What distinguishes between a speed hull and a deep v hull. I ask because I know my 230 scorpion is not really considered a speed hull. It is a 21* hull with no hook and a 2 1/4" chine. The boat handles great in all types of water especially after adding trim tabs to it. Any insight on hull design would be greatly appreciated.

Anybody care to share some knowledge. I know scarabs of the same era are about the same weight and dimensions but i've been told it is a faster hull.

Deep V's are generally considered to be 22-25 degree deadrise, with the most popular being 24. Hulls in the 16-22 range are usually referred to as "modified V". As soon as you start varying the deadrise angle, or "warping" the bottom surfaces, then it's not really considered a V-hull anymore.

As a rule, high-performance boats need straight buttock lines (the sections running fore and aft), hard chines and constant deadrise over the running surface.

And I should add that even a deep V hull with 24 degrees of deadrise can be very fast. The big thing more deadrise gives you is rough water performance. If you have less than 22 degrees on Lake Ontario - where I do almost all of my boating - you're probably going to feel it.

If you take a look at other boats in your size range, one of the fastest per hp is the 22' Velocity. It is light and has a big pad. Not as good for rough water, but the boat will lift onto the pad which keeps more of the boat out of the water.

You can see the back of the pad here - see how wide and flat it is.

http://www.youtube.com/watch?v=bURWNB70s90

Of course, it's not the only way to go fast, but these things rip.

Isn't that a notch, with the pad farthur forward? notice the lower bunks on trailer.

Yupper, that's the notch you're looking at. The pad actually ends a bit further up the hull. To the OP, a notch allows one to run with the drive mounted higher on the transom - lessening drag. A pad allows even a deep V to ride up on it and again, lessen drag. Too big of a pad can make even a deep V ride like a floor jack though.

Thanks for the correction.

No problem. Nice sounding Velocity BTW.

Here's possibly a better shot of a deep V with a pad on my 22' Progression. (OK, technically it's a variable deadrise deep V, but it starts at 24 degrees.)

Here's the bottom of the 20ft'r I've been playing with for a few yrs. Not that Velocity.

And yes, you feel most waves.

http://www.speedwake.com/forums/atta...6&d=1275957383

Suks you can't include attachments here, or am I missing something ?