Reply With QuoteMoving a full 24 inches forward without some slip could hurt someone.
Nice link.
I figured it would be alot less typing this way.
Moving a full 24 inches forward without some slip could hurt someone.
Okay thanks for the info guys great work. Lemme throw one more at ya. How can I tell if my boat will handle a 26p?
I think the HO is 5150.
Giving an average prop slip of 40% then he would have a max speed of 70.22 mph
Okay thanks for the info guys great work. Lemme throw one more at ya. How can I tell if my boat will handle a 26p?
Easy. If you are at 4800 out of 5150 RPM. You are overpropped already. I was in the same boat (no joke intended) as mine came with a 24 on it. I was at 4850-4900. Went to a 22 prop and went right to 5100 and up a few mph. Try a 22. If you hit the limiter (5150) then you need a labbed 24.
I am gonna check I might have been mistaken with the 4800 rpm thing. I am gonna run it this memorial and see what happens. Find out what the rpm truly is at. Boat load won't affect RPM correct? If I am at 4800 I will need to go down in prop if I am hitting 5150 then I will need to go to a 24p??
I am gonna check I might have been mistaken with the 4800 rpm thing. I am gonna run it this memorial and see what happens. Find out what the rpm truly is at. Boat load won't affect RPM correct? If I am at 4800 I will need to go down in prop if I am hitting 5150 then I will need to go to a 24p??
Yeah, a heavy load will knock a little RPM off. Load the boat like you are going to run it, though. Don't cheat by leaving only enough fuel for one run and leaving everyone standing on the dock.
WOT and trim it up until the RPM raises a little. You will feel the boat "air-out" and run a little smoother. Let it settle a few seconds and see what the RPM levels out at.
If you HAVE A 24 NOW, and you are stable at 4800 - you could either have it labbed down to a 23-ish or just go with a stock 22. Although a stock 22 would probably put you into the limiter or right at it.
If you HAVE A 26 NOW, then you would need a labbed 26 down to 25 or so. Or just a stock 24.
I kept my 24 after buying the 22. Gives me an extra prop just in case, and also if I add a few more HP, the 24 would be just right and I could keep my 22 for high altitude or just that nice bottom end punch.
Giving an average prop slip of 40% then he would have a max speed of 70.22 mph
You must mean 4%
You must mean 4%
OR maybe 14 on the high end? Maybe 40% if it's tied to the dock
I am gonna check I might have been mistaken with the 4800 rpm thing. I am gonna run it this memorial and see what happens. Find out what the rpm truly is at. Boat load won't affect RPM correct? If I am at 4800 I will need to go down in prop if I am hitting 5150 then I will need to go to a 24p??
Do you have a Smartcraft gauge on your HO? My Livorsi tach reads 300RPM higher than the Smartcraft at WOT. I'm not sure which one is correct, but the rev limiter is tied to the the computer/Smartcraft. When I was figuring out prop slip, best prop, etc. I used the Smartcraft, my GPS speedo and a handheld GPS to dial it all in. If you don't have a Smartcraft, a lot of shops have a hand held gauge that plugs into the cannon plug on the top of the engine. IMHO it is the best way to get an accurate reading on RPM vs. speed.
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