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HelicopterMain Discussion › Should all blades be balanced???
01-22-2007 12:05 PM  10 years agoPost 1
6cuda6

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Ontario, Canada

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I was just thinking.....should all blades be balanced when you buy them new?? Even carbons??? or are they balanced from the manufacturer???

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01-22-2007 12:30 PM  10 years agoPost 2
TOSH

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UK.Peterborough

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Most blades these days come balanced but its never a bad idea to check them.

Flybars. Who needs `em.

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01-22-2007 12:36 PM  10 years agoPost 3
AV8TOR

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Fort Worth, TX

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Yes check them because you pay the price if they are out.

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01-22-2007 12:37 PM  10 years agoPost 4
JRjoe

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Jonesville , IN USA #1

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All blades may not need it but i ALWAYS check them anyway.
My NHP's always have balanced right out of the box. Just got some Radix 710's and they were perfect too...............


JRjoe.....
Indoor plumbing??? No, we don't need that!!!

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01-22-2007 12:49 PM  10 years agoPost 5
6cuda6

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Ontario, Canada

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That brings me to the next question...what is the PROPER way to balance them.....

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01-22-2007 01:00 PM  10 years agoPost 6
eyeflyhelis

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charlotte nc

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YES! & most especially if they same they come balanced

only you have the power to make no difference!

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01-22-2007 01:02 PM  10 years agoPost 7
eyeflyhelis

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charlotte nc

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balance dynamically (one blade balanced at the middle point) then bolted together at the root and equal out the weight.
if your just hovering or doing light FF just balance them bolted together

only you have the power to make no difference!

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01-22-2007 05:05 PM  10 years agoPost 8
Mitchell Kahn

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Los Angeles CA

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Blades need to weigh the same (within a couple of tenths of a gram) and have the same CG.
I have a small length of 1/2" angle I use as a fulcrum, but I have used a pencil in a pinch. Lay each blade, one at a time, perpendicular on this edge, moving it left and right until it balances. Draw a pencil line across the cord of the blade at this point.
Now weigh each blade. If you have to add weight(hopefully just tape), add it to the lighter blade either near the root or near the tip so that you are moving the CG closer to the CG of the heavier blade.
Mitch

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01-22-2007 07:18 PM  10 years agoPost 9
Mr Fluffy

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Last train to transcendental

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There's a vid on blade balancing by an ex (read banned) RR member called Finless over on heli-freak (no hyphen).

He shows how to do simple balancing by just bolting the together and also extra balancing by getting the CG right first.

I'd post the link, but it'd probably get mashed or deleted.



of course it's the same helicopter love. Would I lie to you ?

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01-22-2007 08:39 PM  10 years agoPost 10
hedgebird

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New Canaan, 06840 CT, USA & Copenhagen, Denmark

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That was a great video :-) thanks for this

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01-23-2007 12:31 AM  10 years agoPost 11
chopper_crazy

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Delphos, Ohio

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One word, YES. Take a look at my gallery. It should explain why all blades should be balanced and checked twice. Before this heli was destroyed, it was a brand new evo 50. The guy I bought it from said he used the wood blades before so I never thought anything of it. Needless to say, I threw them on w/o checking them and I paid for it. The heli was destroyed before it ever left the ground.

It's a complex, costly, glow powered anti-gravity machine!

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01-23-2007 01:25 AM  10 years agoPost 12
Yug

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UK. Herts

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I've only had 4 sets of blades that didn't require balancing. 2 of these were Radix, plus a pair of Vs and Maniacs. Generally I look for CGs to be within 0.2mm and weight balance under 0.1g but this says nothing for aerodynamic balance.
Wouldn't it be nice to buy a pair of blades and expect them to be perfectly balanced, but the real world doesn't work like this. Ultimately, it is your responsibility to check everything including tail blade balance etc etc.

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01-23-2007 02:19 AM  10 years agoPost 13
JRjoe

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Jonesville , IN USA #1

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The Master has spoken......


JRjoe.....
Indoor plumbing??? No, we don't need that!!!

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01-23-2007 03:01 AM  10 years agoPost 14
crash-

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Ca

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should be balanced 3 ways
length, width for lead lag, and total weight
If I remember right fully sys blades balance
at 33% back from leading edge

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01-23-2007 03:34 AM  10 years agoPost 15
billm

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Liberty Lake, WA

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I have had real good luck with my TT 600mm CF blades out of the box.
I still take the time to check them out.
I worry more about clutch run out as the blade cundrum seams to have gone away.

My name is Billm. Cough, and I'm a Heli Holic

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01-23-2007 01:41 PM  10 years agoPost 16
Shuff13

rrNovice

UK

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Rotortuners say yes to balanced blades!

I'm a rotortuner in the RAF you would not belive how much difference an unbalanced blade can make i'ts ideal to get the blades the same weight but it will never happen! just get them as close as you can or your helicopter will shake its self to bits and that costs money! so that little extra time setting up is always worth it!

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01-23-2007 04:56 PM  10 years agoPost 17
w.pasman

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Netherlands

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Here's how I balance the main blades
balancing

Last pair of SAB's were balanced right out of the box, the earlie pairs I had were not.

This is why it is important to have them balanced:
why balancing

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01-23-2007 05:11 PM  10 years agoPost 18
Yug

rrMaster

UK. Herts

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I find it easier using the razor blade technique where you mark diagonals on the blade made by razor marks in a small square of masking tape stuck to the blade. The intersection is the exact CG. Then I weigh each blade with a balance accurate to 0.01g.

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01-23-2007 07:44 PM  10 years agoPost 19
Droid

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Deep down in the Southwest- UK

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Thats a lot of effort to go through when the life expectancy of the blade is very low. Sod it i just bolt and go But MAh blades seem to be very good out the packet.

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01-24-2007 12:29 AM  10 years agoPost 20
Yug

rrMaster

UK. Herts

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It's well worth the effort on both the mains and tails as the heli will fly much more precisely, with ease, and not wear out so quickly.

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HelicopterMain Discussion › Should all blades be balanced???
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