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HelicopterBeginners Corner › blade track changes
09-04-2009 12:16 AM  8 years agoPost 1
garaptor

rrApprentice

Atlanta,Ga,usa

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I should be in the expert section I have flown so long. Im still flying my raptor 30 converted to a 50 and I like it. It fits my budget and skills.50 os with carbon and gyro and rev limiter, +10/-10, loops, rolls,autos, little inverted, 1900 rpm. My problem is my blade track keeps changing. Every time I fly I have to adjust it. I cant see anything obvious wrong. I know something is worn out. Any ideas? Where should I start?

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09-04-2009 12:29 AM  8 years agoPost 2
FlaG8r

rrElite Veteran

Florida

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wooden blades might be the cause. If not, possibly worn out dampners, somethings loose in the head maybe.

Life is tough, it's tougher if you're stupid

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09-05-2009 01:57 AM  8 years agoPost 3
dwight2k

rrApprentice

Newport News, VA

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I have smaller helis and usually this happens to me when I have any slight amount of bend in my main shaft. also make sure everything in the head is tight and check your dampening to make sure your blade grips are not moving and are holding tightwhile keeping the free movements. Onw last thing I experienced on mine that is not likely on yours was my PC links. I realized my links were worn and they were pulling out during high idle and throwing off my track each flight.Hope this helps . Dwight

IT'S NOT 3D I'M TRYING TO GET IT UNDER CONTROL

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09-06-2009 04:05 PM  8 years agoPost 4
heli_headcase

rrKey Veteran

Hovering around Atlanta

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I can help this afternoon...

If you bring the heli out to the field this afternoon (after 4pm) I can take a look at it for you.

If your rotorhead is built 'stock', with the blade grip pitch arms trailing the main blades, the head is very sensitive to tracking changes, especially if the dampers are even the slightest bit soft. If the stock head geometry is to be used, the damping should be set for very stiff otherwise random tracking errors will always be there.


HHC

So many heli's - too little time...

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09-11-2009 01:32 PM  8 years agoPost 5
Zaaaguy72

rrElite Veteran

MN

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My guess would be the Wood Blades. I could never get those things to stay tracked! Switched to CF's about 2 years ago and never looked back.

Team Sanjel!

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09-12-2009 02:10 AM  8 years agoPost 6
garaptor

rrApprentice

Atlanta,Ga,usa

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I dont fly wood blades.See first post. I have been out of town but will go into it this weekend. Suggestions have been: worn out ball links,swash plate,thrust bearings.My problem shows up after I go negative pitch during flight and then return to a hover.

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09-12-2009 07:14 PM  8 years agoPost 7
vavavoom

rrVeteran

London, England

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Most likely a bent feathering spindle that is slowly rotating.
This would account for the heli going in and out of track.
Take it out and roll it on a piece of glass to check it,

## Inteligence is knowing a tomato is a fruit...Common sense is not putting it in a fruit salad

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09-12-2009 07:58 PM  8 years agoPost 8
garaptor

rrApprentice

Atlanta,Ga,usa

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I havent crashed or bounced it in over 100 flights so I dont think the feathering shaft is bent. Something is worn out. Today I flew in with some negative and the blades were out of track so I punched it up hard and came back and the blades were in perfect track! Something is worn out.

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09-12-2009 11:56 PM  8 years agoPost 9
MattJen

rrElite Veteran

UK

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One suggestion and it is something i found out, was the blades over time can tighten in the grips,( cos open and fold them into a caddy at end of the day/session) so you can end up with one blade tighter in the grip than the other, this also can cuase tracking issues in the hover..
that is simplest check..

if not, then

grease in your thrust races,

if the grease has gone over time you are sometimes left with a sticky residue, and as they wear they make little pitts in the bearing washer ring as you have metal grinding on metal, in time these pitts become deeper, so as you add and take off load, the bearings in the cage can become notchy,and this can show up as blades coming out of track..

if they are fine

then
It sounds to me the cause is a nothcy bearing somehwere in the grips.. which as you rightly said is just wear and tear..especially when most of us carry it out to the flight line holding it by one grip..

PS: nothing wrong with putting it in the beginner corner..

Matt

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09-14-2009 10:01 PM  8 years agoPost 10
garaptor

rrApprentice

Atlanta,Ga,usa

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Fixed multiple issues.

Well, I fixed it but I did multiple things.Found some links slightly loose and replaced. Pulled the thrust bearings and they look fine so regreased and reinstall.Found worn out swash plate and replaced with another used but in much better shape. Probably the worst thing was a feathering shaft too tight. It took some pliers to turn it. Its so tight I cant really get any grease in it but I greased over and over and worked it but its still really tight.

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