The Hull Truth - Boating and Fishing Forum

Go Back   The Hull Truth - Boating and Fishing Forum > BOATING FORUMS > The Boating Forum
Search

Notices

Random Quote: I sailed the sea to see the sea! You know what I saw? I saw the sea!
Reply
 
Thread Tools Search this Thread
Old 06-02-2007, 02:45 AM
  #1    
Senior MemberCaptains Club Member
 
Join Date: Dec 2003
Location: nanaimo, bc, canada
Posts: 2,280
Default measuring the leg length on outboards?

where do you take the measurement for the length of an outboard's leg?
e.i. what is 15" for a std. leg? 20" for long? 25" for XL?

i'm thinking about adding a kicker for my jet boat and need to figure out which size of leg for the kicker.
bc22 is offline   Reply With Quote
Old 06-02-2007, 06:18 AM
  #2    
Senior Member
 
Join Date: Feb 2005
Location: eastern shore maryland
Posts: 635
Default Re: measuring the leg length on outboards?

top of mounting bracket to the cavitation plate...
muskrat is offline   Reply With Quote
 
Old 06-02-2007, 07:32 AM
  #3    
Senior MemberCaptains Club Member
 
Join Date: Mar 2005
Location: Ms Gulf Coast
Posts: 1,136
Default Re: measuring the leg length on outboards?

its measured from the underside of the transom bracket at the C portion, to the cavitation plate.
__________________
Beware of A1outboards aka Blackbird ind , = Google
Mac25 is offline   Reply With Quote
Old 06-02-2007, 07:57 AM
  #4    
Senior MemberCaptains Club Member
 
Join Date: May 2005
Location: Pompano Beach, FL
Posts: 7,513
Default Re: measuring the leg length on outboards?

When you say kicker I'm assuming you mean an OB less than 10 hp... but when you say jet boat I also think of boats that are not made to have any significant weight hanging off of the transom...?
__________________
Cape Horn 31
Flot is offline   Reply With Quote
Old 06-02-2007, 06:02 PM
  #5    
Senior Member
 
Join Date: Mar 2005
Location: panama city fl
Posts: 1,332
Send a message via Yahoo to mirage2521
Default RE: measuring the leg length on outboards?

Leg?
__________________
Ignorance is bliss, but stupid HURTS


USCG 1600 ton Master Oceans, Master of Towing, Master of Aux. Sail. Master of Baiting
mirage2521 is offline   Reply With Quote
Old 06-02-2007, 08:41 PM
  #6    
Senior MemberCaptains Club Member
 
Join Date: Dec 2003
Location: nanaimo, bc, canada
Posts: 2,280
Default Re: measuring the leg length on outboards?

thanks for the advice and info guys!
i think i may go for a fixed bracket and a 25" XL leg for the kicker --> yami t8

bc22 is offline   Reply With Quote
Old 06-02-2007, 09:35 PM
  #7    
Senior MemberCaptains Club Member
 
Join Date: May 2005
Location: Seattle, WA
Posts: 3,132
Default Re: measuring the leg length on outboards?

Yes, you measure from the underside on the motor mount to the cavitation plate BUT, understand that in the case of kicker motors especially, the measurement will not come to a nice round number like 15 inches or 20 inches.

In the case of OMC motors I know that a 15" shaft length motor will measure about 17-1/2" and a 20" (long) shaft motor will measure about 22-1/2". This is because historically, the cavitation plate was designed to be UNDER water, below the bottom of the transom.

Interestingly enough, larger Mercury outboards have always measured shorter, even on motors they made decades ago.

Shaft length is a rough figure and every motor has the provision for vertical adjustment for installation variation and fine tuning purposes.
Tom W Clark is offline   Reply With Quote
Old 06-03-2007, 08:24 AM
  #8    
Senior MemberCaptains Club Member
 
Join Date: Sep 2001
Location: Chatham Mass
Posts: 590
Default Re: measuring the leg length on outboards?

For a kicker as long as your cav. plate is below the hull you will be all set. Not enough speed to be a problem.
GOODNYOU is offline   Reply With Quote
Old 06-03-2007, 08:40 AM
  #9    
Senior MemberCaptains Club Member
 
Join Date: Apr 2004
Location: Portsmouth RI
Posts: 4,149
Default Re: measuring the leg length on outboards?

Quote:
Tom W Clark - 6/2/2007 9:35 PM
Interestingly enough, larger Mercury outboards have always measured shorter, even on motors they made decades ago.
Shaft length is a rough figure and every motor has the provision for vertical adjustment for installation variation and fine tuning purposes.
Tom is right on the mark, Merc was way ahead of others with regard to running higher. One of the reasons why engine for engine, old Mercs were typically faster. They had better props usually as well. As many have discovered, raising height is a very effective performance enhancer. Most boat/motor combos run conservatvely low as rigged even today.
__________________

28 Carolina Classic
Yanmar 300's
Sleeper is offline   Reply With Quote
 
 
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Contender 31 Length vs 33T Length First Light The Boating Forum 2 06-09-2007 03:27 PM
Measuring boat length and beam - Proper way by a Surveyor? Dan000123 The Boating Forum 5 08-19-2005 06:47 AM
STANDUP ROD LENGTH----OUTBOARDS CAPTJohnny SportFishing and Charters Forum 19 06-14-2005 07:42 AM
Measuring prop? Big Nasty Guide Serv The Boating Forum 3 02-22-2005 08:18 PM
measuring head... how much am I getting? Blazer The Boating Forum 6 06-15-2003 05:40 AM

 



©2009 TheHullTruth.com

Powered by vBulletin® Version 3.7.6
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO 3.2.0