RC plane CoG finder

Finding the Center of Gravity (CoG) of your plane is something that all RC pilots have to do before maiden flight (and after !).
There are many ways to do this.
"modern" solutions require 2 scales and simple maths that can be done with an arduino or an excel sheet.

This solution is based on a single hobby scale and scrap arrows found broken in a club (Thanks Michel)

My design allows to find CoG of almost any RC planes and gliders. Origninal design was found here : https://www.rcgroups.com/forums/showthread.php?2909285-3D-printed-DLG-CG-locator-stationary. It was published in 2007 great idea !

I have changed a few things :
- capability of weighing bottom or top wings planes
- fuselage width can be adjusted
- wing cord can be adjusted

[edit] V2 model allows to use 7mm arrows and replaces the saw blade by arrows ! Files are suffixed _v2
4x hex nuts M4 are inserted into the vertical arms during printing (color change into the .3mf files). They can be used to block the arrows in place