I owned a 1969 C 26 same as 25, when my atomic bomb died I strapped a 6 hp on the back and it worked a charm. I ended up sailing that boat form San Diego to the Sea of Cortez what a trip. Now I sail a 8,000 boat with a 6hp 4 stroke. I live in the San Juan Islands where we have massive currents and I have zero complaints. Just for example I wanted to test it so when we found our selfs in 20 knots of wind in a wind over tide rip we dropped all sail and at a little over half throttle we made 2.4 knots. BTW the C25 is amazing yacht good luck to you.