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P -

The engine does not include a prop, the dealer is selecting that prop as a guess.

There is some good performance data on the Outrage 18 and the F115:

Prop installed 13 1/4 x 19 Yamaha Painted Stainless Steel
Engine mounted all the way down.

Test results with a Yamaha 115 hp four stroke EFI on a 1988 Outrage 18, no bottom paint, motor mounted all the way down:
(Wind variable 5 kts; smooth fresh water lake; air temp 65 degrees; water temp approx 60 degrees; approx 1000 ft altitude; humidity approx 65%; on board me (210 lbs) & brother-in-law Larry (170 lbs); no RPS--it's at home all torn apart being spruced up; no live bait tank any more; 30 lbs of weights midships; two batteries in console; anchor chain & rode; 3/5 tank of gas, maybe 37-8 gallons.)

All measurements via GPS and Yamaha digital multi-function tach. No current and negligible wind, so I didn't run in reciprocal directions.

700 rpm = idle
700 rpm = 3.1-3.3 mph
1100 = 4.7
1500 = 6.2
1600 = 6.3
2200 = 8.0
2500 = 9.0
2800 = 11.4
3100 = 16.2 (barely on plane, trimmed all the way down)
3500 = 22.0
3700 = 24.6
4500 = 30.0
4600 = 31.7
4800 = 34
5000 = 36.0
5700 = 40.8-41.1