Mine are 200 RPM's off, have been like that since break in. 100 hours later, still the same.

Pretty cool stuff you calculated! I can not believe they are off in rpms like that. Have you tried to send the props out to adjust for that? One more thing, please tell me how you can make a earning career out of boat racing. I always heard the only way to make a small fortune in boat racing is to start with a large fortune . Good luck with the boat.

Extremeskater has the same boat, same power, and he has 200RPM off.

Marylandmark has a concept with the same motors, he has 200RPM off.

We tried 5 different sets of props, see post #129, this thread, and the 15x32 3 blade cleavers, labbed, are the ones my boat likes.

I never said I made money racing, it was just what I did. If I could make money racing, I would still be racing. I made tons of money doing the engineering thing, before racing, spent obsene amounts of money doing the racing thing. Racing was great, but it was not cheap.

They were just Mercury labbed props? Or did you send them to someone? I have had good luck with Brett at bblades. I would think he could get them to run the same. Has anyone asked Mercury what is the reason for the rpm difference?

My current props are Mercury 15 x 32 , 3 Blade cleavers, labbed. I sent them to Brett at BBlades asked him to tweak the starboard prop to put more cup in it to bring it down in RPM to match the lower reving motor(port). Mine is still off, 6000 port, 6200 starboard.

I've heard from several Mercury guys that it is common to have one motor stronger then the other. Even if I got another 200 rpm out of the weaker motor, I would gain minimal speed. I'm convinced these 30 Skaters with 300XS are 102mph boats, period.

I have heard the same. I just thought it was funny 3 boats were all about 200 rpm off. 102 in that boat is still great with those motors. I think its proven they are not nearly what the 300x motors are. I wonder how they compare to the older 300 promax's?

Is there a possibility that the different way thrust is handled in the L.H. verses R.H. unit costing the 200 rpm? Don't have a clue, just trying to learn.

Three of the five props we tried, we had custom made and labbed by Mercury Racing Prop Lab.

Two of the props we tried, were borrowed, and I do not know who worked them. I beleieve that one came form Gary Ballough, and one came from Dan Lawrance.

Both myself, and Chris at Skater, have been trying to get answers from Mercury Racing since May 2007.

Thats a really good question. At one time we were spining out. Now we are spining in. Does not seem to matter.

If you look at my data in post#153, this thread, you see that of the 4 wot runs; in 2 the PORT was slower than STBD, and in 2 the PORT was faster that STBD. All of these runs are with the props spining in.

Brett and Bblades is the Prop God!

The 300xs stops making is HP at 6150 and then it starts retarding.

The 300xs has several components that can cause irregularities in performance.

1. The exhaust seems to be directed towards the wing plate causing a reverb problem which directs water into the back of the cowling. It may seem barbaric but place a rubber tube in it and direct over the wing plate this will help.

2. AT wot I have found that you need 18lbs of water pressure for the computer to keep the power on.

3. The Rpm's on the cat are commonly affected by crabbing. Sometimes to keep the boat straight it requires a slight turn of the wheel this will reduce speed and rpm's on one side.

4. Depending on hours the Aircompressors output may affect top end performance.

Bottom line is that the 300xs requires larger props than 34's to get all the performance out of them. They are however very user friendly and reliable. You put a set of 300x's on the 30 skater and hold on brother.

Like I said my boat has slowed down considerably with the xs.

Brett will be making me a custom set of wheels (36") very soon and you may try them if you wish.


Dan