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I used the GPS with the new 13.25 x 15 prop I bought for the 360 CM with 260 HP and at WOT she ran 30 mph at 4700 rpm.
Then I took the 15 x 16 that came with the 73 Lancer I bought, put it on and at WOT she ran 30 mph at 4,100.
If you remember the boat came with a 15 x 17 and the motor could not get past 3,800.
When I had the 13.25 x 15 on her and with six full size adults, she ran smooth and strong.
I'm wandering how she will run with six adults and the 15 x 16?