Just got back from Yellowstone. Wind, Snow, Rain, not the place to be. Put 17 hours on 115 Honda in 2 and 1/2 days of mostly water. 15" prop maxed out at 5125 rpm's. 30 mph at 7730 ft elevation. That prop may be very good sea level. WOT is 4500 to 6000. I'll think about it when my brain is...