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HomeScaleAircraftScale HeliScale Helicopter Main Discussion › Three blade rotor head{need advise}
01-19-2010 02:44 AM  8 years agoPost 1
rlink2

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ga,usa

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can any give some advise on the best method to balance and adjust the tracking on the blades.

thanks

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01-19-2010 02:52 AM  8 years agoPost 2
Hoverup

rrElite Veteran

Golden Gulf Coast - USA

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First step in tracking is to get all three links between the swash plate and blade grips exactly equal.

Cheers - Boyd
AMA 80393
IRCHA 3355
LSF 853
Major USAF
Retired

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01-19-2010 03:14 AM  8 years agoPost 3
rlink2

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ga,usa

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thanks hoverup

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01-19-2010 03:58 AM  8 years agoPost 4
Copter Doctor

rrProfessor

Enterprise/ft.rucker ,al- home of army aviation

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next comes balancing. easy to do on the odd numbers, it just takes a little time. first get your balancer out, and mount two blades. one is heavier than the other right? okay, remove the lighter blade, then mount the next one. whichever one is heavier, thats your master blade. now add some tape to the lighter blade til they balance. now remove the one you aded the tape to, (what was originally the lighter blade) and mount that first blade. now ad tape to that one til they balance. next you breath a sigh of relief cuz you're done.
a few tips:
before balancing any of the blades, add some colored tape(all cut to the same length and width) to the tip of each blade. this will be for tracking.
when yu are balancing, use the same colored tape as the one used for the tracking and place the piece used for balancing over the tracking tape. this helps keep things nice and neat.

drive a rotary, fly a rotorcraft

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01-19-2010 08:17 AM  8 years agoPost 5
PETER ROB

rrElite Veteran

Devon UK

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Ballancing/ Muliblade tracking
When ballancing use clear vinyl tape.
When ballance and fitted to the heli mark the blade and holder with different coloured paint spots
When tracking, it is only possible to track one blade at a time, choose the master blade,set the required pitch range to this blade, and put a piece of red tracking tape on this blade, now put a piece of yellow tape on another blade, check the tracking until correct, remove the yellow tape and fix to the next blade, and continue until all blades are tracking correctly
The reason for doing one blade at a time is that I found that with putting different coloured tapes on all the blades, all I saw was a blurr of colour, also when doing 4 or more blades I did not have enough different coloured tapes
Hope this is clear
Peter R

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01-19-2010 09:22 AM  8 years agoPost 6
Totto

rrApprentice

Norway

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Hello,
If you just set your transmitter at midstic (zero deg) and dont touch the radio during the whole setup process links/blades etc, tracking is done automatically. Just be very acurate the whole way with the links etc. (adjust even a half turn to get it right).
Blades: I would guess that the weight on your 3 blades are equal so just put them on. If different ie 4 blade head. Put 2 blade with the same weight opposite each other, and the other 2 opposite each other.

Good luck !


Best regards
Totto

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01-19-2010 10:47 AM  8 years agoPost 7
Darkstar1966

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Monaco

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If you really want to get precise you balance both spanwise and chord wise. The above posts are the best way to do the spanwise and then you turn the blades 45 degress and start again and where the span and chord points meet you want to try and get them to the exact same point on each blade. Takes longer yet produces a perfectly matched set of blades.
This way you have no issue with either blade leading or lagging due to the chord balance.

Regards,

Gregory

"Anything that screws its way into the sky flies according to unnatural principals."

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01-19-2010 12:52 PM  8 years agoPost 8
rlink2

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ga,usa

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thanks for the advise. with this info i believe every thing will turn out just right.

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01-19-2010 10:17 PM  8 years agoPost 9
clive45

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NSW Australia

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I was told when adding weight to a blade it should be at the C of G not at the tip otherwise you change the C of G.
I could be wrong, it has been known to happen.

If it cannot fly on it's own, then I won't be much help....

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01-20-2010 02:37 AM  8 years agoPost 10
Gearhead

rrMaster

Vt

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Copter Doctor,, couldn't that Multi Blade Balancing Procedure be done on a 2 blade head ??

Jim
Buzz Buzz Buzz

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01-20-2010 06:59 AM  8 years agoPost 11
PETER ROB

rrElite Veteran

Devon UK

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Procedure be done on a 2 blade head ??
Jim, There is a much simpler way of ballancing a 2 blade head
remove the head from the heli, with blades atatched support everything by placeing the flybar across the backs of a couple of chairs, straighten the blades, then add weight to the blade on the highest end, mark the blade and its holder with a drop of paint/nail varnish
This way you are ballancing both blades and head, a more accurate way of doing things
Peter R

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01-20-2010 01:25 PM  8 years agoPost 12
kennethw

rrApprentice

Toronto, Ontario - Canada

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Since this is in the scale section, this is how I balance my 3 Blades.

I do everything Doctor Copter does, except that I use Clear Coat so that the blades look clean. I do this also because I paint my blades with 'stripes' and have to use Clear Coat anyway.

Unfortunately, this is a very very time consuming proposition. Since blades usually come in pairs, I balance all four this way so that I have a spare in case I kill one of them. This process takes over 6 hours as you need each coat to dry before putting on the next coat.

For Tracking, so far when I use the Ball Link tool, the links are identical in length and my tracking has nearly always been very very close. However, I still use some different coloured tape on each blade to check, but remove it after it is done.

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01-20-2010 07:02 PM  8 years agoPost 13
Gearhead

rrMaster

Vt

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Peter, I guess I misunderstood Copter Doctor's Procedure a bit, that is why I asked what I did, but I got it now, when you mount the 3rd blade for balancing you must mount it in Grip #3..

Jim
Buzz Buzz Buzz

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