Screw the OB's on dinks period.
Oars, sail. or electric. Freaking auxiliary drive for the boat is enough work I don't need another baby to tend.
The batteries take a nipple once a week in most instances. The weight of the batteries to drive them is what it is. You can use smaller batteries or larger ones as you would larger fuel
tanks or smaller for your engine depending on you needs.
No gears, not injectors, no fuel
purity issues, no mixing 2 stroke fuel
, no keeping any gasoline aboard, no frayed pull start ropes, no allot of stuff. AND those batteries can supplement and backup electrical storage already aboard.
Small OBs make great secondary anchors
,,,,,,,,, they really do!