Center of Gravity Puck - Glue On - 25mm diameter
Description
In building a foamboard RC airplane, I wanted a way to be able to set my CG pins in the exact location on the bottom side of the wing, and make them stay where they are supposed to. This solved my problem perfectly! Just glue them onto the bottom of your wing where your CG marks are. If your airplane doesn't have CG marks, you can approximate a very good location for CG at 33% back from the front of your wing, toward the flaps, or rearmost edge of your wing. About 1/3 the distance of the wing chord. If your wing isn't straight, and has taper, or is a delta wing, you will have to do more research to better estimate the wing's CG. By balancing my airplane at the 33% marks, I put a scale under the rudder, and got 113 grams of weight on the tail. This was before adding the engine, battery, ESC, and receiver. Measuring from the tail to the CG gave me 29 inches. So, 113 @ 29" = 145 @ X". 145 grams was the weight of my motor, battery, ESC, etc. Solving for X gave me 7.364" So @ 7.364" in FRONT of the GC marks, the airplane will balance. And it did. I like a slightly heavier nose, so I put a strip of velcro under the battery to make it adjustable forward and aft. Slight adjustments to CG can be made that way.
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