When you Balance the Rotor blades do you put the weight at the tip of the blades or at the Hub of the Blade? The directions tell to put the weight at the Center Of Gravity. Where is the CG on a Blade? ALso can electrical tape be used as the weight at the tip of the Blade?
Hoe to hear from you Pro's......

You want to weigh each blade seperate and find the c.g. of each blade. I usually take a black marker and make a mark on the c.g. Use a ruler on edge or a razor blade, I use my balancer. If the c.g. is more then 1 mm you need to add weigh to the end of the one blade to get the c.g. the same. Once you get the c.g. the same balance the blades together and add the weight to the lighter blade right on the c.g. and you will be ready to go. If you have someone to show you how it's done the first time it's really easy and you will understand it better. The c.g. of the blade is where the blade balances, usually just to one side of center. I have used electric tape a lot, it works just fine. I hope I haven't confused you to much.

Jason

You need a balancer. The best one is the Koll Rotor Pro, and you can get it from heliproz, etc. There are less expensive balancers out there too, but the Koll is worth every penney IMHO.

To match cg, what you do is find the point near the center of the blade (lengthwise) where it balances perfectly. You could use the edge of a ruler clamped in a vise as the balancer, and just move the blade from side to side until you find the balance point. Mark it. Mark the same point on the other blade, then put it on the ruler and see if it balances at the point where you marked it. If not (which is very likely), you will need to add some tape to either the end or the root until it balances at the mark. Now both blades will have the same lengthwise cg. Next, you have to made sure both blades weigh the same. You can use a very accurate scale if you have one, or you can put the blades on a see saw. You could make a see saw with a piece of scrap plywood by drilling holes at each end and bolting the blades to it. Mark the exact center and slap it back on your ruler--instant see saw balancer! Add tape to the light blade right on the cg mark you made before until the blades balance.

With the Koll, all of this is very easy and accurate. I use Monocote sticky back trim cut into strips for balancing tape. Works great and lasts longer than electrical tape, but electrical tape will also work.

On my tips page you can see

(1) how to build a very cheap very accurate balancer yourself
(2) how important proper balancing is
(3) how to do the balancing of both weight and COG.

http://www.cg.its.tudelft.nl/~wouter...ips/index.html