard time shutting it down, throtle was all the way down and wouldn't turn off. I was thinking maybe the clutch is getting stuck..........

Any help please

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03-03-2008 08:29 PM  10 years agoPost 2
BarracudaHockey

rrMaster

Jacksonville FL

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Well the belt tension is the first and easy thing to look at.

Also make sure the pin that holds the tail gear is in place, it can work its way out and rub against the case.

The engine should shut down regardless of the clutch or your throttle linkage isn't set up correctly.

Andy
AMA 77227
http://www.jaxrc.com

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03-03-2008 09:24 PM  10 years agoPost 3
RaptorFun

rrNovice

Ogden, Utah, USA

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Checked the belt,throttle linkage and tail pin, there on right, when I turn the main spur gear by hand it starts to turn then it stops turns again then stops, makes a clicking noise....

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03-04-2008 12:44 AM  10 years agoPost 4
David Blain

rrKey Veteran

Mt. Dora, Florida (USA)

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I'm with Barracuda, Check and recheck the pin in the tail along with bearings to be sure they are not locking up, those parts are prone to failure. Recheck belt tension and check your belt make sure your missing no teeth! Once "Boom Back" is covered address your attention to the gear and the bearing, check the teeth on the gear and then take the bearing apart, clean-relube, (or replace it if needed). So basically you need to address everything from mainshaft gear back, also pay attention to the rollers (Idle guide pulleys) and the problem lies somewhere within.... Good luck, Let us know!

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03-13-2008 01:47 AM  10 years agoPost 5
keithstric

rrApprentice

Douglasville, GA - Douglas

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Did you ever find a solution to this issue? I'm experiencing the same thing. Took it all apart and all seems good.

Keith

Synergy N5, OS 55, CY MPII-50Q, GY611

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03-13-2008 02:11 AM  10 years agoPost 6
OK HELI

rrApprentice

Billings, Montana - USA

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it also happened on my titan..Its the belt tension!!!
the only way to get mine to spin free is to tighten the belt pretty darn tight. if I move my boom back in about 1/2mm it binds again..try it.
when I put it together I adjusted it the way the manual said and it has never worked that way, just keep pulling it out 1/2mm at a time( I put a little pen mark right at the base of the boom behind frame to have a visual).
Those belts have to be tighter than the SE since they are longer and have more room for droop.

After first flight recheck again. my very first flight with my new heli was almost a crash cause when I landed I seen red dust and thought it was the tail gear but it was the belt pulleys on the side of the frame, the belt came loose and started to eat them

This is the only downside to the titan I have found, I think the main shaft needs to have a lower bearing for the fact that the belt is putting extra force on it sideways since you have to tighten it so much.

Raptor 50 Titan with DX7, GY401, and TT Redline 53 is Awsome!

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03-13-2008 04:55 AM  10 years agoPost 7
jschenck

rrProfessor

La Vista, NE.

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cold weather causes the aluminum boom to shrink a bit which will cause the belt to get loose when it was properly adjusted at the shop.

if your belt is still catching and is too sensitive you may want to check and make sure there isn't an extra twist in it.

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03-13-2008 12:44 PM  10 years agoPost 8
S Bell

rrApprentice

Nova Scotia Canada

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the belt came loose and started to eat them

This is the only downside to the titan I have found, I think the main shaft needs to have a lower bearing for the fact that the belt is putting extra force on it sideways since you have to tighten it so much.
The bearings on the mast last a very long time and there is no radial slop. That being said suggests to me that the design is sound with two bearings an so requires no added complexity.

One reason the belt needs to be tight has to do with the big pulley causing a large angular change in the belt. The small red return side idler needs tension cause that's where the belt whip occurs under load. If you were to get around this design you'd have a more complex belt drive system with added chance of cog jumping with two small pulleys instead of one large and one small plus more parts to maintain.

I think with all said and done it's a good trade off but you need to monitor the belt tension for temperature change and extreme abuse.

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03-13-2008 02:44 PM  10 years agoPost 9
OK HELI

rrApprentice

Billings, Montana - USA

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I can agree with that..
I still believe I would go to the torque tube if offered for the titan though.
with the belt off the rotor spins nicely but once the belt is on and tight it really robs a lot of energy from the main. JMO.

Raptor 50 Titan with DX7, GY401, and TT Redline 53 is Awsome!

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03-13-2008 03:01 PM  10 years agoPost 10
jschenck

rrProfessor

La Vista, NE.

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you may have the lower main mast bolt a little tight then. This will cause the tail drive gear to drag against the one-way bearing a bit. Try backing off that bolt just a little and see if it spins a bit smoother.

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03-14-2008 11:20 AM  10 years agoPost 11
HotsHabit

rrVeteran

Idaho

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Either the belt is loosening up when he takes the heli outside in the cold air (tail boom shrinking) or he is missing some teeth or a partial tooth on his belt.

Let the heli sit out in the cold for about 10 minutes then set the belt tension. Didnt ever have to worry about that with the old concept 30 shaft drive.

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03-16-2008 12:55 AM  10 years agoPost 12
Jeff polisena

rrElite Veteran

westpalmbeachflorida usa

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The red gear in tail case will wear down teeth and belt will jump even if you tighten belt look at teeth and see if they are smooth rolled edges if so replace

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03-16-2008 03:29 AM  10 years agoPost 13
RaptorFun

rrNovice

Ogden, Utah, USA

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Thanks all for your information, The Raptor is new, only a few flights. I took it apart...everything seems fine. The only thing left to check is the (ONE WAY CLUTCH WITH BEARING ASSEMBLY).

Thanks so much for your help guys

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03-16-2008 12:40 PM  10 years agoPost 14
Jeff polisena

rrElite Veteran

westpalmbeachflorida usa

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Being new motor alignment can be out putting pressure on one side of bell maybe belt twisted to many times in boom

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