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HelicopterBeginners Corner › CRAP...Please help real simple question...blade tracking
05-01-2004 02:55 AM  13 years agoPost 1
NitroSpazzz

rrVeteran

Knoxville, TN

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Ok I took my rappy out to the field after a lot of tracking a bit ago. Well it was WAY off. I brought it home and tryed to track them. The problem is that they are IN track perfect until the skids get light, then they are WILDY out of track (about an inch+ at the tips) so what is going on? I figured I would ask here before I messed something up. Thanks ahead of time.

Oh ya its a raptor 30 v1..woodies

Blake

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05-01-2004 03:08 AM  13 years agoPost 2
Ninjak2k

rrApprentice

Centreville, VA

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The faster the blades go, the more a tracking problem will show itself. I couldn't tell from your post if it has been in track and flying in the past and just now is out of track or if this is the first time you've tried to get it in the air. If it's the first time it's been in the air, it could just be what I said above - didn't really show until the head speed got higher.

If they were previously in track and suddenly aren't, maybe some of the covering is coming off your blades slightly when your head speed gets high enough. Try reshrinking the covering and see if that helps.

~Dan

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05-01-2004 03:08 AM  13 years agoPost 3
acwman

rrApprentice

DORSET-UK

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You been in a crash recently??

Any bent links? if not...

more likely Feathering spindle maybe bent??

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05-01-2004 03:10 AM  13 years agoPost 4
Sweatum

rrApprentice

Daytona Beach, Fl.

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Try bending the blades while holding the tips firm and pushing down on the mast. It sounds to me as though you have one weak blade. It won't happen with carbon blades.

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05-01-2004 03:23 AM  13 years agoPost 5
NitroSpazzz

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Knoxville, TN

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Ok...I did crash thanksgiving and it hasn't been flown since, replaced most of head (all the lings, feathering shaft, bearings) and its showing up now that I am trying to fly it I tried the Static tracking method shown on raptortechnique and now its a little late to fly because we have young children in the area that need their sleep. I'll be up bright and early testing things tomorrow though. I'll try the bend test right now and see what happens.......


Well blades are bending the same so I don't think thats it, I also took the heatgun to them and reshrunk them. It wasn't loose but it snugged it p a bit in some places

Blake

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05-01-2004 04:15 AM  13 years agoPost 6
Helimex

rrApprentice

Oklahoma

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Try lubing your dampers a little. I put a dab of silicone on mine to keep them flexible.

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05-01-2004 03:34 PM  13 years agoPost 7
sabooo

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Allentown, PA area

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You can pretty well sort tracking on the bench to a large degree. Measure the pitch of one blade in a particular spot. Then rotate blades 180 degrees and measure the pitch of the other blade in the same spot. If they dont match, adjust your linkages till they do. Keep it up until both blades give the same pitch reading at a particular spot. You should then be able to repeat this exercise starting at any position and have both blades read the same. (of course, moving any controls between measurements will throw you off.)

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05-01-2004 04:31 PM  13 years agoPost 8
NitroSpazzz

rrVeteran

Knoxville, TN

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Ya I haven't picked up a real pitch guage yet I have just been going off of the raptor pitch guage. I did it last night with a homemade thingy that slid onto the blade then a line with a weight hung on a protractor. I got em right on and double checked. Today I start it up and it looks PERFECT until the heli gets light on the skids...then they are out of track horribly. I was planning on flying a lot today but this is really slowing my down and now the wind is picking up so I don't think its gonna hapen today.

Blake

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05-01-2004 11:32 PM  13 years agoPost 9
sabooo

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Allentown, PA area

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The built in guage will help you to set collective range, but not cyclic pitch unfortunately.

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05-02-2004 11:59 PM  13 years agoPost 10
Helimex

rrApprentice

Oklahoma

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I tried using the built in pitch gage and then used a real pitch gage and the numbers were way off from each other. I then just setup using the blade pitch gage and all worked well. The built in gage is worthless as far as I'm concerned. Get yourself a blade pitch gage and life will be good.

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05-03-2004 04:31 AM  13 years agoPost 11
S_Owen

rrApprentice

Wichita Falls, TX.

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Seems to me you're supposed to only check tracking when the bird is light on the skids. Might give that a shot.

[b]Murphy's Constant:[/b] Matter will be damaged in direct proportion to its value.

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05-05-2004 12:31 AM  13 years agoPost 12
yeloowtang

rrApprentice

canada ,quebec,gatineau

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i always check mine at hover,not easy when alone so get a buddy
and tell him to check it as you lift off or get light on skids,
then land and corect it ,and keep doing this until you get it perfect,
always correct the same one ,go one turn at a time t'ill you get in a hover with no more tracking issue.
it may take a few minutes but needs to be done .

good luck and have fun

steff

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05-05-2004 04:01 AM  13 years agoPost 13
Andrew_S

rrVeteran

Gaston, South Carolina

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I had the same problem...Balance the blades at the cg of the light blade, and then check the pitch of each blade with a pitch guage and make sure they are the same....That will get the tracking about right.....
Andrew

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05-05-2004 06:48 AM  13 years agoPost 14
jbiter

rrKey Veteran

Sebring, FL

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You might want to sight down the trailing edge of each blade to see if either blade is warped (twisted). Wooden blades often do this and it causes out of track conditions you are describing.

Jeff

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05-06-2004 05:59 PM  13 years agoPost 15
`3D

rrApprentice

north east

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Did you remove the main shaft and roll it on a FLAT surface to see if it was bent?

Are all the trims at hover position ?.......look at your tracking from all four sides.

What happens when you adjust the tracking..will it stay there.

You can adjust it at the field...mark the tip one one blade...tracking tape or sharpe......run it up...determine which blade is low.....increase the pitch of that blade.

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05-06-2004 07:41 PM  13 years agoPost 16
Wisdom-Seeker

rrVeteran

Danville, CA

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When I first flew my Raven, the tracking was out, and I adjusted one blade until the tracking was perfect. Measuring with a pitch guage on the ground showed a considerable difference between the two blades. Later I crashed, and set up the blades to read exactly the same pitch. Again, once in the air, I had to make a considerable adjustment to get the tracking right. I'm not going to use my pitch guage to argue with perfect tracking performance, but it's clear there is something else entering into the situation.

--

Wisdom-Seeker
Protest letter to insurance co.: What do you mean "Act of God"?

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HelicopterBeginners Corner › CRAP...Please help real simple question...blade tracking
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