top speed estimator
 

Ok, someone posted a web site that enabled some calculations to estimate top speed, using a hull factor, HP, and weight. It also had the slip calculations. I was sure I bookmarked it, but cant find it. Anyone know of this??

thats it
 

Thanks, and now while re-saving it and found out that I did have it. It shows up as "mercruiser parts at BAM marine" which did not sound familiar. I guess I have too many sites saved for my own good. Its not what you know, its knowing how to find the answer, and I failed on both accounts!!

So, you got something planned for your boat? A little horsepower upgrade maybe? Or you thinking about that 34' Mach1 still?

Shorty

no changes to the current one. I did test drive an Envision yesterday. 32' with single 496HO. I wanted to see how the salesman's claim compared with the speed calculation. I found pretty good coorelation with that web page's formula and my boat.

Yep, when I add in the weight of boat + people + gas + a 100 lbs of beer & junk, I find it to match my GPS exactly. Unfortunately, I have to use the slow v-hull constant. :(

But if I had to guess, that 32' envision with a single 496 will be lucky to hit 50mph with 4 people and a half tank of gas.

who is going to carry the Mach1 now? anyone at the lake?

That Envision sure rode nicely yesterday, hardly ever felt the rough water. :D

But, if everyday was like yesterday I would be looking at a ski boat instead ;)



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with the single, its lighter than the typical 32 (6500# ish) so using 7300, 425HP the calc says about 54mph. Dealer said about mid 50s, fairly honest guy I guess. I usually think of madatory twins at 30" or so, thats why I am especailly glad I drove it.

So it must have the 496HO not the regular 496. A whippled 500efi would probably move that along real nice. :)

I don't know who's going to carry the Mach's down there now. I have seen some used 34's with twins for sale though. But, then my opinion is slightly biased ;) You could order direclty from the Baha Cruisers factory in Florida I suppose. Might even be cheaper.

Shorty

Only problem with that gizmo is that it leaves out certain critical variables, to wit:

1. Place where the analysis is taking place, and
2. Number of liquid refreshments consumed

It is a well known fact that any boat is faster at the dock than out on the water, and that this speed differential increases with the number of boat sodas consumed.

A similar effect is seen with water conditions. This explains how an 18' boat with a 4.3 v-6 can run 75 mph in 10 foot seas when you're sitting behind 4 empty bottles at the bar ;)