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HomeAircraftHelicopterThunder TigerRAPTOR 50 › I just realized I didn't balance the head or tail
01-17-2009 12:11 PM  9 years agoPost 1
CUJO

rrApprentice

San Angelo, TX

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Does anyone really balance the tail and head before putting it on? I know to balance the blades, and I read about balancing the head and tail in Ray's but in my excitement of putting my heli together I forgot to balance them. Does anyone really do this all the time, or just when they notice a vibration they can't explain? I couldn't imagine that pre-molded plastic is going to be so far off in weight that it will cause proglems.

Rappy 50 Titan, OS Hyper 50, Futaba 2.4 7ch.

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01-17-2009 12:19 PM  9 years agoPost 2
ady

rrKey Veteran

norfolk england

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yo fella , i`ve flown for years n years , planes n heli`s , never balanced nothing , usual cos the stuff don`t last long enough to worry about it , seriously tho , a well balanced machine will be silky smooth , depends on the time you have n the way you fly , have fun dude

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01-19-2009 12:45 AM  9 years agoPost 3
Swoop

rrElite Veteran

Newark, DE USA

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The only part on my Raptor that I balanced was the clutch and fan assembly and that was prob not neccessary.

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01-19-2009 12:51 AM  9 years agoPost 4
Steff Giguere

rrProfessor

St-Eustache, Quebec, Canada

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I always balance the main blades but never fan or tail blades, unless I get a major vibration problem.

Team Synergy, Rail blades, Team Scorpion, V-Team

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01-19-2009 02:55 AM  9 years agoPost 5
arrio

rrApprentice

Newport News, VA

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If you are running carbon blades, it is usually not neccessary to balance the main rotor assembly. Manufacturing processes are very good these days and carbon blades are normally a bolt on and fly affair.
The flybar and paddle assembly is about the only thing that would really need your attention as far as balancing goes.
The tail rotor assembly pretty much falls in the same catagory as the main blades. It is usually unlikely that a pair of carbon tail blades would need to be rebalanced. However, there is always the chance that a mechanical spacing is slightly off produceing an imbalance and vibration. But this is not common, as current heli designs try to reduce the chances of parts mismatch or omission in assembly.
So, in summary, just verify the flybar paddle alignment and balance, and go fly.

"fly it like you hate it"
Alfred (arrio) Riopel "more toys than time"

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01-19-2009 03:54 AM  9 years agoPost 6
AaronJohnson

rrElite Veteran

mason,MI

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Balancing parts and assemblies on a heli is more important on a stacked frame heli design because the are more rigid and transmit a lot more vibration and also they tend to resonate a lot more then a plastic framed heli like the raptor. With raptors you can "get away with more" (so to speak) because of the plastic frame.

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01-19-2009 01:40 PM  9 years agoPost 7
TachyonDriver

rrKey Veteran

Chipping, Lancs, UK

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Out of interest - how do you balance the head? The quick & dirty (but effective) way for blades is to bolt them together & place between two glasses or tumblers.....

Tach.

PS - "It's a Raptor, just fly!"

Little Spinning Bundle of Joy® DON'T DISS THE DINO!!

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01-19-2009 02:41 PM  9 years agoPost 8
CUJO

rrApprentice

San Angelo, TX

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Well I know I have to balance the blades, cause even the instructions say to do that. But I keep freaking reading Rays book and it makes ya feel like the whole thing is going to shake apart if you don't do the stuff in it.

Rappy 50 Titan, OS Hyper 50, Futaba 2.4 7ch.

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01-19-2009 03:17 PM  9 years agoPost 9
concho

rrApprentice

montreal canada

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get rays dvd building and balancing rotors blades
you wont be in the dark anymore

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01-20-2009 01:14 PM  9 years agoPost 10
TachyonDriver

rrKey Veteran

Chipping, Lancs, UK

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get rays dvd building and balancing rotors blades
Does that one cover balancing the rotor head itself?

Cheers,
Tach.

Little Spinning Bundle of Joy® DON'T DISS THE DINO!!

