Top: Scratch-One's original eight-cell 1100 mAh NiMH pack. Bottom: New two-cell FMA Direct/Kokam 1500 Li-Poly pack.
Since Li-Poly battery is 3.2 ounces lighter, keep it positioned forward to help maintain proper CG position.
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Top: Scratch-One's original eight-cell 1100 mAh NiMH pack. Bottom: New two-cell FMA Direct/Kokam 1500 Li-Poly pack. |
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Since Li-Poly battery is 3.2 ounces lighter, keep it positioned forward to help maintain proper CG position. |
Q-17: I’ve already built your Scratch One electric-powered sailplane design that appeared in the November 2003 MA and it flies great! But with all the talk now of Li-Poly batteries, can I change over to these new cells in my Scratch One?
A-17: The answer is a definite yes, and I have already done so. I wrote an article published in the May 2003 MA titled, "Introduction to Lithium-Polymer Batteries." In it I show you how to replace the Scratch One's original eight-cell 1100 mAh NiMH battery pack that weighed 5.9 ounces with a two cell FMA Direct/Kokam 1500 mAh Li-Poly pack that weighs 2.7 ounces. You get a weight savings of 3.2 ounces while gaining roughly one-third capacity. Your Scratch One will weigh less and fly longer!