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HelicopterBeginners Corner › Raptor 30 Blade Balance
12-11-2004 04:34 PM  13 years agoPost 1
Buggy

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Scarborough, ON, Canada

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Hi,

Sorry if this has been asked before, but what sort of error is acceptable for both the centre of mass and mass of the main rotor blades? I've got the stock wooden blades that come with the heli.

TIA,
Tim

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12-11-2004 04:41 PM  13 years agoPost 2
blockatvalpo

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Reston, VA

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Just make sure they balance/equal weight. I never worried about balancing the cord on woodies. Just use the tape on the not so heavy one and when they balance, you are good to go.

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12-11-2004 05:18 PM  13 years agoPost 3
Butch

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New York

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Buggy, Ideal goal : Both blades equal in weight, and center of gravity at identical locations. For sport/general flying, what has worked is : weight difference of 1/4gram , CG difference 1/16 of an inch. Important to know where you can and cannot place weight along the blade. Hope this has helped.

The Whirlybug Bit Me!

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12-12-2004 05:48 AM  13 years agoPost 4
Buggy

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Scarborough, ON, Canada

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Butch, block,

Thanks for the help. After installing the screws for the blade grips and weighing/balancing the blades again, I've found that both are pretty close to each other, within the limits anyway.

Butch, as for the placement of weight (academic, I know), where and where not can it be placed? My assumption would have been to place it where it would properly adjust the CM.

Now onto adjusting the linkages for the rotor angle

Thanks,
Tim

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12-12-2004 04:35 PM  13 years agoPost 5
Butch

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New York

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Buggy, Considering rotational force, the effect of weight changes as to its placement along the blade... ie: TowardTip=greater...Root=less.

After you match the cm point of each blade, when you mount them togeather to check overall balance, add weight AT cm. This will keep your cm's matched within tolerance.

You could spend an entire flying season in you workshop trying to balance a set of blades! A scale, to weigh each blade, and a fulcrum for finding cm, will tell you where youre at.

Balancing will take a bit of time to figure out. After which you can do quickly and accurately . Good luck!

The Whirlybug Bit Me!

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12-12-2004 06:39 PM  13 years agoPost 6
Buggy

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Scarborough, ON, Canada

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Butch,

I've got it. You're still speaking of attempting to balance the moments of inertia. I thought you meant balancing how far forward the CM is along the short dimension of each blade, but now that I think about it, I suppose the throttle/pitch takes care of that.

I do like that idea of further adding mass to the CM's of the blades. I'll give it a try.

Thanks,
Tim

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HelicopterBeginners Corner › Raptor 30 Blade Balance
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