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??

http://www.go-fast.com/boat_speed_predictions.htm

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.

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