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glorfindel, nice start on the engine. Someone on another forum was asking about Edwards compression ratio. Since you have developed 3D CAD model, is it possible for you to determine? It looks like the design called for trimming the lips of the cylinder liner to achieve equal CR's across the cylinders. I noticed the link rod holes are phased equal 72-deg therefore the CR's would be a bit different purely by stroke geometry assuming identical rods & pistons. So this trimming would make sense to achieve both equalization & specific desired CR (within limits).I cant answer your oil premix question directly but FYI I am building an Ohrndorf 5-cylinder radial of similar displacement. It uses conventional oil premix RC fuel as opposed to Edwards prescribed straight methanol & separate oil pump. My nose case chamber is sealed from crankcase with O-ring & has a splash oil bath to lubricate cam plates & planetary gears. On the rear of crankcase is the induction manifold plate assembly. Fuel mixture is drawn in from the rear carb, mists over the rear of the master rod assembly & then exits out the individual induction tube up to the head. I could provide some CAD pics if that helps visualize. Mine is not completed yet so I cant tell you how it runs. But its the same principle as his 9-cylinder. https://www.engineman.de/en/I can share details of I would have to look at Edwards oil circuit more closely to compare.
good start.I built also the radial engine based on the edwards plan. I redraw it in 3d cad and modified it to metrical.On recommendation from a experience builder I removed the oil pump. also 2 sections, 1 with regular oil in the cam section. In the other section the carburator is connected directly on the back of the 2nd section. so the methanol with 8% klotz will lube the inside. the intake for the 5 cylinders is connected on the back of the engine.do you have plans to use this engine on a model plane? regards, Timo