Originally Posted by sluissa
My LWL is about 20. divided by 2 is 10. However, I get along fine with a 6HP outboard. Gives me more than enough power. The boat is designed to handle something closer to a 3.5HP outboard. So... I guess my boat is weird, or that formula doesn't scale down well.
It's not designed to be a rule
. I use it for a starting point. That way I keep from putting an 80hp in a 38' IP. Like I said earlier. I also round up, add for alternators, refidge compressors, water
maker pumps. Then add the human factor and normal cruising grounds.