Regarding your Walter V-Drive, this is probably an RV-10 and, if so, it does not have a pressurized oil system. Simple oil fill. There would be a cooling hose attached and run in line with the Yanmar cooling. And you probably don't need that as the V drive in your application will probably never generate excess heat. That RV-10 is rated for 50HP if I recall? And that's the smallest they made.
Dan Pfeiffer
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And then I still have the friction losses of the v-drive and it's pressurized oil system, the cutlass bearing, etc. For reference the prop drawn in the original drawing is 17" diameter.
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