Originally Posted by Ron RC
Here is my $5 (literally)CG machine I built fashioned after the Great Planes one. If you don't glue the sections of the PVC pipe together, it is completely adjustable and collapsible to take to the field. I have my rulers setup for inches, but easily could be set to mm. The plane balances on 2 round head machine bolts. Very gentle on foam wings. I have a list of materials and dimensions and prices from a local Lowes around here somewhere if anyone is interested. I love working with pvc tubing and you may have seen my Thrust Machine I built out of PVC in an earlier post. I also used the 2 dowels in the 2x4 but the darn thing kept falling over and then went "high tech"
Ron you are a YouTube Celebrity, here is video on your CG machine (this is what I used to build it)
and this is your thrust machine