whats the difference...ballast - SailNet Community
 
LinkBack Thread Tools
post #1 of 5 Old 06-28-2010 Thread Starter
Senior Member
 
Join Date: May 2010
Posts: 146
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 6
 
whats the difference...ballast

both boat 24ft one is 6000displacement and 1500ballast the other boat is 4000displacement with 2000 ballast. how those it compare?
jobi is offline  
Quote Quick Reply Share with Facebook
Sponsored Links
Advertisement
 
post #2 of 5 Old 06-29-2010
Banned
 
Join Date: Apr 2006
Location: MS Gulf Coast
Posts: 711
Thanks: 0
Thanked 3 Times in 3 Posts
Rep Power: 0
 
One quick stab here involves ballast/displacement ratio. They are 25% and 50% respectively. Higher b/d ratios would tend to indicate a boat that would more quickly right itself after a knockdown. However, being a ton lighter, it might be getting knocked down more often. It's just one measure of how a given boat will perform.
seabreeze_97 is offline  
Quote Quick Reply Share with Facebook
post #3 of 5 Old 06-29-2010 Thread Starter
Senior Member
 
Join Date: May 2010
Posts: 146
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 6
 
ok here where I dont get it, the boat with lower displacement has a 50% ballast/displacement ratio, a lower centre of gravity.

the other boat has much more wieght above and is alot less ballested, logic would sugest this boat to be easyer to knockdown no?

I understand that hull design, beem, WTL all play an important role in how seaworthy a boat is, but given both these boats have similar beem and water lines shouldent the lighter boat be safer in bad weather?

in this case the 6000lbs boat was designed by guy thompson as a sea cruiser, he actualy built this boat as the best possible design for his personal needs (the boat got marketed leter on). the lower displacement boat is a mc-gruger challenger 7.4 and is said to take sirrious winds.

I find both these boats interesting, but I am intriged about thire displacement/ballast ratio and how it works.
rgds
jobi is offline  
Quote Quick Reply Share with Facebook
post #4 of 5 Old 06-29-2010
Senior Member
 
tommays's Avatar
 
Join Date: Sep 2008
Posts: 4,296
Thanks: 1
Thanked 30 Times in 30 Posts
Rep Power: 7
 
It would really depend on were the ballast is

You could have a HUGE amount of oldstyle internal that would not do as much as a new style bulb on a 7' keel

1970 Cal 29 Sea Fever

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

1981 J24 Tangent 2930
Tommays
Northport NY


If a dirty bottom slows you down what do you think it does to your boat
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
tommays is offline  
Quote Quick Reply Share with Facebook
post #5 of 5 Old 06-29-2010 Thread Starter
Senior Member
 
Join Date: May 2010
Posts: 146
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 6
 
the thompson has a deep fin keel 4.5ft I think?
the challenger has a longer and short fin keel

the challenger has always been a favorit of mine as I cauld put legs on it and use it at low tide like one uses a bildge keeler. because the keel is flat and very strong.

anyway I optained the thompson so my questions ar purly inquisitive.
jobi is offline  
Quote Quick Reply Share with Facebook
Reply

Quick Reply
Message:
Options

By choosing to post the reply above you agree to the rules you agreed to when joining Sailnet.
Click Here to view those rules.

Register Now



In order to be able to post messages on the SailNet Community forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
Please note: After entering 3 characters a list of Usernames already in use will appear and the list will disappear once a valid Username is entered.


User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Forum Replies Last Post
MacGregor 26 vs. ? jiml2p Boat Review and Purchase Forum 207 06-22-2015 03:38 PM
Mechanical difference between roller furling and reefing? duffer1960 Gear & Maintenance 6 10-26-2009 09:46 AM
What can you tell from the numbers? brazilnut Boat Review and Purchase Forum 10 07-01-2009 04:09 PM
biologists looking for assistance teambenthos General Discussion (sailing related) 12 06-01-2004 12:59 PM
Internal Ballast vs. External Ballast windship General Discussion (sailing related) 3 09-15-2002 04:33 PM

Posting Rules  
You may post new threads
You may 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 On
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome