Examples of sailcats that sail in the teens and motor at 10 knots?. Many Chris White designs, Malcolm Tennant designs, Gunboats, Eric Lerouge designs etc. Because of changing EPA regs. diesels today are very clean burning, even without common rail technology employed, however with any of the hybrid options you have a diesel engine running pretty much continuously, the DC systems wont run usually more than an hour or two unassisted, and the ac systems are supplied direct power from the generator with no battery bank. So one big diesel running for the hybrid, or two smaller diesel running for the non-hybrid?