Go Back  Offshoreonly.com > General Discussion > General Boating Discussion
Why don't you ever see extension boxes on the fast (120+), stepped vees??? >

Why don't you ever see extension boxes on the fast (120+), stepped vees???

Like Tree43Likes

Why don't you ever see extension boxes on the fast (120+), stepped vees???

Reply

Old 01-15-2015, 05:12 PM
  #1
Registered
Thread Starter
 
Join Date: Oct 2005
Location: Plainville/Old Lyme, CT Boca Raton, FL
My Boat: 50 Turbine Mystic
Posts: 5,539
Default Why don't you ever see extension boxes on the fast (120+), stepped vees???

You see a lot of boxes on older straight bottom stuff but never on the bigger, stepped, #6 boats. Why is that??
302Sport is offline  
Reply With Quote
Old 01-15-2015, 05:18 PM
  #2
SB
Registered
iTrader: (1)
 
Join Date: Nov 2004
Location: On A Dirt Floor
Posts: 9,406
Default

Compared to the hull bottom (running surface) they are already raised and set-back ?????

BTW: that's a guess from me as many boats with steps, after each step (going torwards the transom) the hull raises.

Looking forward to the real answer.
SB is offline  
Reply With Quote
Old 01-15-2015, 05:21 PM
  #3
Platinum Member
Platinum Member
iTrader: (1)
 
14 apache's Avatar
 
Join Date: Apr 2005
Location: Northport N.Y.
My Boat: Starchaser 87 Apache 41 Warpath
Posts: 1,801
Default

Originally Posted by 302Sport View Post
You see a lot of boxes on older straight bottom stuff but never on the bigger, stepped, #6 boats. Why is that??
43' outerlimits on long island has a drive box don't no how much it did for performance. But I thing it runs better than the sister boat handling wise.
14 apache is offline  
Reply With Quote
Old 01-15-2015, 05:26 PM
  #4
Registered
Thread Starter
 
Join Date: Oct 2005
Location: Plainville/Old Lyme, CT Boca Raton, FL
My Boat: 50 Turbine Mystic
Posts: 5,539
Default

The reason I am asking is because I can't recall ever seeing a newer 1075/6 or 1350/8 setup with boxes from the factory. Just wondering the real answer, as I am sure if there were gains to be had, the new boats would be rigged with them.

I am re-rigging my boat with different drives and Im loosing about 8" of setback. I am wondering if it is worth adding setback to get back where my #6's on 12" boxes used to be or leave it alone.

Last edited by 302Sport; 01-15-2015 at 05:28 PM.
302Sport is offline  
Reply With Quote
Old 01-15-2015, 05:27 PM
  #5
Platinum Member
Platinum Member
 
Too Stroked's Avatar
 
Join Date: Apr 2010
Location: Rochester, NY
My Boat: 1992 Progression 22
Posts: 1,795
Default

Remember, extension boxes (or setback on an outboard) is designed to give the drive more leverage to lift the bow. Lifting the bow on a non-stepped V-bottom was about the only way to reduce the wetted surface area, and thus drag, to increase speed. Steps changed that by lubricating the bottom with air bubbles. Doing this eliminated the need for excessive trim to gain speed. So a step bottom generally doesn't need much leverage to lift the bow. Of course the tiny bubbles created as many problems as they solved. Just ask Dean Martin.
Too Stroked is offline  
Reply With Quote
Old 01-15-2015, 05:33 PM
  #6
Platinum Member
Platinum Member
iTrader: (1)
 
14 apache's Avatar
 
Join Date: Apr 2005
Location: Northport N.Y.
My Boat: Starchaser 87 Apache 41 Warpath
Posts: 1,801
Default

Originally Posted by 302Sport View Post
The reason I am asking is because I can't recall ever seeing a newer 1075/6 or 1350/8 setup with boxes from the factory. Just wondering the real answer, as I am sure if there were gains to be had, the new boats would be rigged with them.

I am re-rigging my boat with different drives and Im loosing about 8" of setback. I am wondering if it is worth adding setback to get back where my #6's on 12" boxes used to be or leave it alone.
One other thing more of a PIA when rigging the boat long drive shafts needs a two piece shaft to eliminate whip. Think it would be better all around with a box handling wise.
14 apache is offline  
Reply With Quote
Old 01-15-2015, 10:17 PM
  #7
Registered
 
Join Date: Jan 2012
Posts: 145
Default

I had rerigged the drives on my OL as 14 apache had stated. It was a great advantage for me, for many reasons. I think the reason most boat manufactures don't install them is the cost vs the gain that they may see. I have bin amazed at the way most boat manufactures give there boats to there customers the set ups are horrible. I would put boxes on the boat the benifts outway the negitives.
43sv is offline  
Reply With Quote
Old 01-15-2015, 10:31 PM
  #8
Registered
Thread Starter
 
Join Date: Oct 2005
Location: Plainville/Old Lyme, CT Boca Raton, FL
My Boat: 50 Turbine Mystic
Posts: 5,539
Default

The cost part of it is crazy to me as it is almost negligible on a $500k-$1M boat. What did you gain when put the boxes on?
302Sport is offline  
Reply With Quote
Old 01-15-2015, 10:43 PM
  #9
Registered
Platinum Member
 
Join Date: Jan 2006
Location: wisconsin
My Boat: 42 Fountain, 30 Profile
Posts: 689
Default

Reggie Fountain was asked the question... His answer was " if they would run better with them, we would have installed them" he said that they look for every bit of advantage, but if a boat needed a box, they should have that all figured out before they made the mold. That being said, its not to say on some boats manufactured... boxes don't help. But the companies that cared mostly about speed would have designed it into there mold like Reggie said.
Bawana is offline  
Reply With Quote
Old 01-15-2015, 11:41 PM
  #10
Registered
 
Join Date: Sep 2007
Location: Tampa
My Boat: 36 Concept / Y2K Superboat/39 Nor-Tech/. 40 MTI
Posts: 1,200
Default

Statement 42V's have extension boxes on there boats.
boating37 is offline  
Reply With Quote

OSO Sponsor
OSO Advertiser
OSO Advertiser
OSO Advertiser