Jeff, thanks for the info, it'll come in handy when I get motivated to try props again.

Your rpms seem low though, the Yamaha T-1 25 should be going 6,000 rpm no problem with a full load, full gas, 1 person (this time of year maybe even more). At this rpm, I get 75+ gps. I've been really wanting to see how a Tempest 25 or a TXP 25 would do. Either way, the Yamaha tech rep recommended propping these motors at 6,000 rpms to stay in the motor's power range.