I'd guess you could get complete Prime drive train from wreck for about $10-15K, which is peanuts. No reason you couldn't make custom water-jacket exhaust, once out of the car. Current Prius engines are rated at over 40% thermal efficiency, so I guess that is why they aren't doing diesels. Prime can use its big traction battery for AC household voltage but only for Japanese market (so I guess its 220). If it was a motor-sailor you'd have re-generative power when under sail. To adapt a FWD unit to prop shaft I guess you could run the prop shaft parallel to the FWD shafts and place a gear between them so both FWD shafts think they are on a straight road. The idea would be to find cheap PDT from wrecked Primes, since there wont be a market for these newer units as replacements for worn out cars for a few years still. You could rig it so you run either both engines, or one engine, or "EV Mode" but still drive two props. Prime is rated at 121hp when engine (direct to mechanical CVT) and two electric motors are combined, so two Prime Drive Trains would be in your ballpark. I did read somewhere they were thinking about diesel Prius but haven't heard since. I'm thinking my Prius Prime would be nice system to convert for boat use, mostly because it would be neat to be able to cruise at low speed without the motor running. "These have integrated control and management systems, which has long been the bugbear with these systems." Why not adapt a well proven and recently upgraded system with already a billion dollars and decades of IC and MS perfection built in, with all sorts of bells and whistles like Radar Cruise Control, and after market $1000 add on Full Self Driving (just hook the electric steering to the rudder, might need to make a little diorama of a road for the camera to look at, sitting on a big compass lol) ?
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