Handling a uncooperative boat

sschefer

Rear Admiral
Joined
Nov 13, 2008
Messages
4,530
Re: Handling a uncooperative boat

Well, your half right - I wasn't in the boat:rolleyes:

21" + 1.87:1 + 5000 = 53mph

Doesn't matter how bad***** you motor is, you will NOT get ZERO slip. 'ell just to break 50mph would mean 6% prop slip - you ain't gettin' that either.

Sure your 21" prop isn't a 27"???

No, actually I'm completely right. You have no idea what RPM's the engine was turning nor do you know the HP that that engine is capable of maintaining at max RPM's. You also do not know the weight of the boat or the type of prop I was running. You're missing the height at which the prop was running in the water and,,,, well the list goes on.. I only stated that I was trying to keep it under 5000 rpms.

I actually don't know what the RPMS were when I took it into the chine walk and throttled up topush through it, I was driving one handed if you haven't noticed and was a little busy.

I suspect you are are probably right about one thing. RPM's were somewhere close to 6500 maybe even 7000. The motor will probably go 8000 once I cut the heads.

But in my final post on this matter and this board. I will simply state that once again, a few members have done the inevitable and have attempted to discredit the writings of another poster. There's no point in it and it just ruins the entier subject of the post. This is no longer a helpful post as it was intended to be. I truly hope you're satisifed with the results of your efforts.

I'd love to see the response to this but I won't be back again.. Yep, you've achieved your ultimate goal and run another contributor off.
 

a70eliminator

Captain
Joined
Sep 9, 2007
Messages
3,762
Re: Handling a uncooperative boat

Sorry couldn't resist.
 

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sasto

Captain
Joined
Jun 1, 2010
Messages
3,918
Re: Handling a uncooperative boat

Well, your half right - I wasn't in the boat:rolleyes:

21" + 1.87:1 + 5000 = 53mph

Doesn't matter how bad***** you motor is, you will NOT get ZERO slip. 'ell just to break 50mph would mean 6% prop slip - you ain't gettin' that either.

Sure your 21" prop isn't a 27"???

I understand pitch....gear ratio....RPM..... MPH, but not that good at math. What is the formula you use to determine the % prop slip? Something I have wanted to learn. Thanks.
 
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