87 Yamaha 115 on a 79 Steury

[Tommygreeneyez]

Ok, well I got the boat with new to me motor on today, and took it out for some runnin around. Seems to be runnin good, WOT is about 6100rpm and with 1 other person onboard I was about 37 mph. The boat again is a 1979 Steury 18 footer. The prop they put on is a 15 1/4 X 17 and this is a new prop they got for my boat after installing the motor. I did some prop wizard things online and was getting like 13 3/4 X 15 for speed or a 14 X 13 for watersports for the right prop, whitch confuses me because I am at Max WOT RPM with the 17 pitch prop. does the speed and RPM look okay for the motor and boat or should i go back to them and get a different prop on it?

The Motor is a

1987 Yamaha 115 115ETLH
and the boat is

1979 Steury 1900 (18') bowrider.