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HelicopterMain Discussion › Warning!! Raptor Pilot’s…
10-07-2005 05:43 AM  12 years agoPost 21
3Dx

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Monterrey NL

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Thanks for The Photo rstacy, now they can see watt I was taking about.

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10-07-2005 05:45 AM  12 years agoPost 22
3Dx

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Monterrey NL

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Thanks for The Photo now they can see watt I was taking about.

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10-07-2005 06:27 AM  12 years agoPost 23
DaOne

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Prineville, OR - USA

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WOW, never saw one that bad.........only badly rounded ones that flew like that forever. Guess I might rethink geting a metal one now.

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10-07-2005 06:29 AM  12 years agoPost 24
rstacy

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Rochester, NY

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Guess I might rethink geting a metal one now.
I wouldn't and in fact I didn't.
This pulley was many years old and had many many hard flights on it.
I got my money's worth out of it.

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10-07-2005 06:31 AM  12 years agoPost 25
DaOne

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Prineville, OR - USA

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It's the "went fast" part that scares me.

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10-07-2005 07:00 AM  12 years agoPost 26
Stet

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Key Largo FL

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When I see that pulley it makes me think of another common failure mode of belt drive helis.

If the belt is too tight, it is not uncommon for the tailbox bearings to overheat. I have seen them in one case overheat to the point that the tailbox melted at the bearings resulting in a crash.

I am very suspicious that belt tension is part of the event. I often find raptor belts extra tight. Don't forget that mild temperature changes cause a definate change in the belt tension due to expansion of the aluminum. For instance, set it up in your air conditioned house and go fly in the sun on a hot day and you have a sprung belt.

Belt too loose will click on spool-up, belt too tight gives no warning.

Check your tailbox bearings and report back what you find.

keepin' it real

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10-07-2005 05:11 PM  12 years agoPost 27
FlyinBrian

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USA

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'The tail rotor system has enough drag that a pulley without teeth will pirouette as fast as a pegged left tail rotor stick"

If there was enough drag and the gyro was still working would'nt it slow down the piro?

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10-07-2005 06:41 PM  12 years agoPost 28
rstacy

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Rochester, NY

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No.
It was a "tongue-in-cheek" comment to emphasize the point that a rear pulley with no teeth will be as effective as no tail rotor at all.

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10-07-2005 07:33 PM  12 years agoPost 29
Wa11banger

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Huntsville, Al

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The drag of the the blades in the air relates to the belt slipping on the drive pulley for them.. Means they will have enough loss to be ineffective

Just my .02
Rick

Proud member of the Quick UK, Duralite Flight Systems, V-Blade, & KBDD team

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10-07-2005 08:40 PM  12 years agoPost 30
dannyh5

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England

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I have had problems with tail pulleys before. With a belt whipping around a plastic pulley things get a little warm and the pulleys deform. Upgrade to a quick UK pulley this is one of the few places an upgrade is useful. One clue to watch out for is tail kicking on deformed pulleys.

It’s easy but pointless to blame a gyro. Any gyro can go wrong so changing it will not make your heli or flying safer. I remember using a mechanical gyro with no major problems and there is always someone who will tell you the change it regardless of what you are using.

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10-08-2005 12:53 AM  12 years agoPost 31
Jason WAI

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Hong Kong

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Below is a picture of the rear pulley off of our Raptor 50 that caused a crash during a night flight.
thanks for the photo .

now , I understand how bad it is


Perhaps, the belt is probably too tight

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10-08-2005 01:22 AM  12 years agoPost 32
eSmith

rrVeteran

Edmonton, Alberta,​Canada

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Never saw a pully go that bad before myself. But then again, I used a metal gear for a long time and just switched to the plastic one. If you are hard on your tail (extreme 3D) then the metal gears can strip teeth off the belt. Sometimes the teeth do not come completely off and you will find you have to remove the belt and run the thhth between your fingers to find all the bad ones, I had about 6 spots on my last belt that had a few teeth letting go. Plastic pully's are much cheaper than belts. I'd rather replace the gear than the belt.

Also, I have never hard of this as a weak point on a Raptor, For all the raptors sold, we have a small number of guys who are claiming worn gears. I would go looking for the cause as it must be something out of sorts or the gear wouldn't have gone so fast.

The belt tension can be an issue, there are a few spots on the Rappy tail that need a good going over and the tension is an important one. Just a note for more northern pilots. The Boom can also contract if you fly in the fall or winter. It is common for us in Canada to have the tension just right at home and it gets so sloppy when you take it outside you have to tighten it after it gets down to tempeture. The common error next is to bring it home and not loosen it, it will get very tight and a too tight belt is bad.


-eSmith.

http://www.edmheli.ca

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10-09-2005 03:01 AM  12 years agoPost 33
3Dx

rrElite Veteran

Monterrey NL

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Joust to let you know, I check my raptor 50 SE that have more flights than the V2 with the problem of the pulley and no problem at all, so the conclusion is that something was rung in the setup of The Raptor 50 V2,
So you can be Relax DaOne, joust special care of the tension of the Belt!!

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HelicopterMain Discussion › Warning!! Raptor Pilot’s…
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