Great engines and looking forward to the run. For the OS (assuming it’s plain bearing) I’d use 25% castor and low nitro content fuel. Also a 9x5 prop. For the Saito
Acording to manual Saito FA-115 range 14x8 to 14x10, 15x6 to 15x8 or 16x6, something like most 120 engines, that OS 29 Is a jewel, let see what info i can find abouth that engine.
I found a review by Adrian C Duncan in model engine news and another more complete in his web site, mostly on the gas ignition but almost at the end talks abouth the glow version test using 10x6, 11x4 prop with some RPM figures.
