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HelicopterHIROBOOther › GPH 346 Belt Breakage
03-11-2003 12:09 AM  14 years agoPost 1
Cessna

rrApprentice

Tucson, Arizona

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Gentlemen:

I have a GPH 346 which I hadn't flown for a couple of years due to a chronic drive belt breakage problem. I flew it for the firrst time again last Saturday. It went in on the second flight of the day due to .......you guessed it.......that @#$% tail drive belt letting go at low altitude.

I've now had five belts break. I've tried varying the belt tension from normal to loose to tight and nothing solves the problem. The last belt broke after ten hours of operation. My Raptor timing belt NEVER broke. I am running the Quick metal patrs in the tail rather than the Hirobo plastic stuff. This stuff should only extend the belt life though!

Does anyone have a suggestion? I am open to any and all constructive ideas!

Thanks!

Steve Cass
Tucson

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03-11-2003 12:33 PM  14 years agoPost 2
mudbogger2

rrKey Veteran

Hoschton,Ga.

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I flew a gph hard for a year, had many crashes but never had a belt break. Look close at the pulley teeth for unusual wear. Mabey a bent frame has the belt running at an offset angle causing it to rub somewhere? just guessing.

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03-11-2003 12:44 PM  14 years agoPost 3
z11355

rrMaster

New England

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if you have the original Hirobo parts,
consider putting them back on, at least
as a 'test' so you may determine if
it is the Quick parts or not.

Are you using the stock Hirobo belt
or are you using an aftermarket belt?
The only problems I ever had w/
Hirobo belt drive on a Shuttle was
w/ an aftermarket belt which snapped
mid-flight

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11-28-2003 05:53 AM  13 years agoPost 4
tauscnc

rrKey Veteran

Joliet IL

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Hey Cessna,

I finally had a belt break in a hover about 50 feet up. Tried to fight it down but lost, damage not to bad. This is the only belt that has broken.

I would check to make sure there are not sharp parts to the plastic pullies, the boom is mounted straight (vertically) and check to see if you have fine dust aroud the parts. I have always noted this. I did find "chipped teeth" on my plastic tail pully and suspect the belt at some point rode on top of it.

The raptor belt and GPH belt is the same. So it must be something in the setup. Either belt should be interchangeable.

tauseef
http://www.cuttingedgecnc.com

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11-28-2003 03:39 PM  13 years agoPost 5
Cessna

rrApprentice

Tucson, Arizona

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Sorry to disagree; but the Raptor and GPH belts are not the same. I've had both. I have never had a Raptor belt break.

Believe me, I've checked out every (and more) that you suggest. Jeff Green is a fantastic guy. I have never had better customer support than he has given me. After my last crash, he sent me a lot of parts to rebuild my tail drive system with. I haven't repaired the heli yet but will put those parts in and see what happens.

I like Hirobo machines a lot. Jeff Green is the best too. The GPH is a great flying heli. But, one more crash due to a belt breaking and that thing is going straight into the dumpster!

Steve

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11-28-2003 04:03 PM  13 years agoPost 6
Helimike

rrVeteran

Raymore Missouri USA

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(Sorry to disagree; but the Raptor and GPH belts are not the same. I've had both. I have never had a Raptor belt break.)

Does this mean you installed a Raptor belt on the GPH and it did not break? If so why not just use the belt for a Raptor , problem solved.
I have a GPH and have noticed powder from the belt on the inside frames.I just thought the belt tension is loose.

Michael

K.I.S.S.

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11-28-2003 06:41 PM  13 years agoPost 7
tauscnc

rrKey Veteran

Joliet IL

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Hey Steve,

When I ordered my belt from ricks they had the heading as raptor/gph belt and I believe it was around $23 ish. I am pretty sure I called and asked if the two use the same size belts. I think most of these belts are made by "Bando," at least the yellow type ones. If that is the case I then think it must be a setup or mechical issue in the GPH just not working out. Huh, I checked to make sure my pullies did not have nicks on them, it the belt is only turned 90 degrees and I am not putting any nicks into it by using a screwdriver to help it over the pulley by the frame.

If you figure it out let us know so we can look out for it on our GPHs.

thanks
tauseef

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11-28-2003 06:52 PM  13 years agoPost 8
z11355

rrMaster

New England

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doesnt that machine use the same odd tail pitch lever that
goes through the casing and between the belt? Is it getting
hung up on that?

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11-28-2003 09:36 PM  13 years agoPost 9
Isaac F

rrKey Veteran

Panama Republic of​Panama

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I like Hirobo machines a lot. Jeff Green is the best too. The GPH is a great flying heli. But, one more crash due to a belt breaking and that thing is going straight into the dumpster!
I Steve, if you going to dump the GPH, please give it to me
I will use it as spare parts for my GPH 50.

Isaac

Speed of light is greater than speed of sound. Some people seem very bright until U hear them speak

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