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Posted by MachineCat | Sep 25, 2021 @ 05:04 PM | 24,812 Views
Last week the weather was not cooperative at all, especially the windy storm over the weekend. So got stuck at home and build.

Our previous flying wing got some cracks so I decided to build another one. Last time it seemed to me the hardest part was to get the CG right. I had to put the battery all the way to the nose and taped two quarters to the nose to balance the weight. I tried to move the motor around and it seemed to help but totally not enough. So I did some simple math and realized that contradicting to my instinct, the most weight at the rear end of the flying wing needed to be balanced by battery is not the motor/prop. The weight actually came from the foam itself, for the lightweight build I am building.

So I wrote some simple Python code and enumerates all sorts combination of wing span, sweep, root cord and tip cord, taking into consideration of motor/prop location, as well as where to open the slot for prop, finally decided a wing shape that would make me most easily to balance the CG with the stuff I have, as well as having a low wing loading.

The wing span is 30', AUW 185gram.
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And because I was not able to try to fly it immediately, I decided to build another one.
This one is a FT Flyer like plane. The wing/stabilizer were all cut by following the FT Flyer plan. However, to make things simple and light, I decided to skip the fuselage (or the power pod as the plan called), and just stick the two parts together with hot glue.
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