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HomeAircraftHelicopterBeginners Corner › Blades slow down &off track while descending
02-07-2006 11:47 PM  12 years agoPost 1
2themax

rrNovice

San Francisco, Ca.

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I've changed my dampers and my main shaft on my Raptor 30v2 in hopes of ridding the problem of blades slowing down and going exrememly off track. I've checked all the linkages and they seem to be intact, this happened before I changed my os32 engine because my
old engine was nearing the end of it's life...
I thought maybe the engine had something to do with it, but now I that I have a new engine, it's still happening.
I've checked my spindle and rolled it on a glass table and that to seems fine...
Ran out of ideas--

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02-08-2006 12:09 AM  12 years agoPost 2
Yug

rrMaster

UK. Herts

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There must be no play in any of the bearings or ball links. If your HS is slowing down during descent, then youre throttle curves aren't right. If blades slow down sufficiently, then it could be a resonance problem resulting in feathering - blades off track. Are your blades balanced properly ? If there are any out of balance problems, then a different HS will show this up as different resonant conditions manifest.
Are your dampers lubed OK ?
Reds or Blues ?
Are your bearings in good nik ?
Is main shaft bent ?
Are paddles lined up OK ?

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02-08-2006 12:23 AM  12 years agoPost 3
2themax

rrNovice

San Francisco, Ca.

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Blades
My dampers are new(blue) and lubed,my main shaft is new,my paddles are straight, there are no play on the linkages or ball links, my throttle curve was set up by an experienced flyer.
Blades are new and balanced...
I haven't checked the bearongs though, which bearings are you talikng about??

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02-08-2006 12:26 AM  12 years agoPost 4
Yug

rrMaster

UK. Herts

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All bearings related to the head and main shaft. If your HS is reducing in descent, then it shouldn't. If you're not running a governor, then tweek your throttle curves to maintain a constant HS.

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02-08-2006 12:36 AM  12 years agoPost 5
2themax

rrNovice

San Francisco, Ca.

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Blades
I forgot to mention it doesn't do it all the time though, like this morning when I flew, it flew with no problems.
Then I'll go back out to fly and all of a sudden it's doing it again.
This has happened on numerous occasions,but I will seek help on tweaking the throttle curve and hope for the best.
What other possiblities could it be if it's not the throttle curve??

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02-08-2006 06:08 AM  12 years agoPost 6
Rcer22

rrVeteran

Somewhere In The Adirondack Mountains

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You might have a stress crack in one or both of the blade grips.
Have you also checked all the head screws? Maybe it doesn't happen all the time because of temperature.

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02-08-2006 02:08 PM  12 years agoPost 7
BarracudaHockey

rrMaster

Jacksonville FL

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Woof and poof. Woof is the sound the blades make, poof is what happens when they hit the boom in flight.

Check your blade grip bearings for tight fit against the spindle and for tight fit in the blade grips.
Remove the screws that hold the balls to the blade grips and ensure one or both aren't bent.
Make sure your thrust bearings and lubed and that the bearing races are installed correctly.
What blades are you running and did you replace the blades prior to this showing up?

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

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02-08-2006 03:38 PM  12 years agoPost 8
falcon

rrKey Veteran

UK

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Do you think your autorotaton bearing is sticking.
When you throttle down the head speed goes down also.
cheers
Kent

www.m0kwr.com

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02-08-2006 03:52 PM  12 years agoPost 9
2themax

rrNovice

San Francisco, Ca.

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BLADES
I was using some fiberglass blades when this first occured, and now
I am using TT 550 blades hoping that would also cure the problem.
I've recently checked the blade grips when I checked the spindle
and they seem to be ok. I only checked one of the bearings on one
blade grip, hmm ... I think I'll go check the other blade grip.

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