After the longest winter in my life, splashdown date was tuesday for some prop testing. As some of you know, I bought a 223 last December and got to go out twice before winterization. The boat saw a top speed of [email protected] in December with a Hydromotive 4-blade 23P and about 50 gallons of gas. The motor is a Merc 454/425 with a little bigger Ultradyne cam and Gil exhaust. I'm thinking about 460 to 470 HP. The Mercury website suggested a Mirage Plus 25P so I bought one to try. Here is the results. Any help would be welcomed
All speeds are GPS- about 3.5 less than the speedo reads
25 Mirage Plus
3000 RPM = 40.7
3500 =49.8
4000 =58.6
4400 WOT =64.2
23 P Hydromotive 4 blade
3000 RPM =35.1
3500 =43.7
4000 =52.4
4500 =61.3
5000 WOT =64.7
Both tests were done with a full tank of gas (79 gallons) and just me onboard (200 lbs.) plus a cooler

All speeds are GPS- about 3.5 less than the speedo reads
25 Mirage Plus
3000 RPM = 40.7
3500 =49.8
4000 =58.6
4400 WOT =64.2
23 P Hydromotive 4 blade
3000 RPM =35.1
3500 =43.7
4000 =52.4
4500 =61.3
5000 WOT =64.7
Both tests were done with a full tank of gas (79 gallons) and just me onboard (200 lbs.) plus a cooler