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Tuesday, January 9, 2018

Digital CG balancer

A good F3F competition plane deserves a good CoG setting, which requires the appropriate tool :) !

After testing and explaining the concept with 2 kitchen scales few months ago, and needing an excel spreadheet to obtain the CoG value, I wanted to reach the next level, and use one of the numerous digital CoG tools available on the market. Initially, I wanted to build mine and I had even printed all parts. But, I have too many thing in parallel, so I abandonned after this step, and ordered one when I saw this version, that is foldable, and personnalized ;) !
I just need to add some soft pad or rubber pad and it will be ready.

Many thanks to Kolosun Leung, and also thank you to the designer for sharing his work.


  1. Is this opensource or so? Can I build one?

    Though, I don't have a 3d printer and those are a few too many parts to ask a friend to build. Also a lot of custom hardware. Perhaps I should wait until someone commercialises this...

    1. Yes this is open source: https://github.com/olkal/CG_scale

    2. thanks for the information.
      I just saw one model in spain and it couldn't handle one of my gliders fuselage.

  2. Hi Pierre,
    Your scale looks little bit different with the folding stand-offs and attached lcd casing than the one shared on github. Can you please share the contact details for the designer?
    Cheers, Roland

    1. Hi Roland,
      I bought mine from Kolosun Leung in Hong Kong.
      Best regards,

  3. This looks like a great CG machine. Do you think it would fit a large RC warbird of 9-10kg? Thx


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