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HelicopterMain Discussion › woodies going out of track
11-24-2006 11:22 PM  11 years agoPost 1
avatar71

rrApprentice

East Amherst, NY

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Hi all, got a raptor 50 SE with a 50 Hyper. Been running great (probably a bit too much headspeed for woodies) and never been gravitized! Here is the question...

I am noticing that the blades are continually going out of track when I get into idle up. They have been perfect for probably 15 to 20 flights. Suddenly, I notice that the blue taped blade is running high. (Balanced with red tape on one side, blue on the other). I come down, reduce a bit of pitch on the blue blade and all seemes perfect again. Get into idle up and out of track they go again.

Well, she's grounded for now until I check the spindle, put carbons on to handle the headspeed and check the curve with a gauge. Aside from that and checking the ball links for bent screws, anything I am missing? Why would it do this? Spindle bending from woodies??? Woodies about to fail due to high HS?

thanks!!!

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11-25-2006 06:27 PM  11 years agoPost 2
avatar71

rrApprentice

East Amherst, NY

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any thoughts???

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11-25-2006 06:31 PM  11 years agoPost 3
AlanR8

rrKey Veteran

Saddleworth near Manchester (UK)

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Borrow some carbons from a GOOD heli mate and see what happens. Could be the individual blades you have.....

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11-25-2006 11:28 PM  11 years agoPost 4
oldfart

rrProfessor

Vancouver, Canada

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What kind of woodies? Just as in composite blades, there also are some woodies that are better then others

So Heck - why not borrow someone elses woodies and try them.

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11-25-2006 11:32 PM  11 years agoPost 5
avatar71

rrApprentice

East Amherst, NY

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they are TT woodies. I am going to put some TT carbons on that I have. The thing is that they were fine until just recently...

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11-26-2006 12:19 AM  11 years agoPost 6
Portblock

rrVeteran

Van Nuys, CA

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here is a dumb question, what rod are you adjsuting to fix this? There is more that one rod that would change the overal pitch of the blade.

Make sure you are adjusting the one connected to the grip, and at zero pitch, so they both are zero pitch.

If you are not at zero pitch and choose one to adjust, and it happens to be one that is perfect one at zero pitch, then both blades are going to be wacked.

Just an idea, maybe I was over thinking it.

The voices in my head can beat up the voices in your head.

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11-26-2006 01:24 PM  11 years agoPost 7
jkempxx

rrApprentice

Johnson City TN

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This can happen if the feathering spindle (not the main shaft) is slightly bent. It will rotate when the load on the blade increases and will allow for a track change. If there has been no mishaps, then maybe this is unlikely. jkempxx

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11-26-2006 02:18 PM  11 years agoPost 8
avatar71

rrApprentice

East Amherst, NY

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I am turning the longer of the two rods (the one that goes to the swash) because it makes more subtle changes to the pitch. Spindle is straight too.

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11-26-2006 02:51 PM  11 years agoPost 9
440GTX

rrVeteran

Calgary, Canada

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Had the same problem with mine 2 years ago.
It drove me nuts. It was the ball and double linkes that were sloppy.

Hope this helps

Fred..

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11-26-2006 03:49 PM  11 years agoPost 10
jschenck

rrProfessor

La Vista, NE.

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I've found that to track down loose connections I grab each of the main blade grip and very slightly rotate each grip lightly. Just enough to move the linkages without moving the servos. If one moves more than the other then you have the side to look at. In my case I've found that the ball may be just slightly loose on the screw and/or one of the screws may have backed out just slightly like on the seasaw.

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11-26-2006 07:32 PM  11 years agoPost 11
Portblock

rrVeteran

Van Nuys, CA

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just my opinion, start over, if this is a stock head, and unclip one end of each rod, and off the servos. disconnect the aileron swashplate connections.

align the grips to center/zero pitch

align the mixers to flat, then connect the grip to mixers

align the flybar so it is flat

align the washout so they are level/flat, connect the washout to the flybar

level the swash (make sure washout arms are level/flat

now that everything is zero, andjust and connect the long rods from the mixers to the swash.

align the aileron bellcranks so they are 90 degrees, and connect the swash to them.

at this point, adjust the rest of the rods to connect to servos when radio is on, and center sticks. (make sure servos are centered)

now if the blades are off track,adjust the small double links, this keeps the rest of the geometry correct.

a little trick, I use an old blade the was broke at the end, I cut it down to about 5 inches, and use a pitch gauge on it when I setup a head.

If I missed anything, please somone tell me. its early in the am for me at the moment.

hope this helps.

The voices in my head can beat up the voices in your head.

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11-26-2006 09:49 PM  11 years agoPost 12
JAGNZ

rrProfessor

Auckland, New Zealand

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What HS you running? If it is too high, woodies CAN go out of track.


Jason Greenwood

www.3dheli.co.nz

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11-27-2006 09:40 PM  11 years agoPost 13
avatar71

rrApprentice

East Amherst, NY

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hs was supposed to be around 1850 but since no gov, overspeeding did occur frequently. Checked the spindle, stick straight!

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11-27-2006 09:52 PM  11 years agoPost 14
JAGNZ

rrProfessor

Auckland, New Zealand

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I wouldn't go over 1700 with woodies. That may be the cause of your problems... wind it back and see if that helps.


Jason Greenwood

www.3dheli.co.nz

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11-28-2006 12:05 AM  11 years agoPost 15
allns47

rrKey Veteran

Richmond IN.

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I had the same problem,,Found out I was to high of headspeed at idleup...Do you have a tach...

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11-28-2006 12:28 AM  11 years agoPost 16
avatar71

rrApprentice

East Amherst, NY

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yes, I have tach'ed em. But I need to again and my tach is at model avionics getting its upgrade. so until then, I'll be guessing.
Status: Veteran

Registered: Apr 2006
Location: Christchurch, New Zealand I wouldn't go over 1700 with woodies. That may be the cause of your problems... wind it back and see if that helps.
really, not over 1700? I have definitley pushed the blades then. Do you think that the blades can get worse over time?

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11-28-2006 12:39 AM  11 years agoPost 17
JAGNZ

rrProfessor

Auckland, New Zealand

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I would think so if they are developing fractures that you cannot see. From memory, TT recommends NOT going over 1700 with their woodies and their woodies were the best I ever flew.

Also, how did you glue your blade roots? If they are working loose, then that can cause an out of track condition too. The best thing to do is get some GOOD blades to test it. Get some carbons and if you aren't confident, then let someone who is fly her. You'll soon deduce your problem that way. Any other way is pure conjecture...


Jason Greenwood

www.3dheli.co.nz

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11-28-2006 03:09 AM  11 years agoPost 18
jschenck

rrProfessor

La Vista, NE.

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11-28-2006 04:09 AM  11 years agoPost 19
JAGNZ

rrProfessor

Auckland, New Zealand

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Good, not losing my mind then, they DO say 1700RPM Max with woodies...30MB DL to find that tidbit, thanks.


Jason Greenwood

www.3dheli.co.nz

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11-28-2006 04:15 AM  11 years agoPost 20
jschenck

rrProfessor

La Vista, NE.

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I can't believe that they posted it as a PDF, what a waste! It's just a SCANNED image of the printed manual and a bad one at that. Should have been a string of JPEG's.
A real PDF would be indexed, searchable printable and readable.

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HelicopterMain Discussion › woodies going out of track
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