The Wright-Martin H3 was a licence built version of Hispano-Suiza’s 8F engine. To further complicate things this one has been partially converted for marine use (many were after the war) by Auto Engine Works of St. Paul, Minn.
The main parts of the model were created in CAD and 3D printed. Moulds were then created from the prints and the parts cast in plain resin or resin loaded with aluminium powder (aka ‘cold cast’). For full details of the build refer to my blog here.
I have also created an aircraft version of the CAD model and a full marine conversion with coil ignition. The former may get built, one day… The latter can be viewed here.