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01-20-2009 06:52 PM  9 years agoPost 11
SansHeli

rrNovice

Brisbane, Australia

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Does that one cover balancing the rotor head itself?
Sure does - Ray's Authoritative DVD Series - Building & Balancing Rotor Blades deals with that topic in deapth. I have every one of Ray's DVD's - worth every cent!!!!

SansHeli

"It's not just that helicopters crash....." - RH

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01-22-2009 04:40 AM  9 years agoPost 12
turboomni

rrProfessor

East of the Equator

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I have had many pairs of carbon blades that needed to be balanced,,and were of high quality. They are the biggest overall rotating mass on a heli. At Least check them,,no matter what !!!
my 2 cents.

Setup is everything, All my heli's can fly far better than I can pilot them

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01-22-2009 01:43 PM  9 years agoPost 13
alfred

rrVeteran

Australia, New South Wales, Mid North Coast

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LOL
You are going to be driven nuts by the answers

Raptor50 and I am assuming that you are a Novice, so to get this bird to fly without too many hassles and vibrations:

Main Rotor head:
Set the Flybar at the exact same spacing on each side of the head.
Work out the distance that the Paddles have to be screwed on and use some tape on the flybar so that you know when you have screwed them on the exact difference. Set the Paddles as accurately as possible parallel to each other. Double check there distance from the head to the inside of the paddles.
Disconnect every linkage that you can from the flybar. the once you can't disconnect at the flybar, unscrew the rod, so just the ball link is left. Now lightly tap the flybar up or down and watch where it stops. If it stops always the same side down, lightly sand the paddle.
the flybar should stop after tapping it in any random place/angle.

Your Flybar is now balanced.

Mainblades:
Buy a decent set of carbon blades and bolt them on...keep the drag when swinging the blades in their bladeholders on both sides as even as possible. tighten Mainbolts until its as even as you can tell.

Engine Fan:
If it's just the plastic one by itself, balance wise just bolt it on.
If you mount a magnet, then you MUST balance the fan.

Tailblades:
Just bolt the once from the kit on..their fine.
CF Tailblades will be balanced anyway.

Quite a bit of vibrations can come from a badly tuned engine. Either too lean (pre-ignition) or too rich (burping) will give you vibrations and make your tail kick.
The above will get you going just fine.

Now if you really want to go into accurate balancing for a silky smooth heli.....you will have to do a lot of reading/learning, it's a huge chapter.

I have 5 different type of balancers, 3 Dial Indicators, magnetic bases, V blocks.....

Depending how far you want to go, it can take me easily just as much time to align and balance parts as it took to build the whole heli.
the reward is a heli that isn't just smooth but also ultra reliable due to the lesser stresses on all parts.

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01-22-2009 11:36 PM  9 years agoPost 14
datidun

rrKey Veteran

N Ireland

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this will give you peace of mind ,even the master curtis youngblood said balancing the rest of the head was a waste of time ,he balances the main blades according to his book.

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01-23-2009 03:40 AM  9 years agoPost 15
jschenck

rrProfessor

La Vista, NE.

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I have had many pairs of carbon blades that needed to be balanced,,and were of high quality. They are the biggest overall rotating mass on a heli. At Least check them,,no matter what !!!
yep +1 to that
Tailblades:
Just bolt the once from the kit on..their fine.
CF Tailblades will be balanced anyway.
not been my experience. I have had to balance nearly every set of tail blades I've tested. They spin a 9,000 RPM with a 2,000 RPM headspeed so it's really important to balance the tail blades.

I always check the fan for both balance and runout. Not much you can do about the runout on a Raptor but it's good to know where you stand. Balance is tough to check since it's a threaded fan hub but I check it to see if it falls really hard to one side.

The most important item on the engine is the clutch. Get the run out to less than 2 thousandths and it'll be a much smoother running heli. That clutch is spinning at 17k RPM. If it's off even a little it'll shake like crazy.

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HomeAircraftHelicopterThunder TigerRAPTOR 50 › I just realized I didn't balance the head or tail
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