223 Prop Test Results
04-18-2002, 08:16 AM
#1
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223 Prop Test Results
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 68.7@5200 with a Hydromotive 4-blade 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 got 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
Tests were done with a full tank of gas for both props (79 Gallons) and just myself onboard (200 lbs.)
Did the heat (97) rob me of 4 MPH?
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
Tests were done with a full tank of gas for both props (79 Gallons) and just myself onboard (200 lbs.)
Did the heat (97) rob me of 4 MPH?
Last edited by craig223; 04-18-2002 at 08:22 AM.
04-18-2002, 09:51 PM
#2
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Craig,
I'm suprised the 25P didn't work better for you. Now I have to rethink my choice of props. With the stock 330 HP my 223 was running 61 on GPS with a 23P Mirage Plus. I get my new motor back tomorrow now and talking to the builder, the motor was built to make it's peak around 5400 RPM +. Considering I will be around 470 - 500 HP, I may have to look into having my 23 labbed into a 24, if your only getting 4400 out of the 25. I could see temperature having something to do with your 200 lost RPM's, but I would figure that the water temp, even in Virginia is still pretty cool this time of year (assuming the boat is raw water cooled).
I'm suprised the 25P didn't work better for you. Now I have to rethink my choice of props. With the stock 330 HP my 223 was running 61 on GPS with a 23P Mirage Plus. I get my new motor back tomorrow now and talking to the builder, the motor was built to make it's peak around 5400 RPM +. Considering I will be around 470 - 500 HP, I may have to look into having my 23 labbed into a 24, if your only getting 4400 out of the 25. I could see temperature having something to do with your 200 lost RPM's, but I would figure that the water temp, even in Virginia is still pretty cool this time of year (assuming the boat is raw water cooled).
