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Home✈️Aircraft🚁HelicopterHelicopter Main Discussion › fuel proof balancing tape.
01-14-2006 03:16 AM  13 years ago
cdrking

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Seattle

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Does anyone use one of these?

It would seem that if you are going to go to the trouble of balancing the blades that you would go all the way and check both span wise and chord wise CG.

I am a tool hound and still don't own one. Maybe someday.

Jeff

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01-14-2006 04:49 AM  13 years ago
dkshema

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Cedar Rapids, IA

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Span wise and chord wise CG can easily be determined using a blade from a utility cutter like this:

http://www.alansupply.com/detail.asp?product_id=SL505

Put the knife blade, sharp edge up in a vise. Put the rotor blade on the knife edge, at about a 45 degree angle to the knife edge, then move the rotor blade back and forth until it balances. Apply a little pressure to the rotor blade and move it along the knife edge at the point where it balances -- this will leave a small mark in the rotor. Turn the rotor blade 90 degrees, balance it again. Slide it back and forth along the knife edge to make a second mark on the blade surface.

Lift the rotor off, flip it over, and see where the two marks you made intersect. You've just found the CG, the spanwise balance point and the chord-wise balance point. Repeat the procedure on the other blade, then compare the two rotors. Cheap and effective.

Dave
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01-14-2006 02:54 PM  13 years ago
Butch

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New York

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Tape End Position
As you begin to wrap, position the tape on rotor blade so that when youre done wrapping, tape's end/edge is facing in the "Opposite Direction of Blade Rotation"(toward blade trailing edge).
The Whirlybug Bit Me!
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01-14-2006 06:33 PM  13 years ago
Tioli

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Kona, Hawaii

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Some one earlier said something about using lead weights. How's that?
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01-14-2006 07:01 PM  13 years ago
janked

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Spokane, WA

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I've been using the Monokote without the sticky back about a year for tracking purposes. All you do is cut it to so that it will only wrap around the leading edge. You don't need to overlap the trailing edge. Then clean the blade, remove the clear protective backing and spray the Monokote with Windex glass cleaner. Apply it, squeegee out the Windex with your fingers and let it sit overnight. So far, it shows no sign of peeling off on any of my blades.

David
"You can observe a lot just by watching." Yogi Berra
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01-16-2006 05:50 PM  13 years ago
Rafael23cc

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Junction City, KS

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💎Sustaining Member
Lead Weights
I mentioned the lead weights. If you have seen wood blades before, you would know what I'm talking about. Basically you cut a groove on the hardwood part of the blade and glue the lead strip in. You have to consider the span CG and the chord CG to be able to do this.

I retrospect, It was way too much trouble for the life of the blades. (I knew that they would not last long, and for that reason, I did not spend too much money on them thus resulting on the grossly out of balance situation straight from the box)

Rafael
Keep your feet on the ground, but your eyes on the sky.
Team Heliproz.com
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01-16-2006 07:15 PM  13 years ago
Tioli

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Kona, Hawaii

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That sounds familiar, now that you mention it. I think there are lead weights in my wood Shogun blades...
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Home✈️Aircraft🚁HelicopterHelicopter Main Discussion › fuel proof balancing tape.
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