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Home✈️Aircraft🚁HelicopterThunder TigerOther › Raptor50 rotor issue
09-05-2006 06:45 PM  14 years ago
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Helijockey

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150 miles from somewhere

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Raptor50 rotor issue
I've recently changed the pinion gear and bell on my heli. Now I can't get the blades to stop As soon as I leave the rotors, they tend to spin pretty fast and even lowering the trim and throttle curve has no effect Otherwise the engine idles and accelerates smoothly. I've almost finished breaking in the engine and have the needle open two turns at the moment. I'd appreciate ur thoughts on this.
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09-05-2006 06:54 PM  14 years ago
Rickenbacker

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Örebro, Närke - Sweden

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Make sure the clutch isn't touching the clutch bell. Things to check is that the fan assembly is still firmly screwed on, and that you didn't leave the washer on the engine.
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09-05-2006 08:02 PM  14 years ago
antsdd

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leeds west yorkshire

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i had the same problem with mine i found i had to assemble leaving screws loose then hold engine inline cheacking for no grabbing then nip up screws also with a new bell did you check the gap on the linning and is your clutch slots inline and not opened up anything slightly wrong with clutch will make it grab including weak clutch i always try bell on clutch first to make sure its clear then i no if it grabs it down to me tightening the mounts up wrong
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09-05-2006 09:35 PM  14 years ago
Helijockey

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Thanks guys I'll check it out and get back to u!
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09-06-2006 12:30 PM  14 years ago
Helijockey

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Guys, I've changed the clutch with another which was on my previous heli. This clutch is totally unmarked and looks new, whereas the one I replaced has circular marks all over it. Now when I started the engine it seemed as if it was in idleup, then the rpm settled down and was totally ok on the second start. Could it be that the liner has been damaged again by the previous clutch, or perhaps this clutch is not ok also? The rotors also seem to move much less now but still I feel they r too fast.
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09-06-2006 03:45 PM  14 years ago
BarracudaHockey

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Jacksonville FL

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You need a gap between the liner and the clutch. The old clutch liner was probably worn allowing the shoes to spread out. The simplest method to fix it is replace the clutch.

The second choice is to put the bell in a lathe and have the liner turned down a few thousands.
Andy
AMA 77227
http://www.jaxrc.com
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09-06-2006 04:54 PM  14 years ago
Helijockey

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I think u r right BarracudaHockey, I"ll change the clutch and liner.Thanks
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09-06-2006 05:32 PM  14 years ago
BarracudaHockey

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Jacksonville FL

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If you do the liner wrap two layers of electrical tape around the clutch, flush with the top and butted end to end, don't over lap the ends.

Glue the clutch liner in with 30 min epoxy or jb weld and push the clutch up into the bell, remove it when dry and you will have a perfect clutch gap.
Andy
AMA 77227
http://www.jaxrc.com
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09-06-2006 05:53 PM  14 years ago
Helijockey

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Will do, thanks
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09-07-2006 01:06 PM  14 years ago
Helijockey

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150 miles from somewhere

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BarracudaHockey I've ordered the clutch and bell, also I noticed with the present clutch and bell starting the heli is a pain. When I try to start the engine the starter coupling becomes free and I can't start it. Also the coupling becomes very hot, so should I replace the starter shaft as well?
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09-07-2006 05:00 PM  14 years ago
BarracudaHockey

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Jacksonville FL

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If I were you I'd split the frames and check the start shaft bearings. If they are ok put it back together and make sure the shaft is being pushed up while the coupler is being tightened and make sure that the set screws are engaged on the flat spots on the start shaft and locktited in.

Put the motor to the mount fairly loose and install the motor mount/engine and tighten the frame bolts. Then, while spinning the start shaft backwards tighten the 4 motor to motor mount bolts, if you feel any resistence in the start shaft back off that bolt and switch to another till all 4 are tight and the start shaft spins freely, this will give you optimum motor/clutch/start shaft alignement. Then you wont have to do that again if you drop the motor as long as the engine to mount bolts dont get removed.
Andy
AMA 77227
http://www.jaxrc.com
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09-09-2006 03:38 PM  14 years ago
Helijockey

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150 miles from somewhere

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BarracudaHockey, I changed the starter shaft bearings, starter shaft, clutch and bell. Still can't get the blades to slow down The engine starts at very high rpm's and once I do a circuit and land, then the rpm is perfect. The blades even stop and spool up perfectly!
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09-11-2006 06:38 AM  14 years ago
armadillo

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México

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09-11-2006 03:33 PM  14 years ago
BarracudaHockey

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Jacksonville FL

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Either your servo isnt' going to true idle or more likely you just have to let your engine warm up a minute. Try blipping the throttle before you set it down and see if that gets it to settle down.Andy
AMA 77227
http://www.jaxrc.com
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