Dave - Thanks for your thoughts, and yes we bought a spare prop. However, I realized yesterday that we didn't have a 17mm deep-socket (needed to change it) on the mother ship. It's there now.A challenging question.
I think I would use the Torqeedo as the primary motor and keep the Tohatsu as a back up.
We have a Torqeedo and are generally pleased with it despite the two major shortcomings, the range/speed issue and recharging. The recharging issue is a big one, an ICE can be "recharged" quickly from a can of gasoline, the Torqeedo needs up to 10 hours. In the short time we have owned the Torqeedo we have had to balance charging with use, planning ahead for how much we can use the motor before recharging. It will sometimes interfere with spontaneity, does the battery have enough charge to get us to the impromptu gathering across the harbor and back?
If you haven't discovered it yet, the props are easily broken leaving you with a one blade or no blade prop. Learned the hard way.![]()
I have 1670 watts of solar aboard the boat, so charging the Torqueedo is a non-issue, but you're right - that 10-hour charge time is. It would be nice to have a spare battery in reserve that's always fully charged... except for the cost. If we had that we could also use the Torqeedo at wide-open-throttle without much concern about range and recovery time. I'd love to find a used one on the market that's in good condition from a little old lady who only used it in fresh water to go to church (haha).