Conventional V-bottom hydronamics question..........
12-20-2007 | 07:37 PM
#22
Thread Starter
Registered
Joined: Oct 2000
Posts: 4,276
Likes: 8
From: SoCal
WHOAH Gerrard!! You opened up a can here!
There are a LOT of things that matter.
1. Weight is a bigger factor than anything.
2. The step itself is not what makes a boat faster. Its the natural pitch or trim that it places the thrust, as well as depth in the water in relation to the weight being pushed or displaced.
3. There are so many bottom designs out there, that you CAN'T generally title one as better (fast/ride/efficiency) than the other based on categorical design. You have to take into account strakes, hook, rocker, tabs, etc. etc.
4. Multiple steps are actually slower a single step; and a straight bottom should be faster. (Given ALL things equal, but how could you accomplish that?) Think of it in plumbing terms. If point A and point B are exactly 8' apart, and you have three equal diameter tubes to pour 2 gallons of water through; which one do you think is going to empty First? Second? Third?
There are a LOT of things that matter.
1. Weight is a bigger factor than anything.
2. The step itself is not what makes a boat faster. Its the natural pitch or trim that it places the thrust, as well as depth in the water in relation to the weight being pushed or displaced.
3. There are so many bottom designs out there, that you CAN'T generally title one as better (fast/ride/efficiency) than the other based on categorical design. You have to take into account strakes, hook, rocker, tabs, etc. etc.
4. Multiple steps are actually slower a single step; and a straight bottom should be faster. (Given ALL things equal, but how could you accomplish that?) Think of it in plumbing terms. If point A and point B are exactly 8' apart, and you have three equal diameter tubes to pour 2 gallons of water through; which one do you think is going to empty First? Second? Third?
Thanks for the analogy. I wasn't hoping to open up a can of worms.....just thought that it's an interesting subject! Hey, it's wintertime
12-20-2007 | 07:50 PM
#23
Thread Starter
Registered
Joined: Oct 2000
Posts: 4,276
Likes: 8
From: SoCal
Velocity, are much lighter than similar boats with the same power and size, they are usually 15-20% lighter. Thus faster.
On a personal note WOT stepps don't even matter, how much of a boat is in the water at WOT, about 20" in the rear, way past the step, however a pad can make a huge diff.
Just my 2 cents
WILL
On a personal note WOT stepps don't even matter, how much of a boat is in the water at WOT, about 20" in the rear, way past the step, however a pad can make a huge diff.
Just my 2 cents
WILL
38 Fountain - 9,800lbs
38 Cigarette - 9,900lbs
39 Nor-Tech - 9,200 lbs
38 Hustler - 8,500 lbs
39 Velocity - 8,000 lbs
In the smaller boats (under 30') the weight difference is alot smaller, if any
12-20-2007 | 08:15 PM
#25
Thread Starter
Registered
Joined: Oct 2000
Posts: 4,276
Likes: 8
From: SoCal
I couldn't say for sure, as I was getting the weights off each own manufacturers websites
12-20-2007 | 08:21 PM
#26
Registered
Joined: Feb 2007
Posts: 1,556
Likes: 81
From: Columbia S.C.
I enjoyed the thread and the various explanations on hull design and performance. I have a pad velocity and wondered how the pad would perform against multi step hulls at WOT. Thanks for the explanations guys. Merry Christmas!!!!!!!!!!
12-20-2007 | 08:27 PM
#27
Registered
Joined: Feb 2001
Posts: 1,849
Likes: 1
From: charlotte nc.
i know you did but what i have found is they all tend to lie a little about weight. some thank that heavy is stronger so they say theres is heavy and some say that light is faster so they do the same.
12-20-2007 | 09:52 PM
#28
Registered
Joined: Oct 2004
Posts: 1,499
Likes: 48
From: Newbury Park, CA
Michael
