Sabre602 wrote;
“Duplicating the single engine in a twin-engine configuration doubles not only internal friction losses (cylinder walls, rod bearings, valve trains, etc) but also adds new losses in a second gearbox, shaft and prop.”
Why would there be added losses? One would assume trying to approach apples and apples an appropriately smaller gear, shaft and prop. Seawater pumps, cyl walls, rod bearings valve trains ect ect would all be 1/2 the drag of the bigger single engine. So both should have very close to the same % of loss per hp.
But I’ve never seen or heard of a comparison that involved 2 boats and engine combinations that would yield an actual apples to apples comparison.
Thanks for your very excellent post #25. Hope you become a long time poster and member.