When the water is being released at the dam in the spring I'd guess north of nine knots. Wind can play a big role as well. I have a Mercury. Would a 20 horse be too much?
I don't fish and don't have a 25, so I really can't say. There are plenty of 25 owners here, so I would hope some of them would chime in here with some good info for you. My guess is that somewhere between a 10 and 15 would do, and I would lean towards the 15.
Seems to me that spilling enough water to get a 10 knot current would be considered excessive and even dangerous.
Harvey SleepyC :moon
5 knot tidal flow just coming in to our Sequim Bay
The 9.9 on my 25 works well, and can push me up to about 5 or 6 mph. That is hull speed. I don't believe any reasonably sized "kicker" will push you much over hull speed. If you need to push above that, you should probably be running your main engine! Colby
You what a "high thrust" outboard. 8 hp, 9,9 hp is plenty. The high thrust should have a larger and lower pitched prop, with a lower gear ration in the lower unit. These are often sold as sailboat kickers which acts as an auxiliary motor.
All you can expect is a speed in the 7 to maybe 8 statute miles per hour.
I looked it up, while the average knots for river flow is north of 1-like it is currently (no pun intended) the high flow in spring flooding can roil the water between 6-7. And yes....it can be challenging to hold a position in that. Smaller boats do it with ease. But that is the extreme not the norm. I'm happy to hear a 9.9 can handle it. Cheaper to buy and lighter on the back end. Thanks. You guys are always helpful.
I looked it up, while the average knots for river flow is north of 1-like it is currently (no pun intended) the high flow in spring flooding can roil the water between 6-7. And yes....it can be challenging to hold a position in that. Smaller boats do it with ease. But that is the extreme not the norm. I'm happy to hear a 9.9 can handle it. Cheaper to buy and lighter on the back end. Thanks. You guys are always helpful.