Balance Scales
thingiverse
These are balance scales used to find the center of gravity of small model airplanes. Getting the CG right is vital for a good flight. Here is a video of the scales in action: https://youtu.be/kgzV5Q67iao Here is a link to the full build instructions: https://www.flyexpresswings.com/post/how-to-find-the-center-of-gravity
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