I'm working backwards from a hangar 9 supplied wood gas motor mount to determine a engine thrust line on a US 120 firewall.

Could someone furnish the prop shaft axis location in relation to the 3 bolt mount that comes with G 23 engine?

The US 120 construct/instruct manual shows a G-23 mount with the cylinder head down and the mount to the wood firewall with a 'top' centered mount bolt on port/strb center-line. I can get at least an idea where it intersects on the vertical with the requested data.

Building an Alum mount to hang a Ryobi 31 cc

mikenlapaz '1000 miles to the LHS'