SailNet Community - Reply to Topic

   Search Sailnet:

 forums  store  

Quick Menu
Boat Reviews  
Search SailNet 
Boat Search (new)

Shop the
SailNet Store
Anchor Locker
Boatbuilding & Repair
Hatches and Portlights
Interior And Galley
Marine Electronics
Other Items
Plumbing and Pumps
Sailing Hardware
Trailer & Watersports
Clearance Items

Advertise Here

Go Back   SailNet Community > On Board > Boat Review and Purchase Forum > Sailboat Design and Construction > stability issues by modifying
 Not a Member? 

Thread: stability issues by modifying Reply to Thread

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

Send Trackbacks to (Separate multiple URLs with spaces) :
Post Icons
You may choose an icon for your message from the following list:

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:
Please enter a password for your user account. Note that passwords are case-sensitive.
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:


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.

Click here to view the posting rules you are bound to when clicking the
'Submit Reply' button below

Additional Options
Miscellaneous Options

Click here to view the posting rules you are bound to when clicking the
'Submit Reply' button below

Topic Review (Newest First)
01-22-2012 12:26 PM
tommays 22-35 feet.

At 22 feet about 1% of the boats might be inboard at 35' its about 100%

BUT boats like the Cal 29 and J29 were built in inboard and outboard models at the same time
01-21-2012 09:45 PM
AKscooter Not so much alarm...but I usually find that there is a very good reason why things are designed the way they are. Since, I have no knowledge in this area.....well....I know others do...and they can share their concerns and experiences. Again, thank you all very much.

AKscooter in Asia...........
01-21-2012 09:40 PM
WDS123 Forgive me for alarming you - it is likely not a big stability issue for the vast majority of weekend inshore sailors on overweight cruising boats.

It will effect stability, but usually not very much.
01-21-2012 09:36 PM
AKscooter I wish I could be more specific. I am in the process of looking at boat to buy and have come across quite a few that have gotten rid of their inboard and replaced it with an outboard. Now that I am aware that it is a major factor...this will be an issue that I will take into consideration and perform significant research before buying. Again, thank you very much!
01-21-2012 09:32 PM
Faster This has been done numerous times.. probably most often on boats originally equipped with the OMC saildrive gas units, which are notoriously difficult to keep healthy.

Aesthetics aside, the outboard is going to be weight where it's doing the least good. However there's no point in dragging the deadweight of the old engine and drivetrain around - that space can be put to better use. The other issue is removing the drag of the saildrive/shaft&strut and structurally filling in those holes.

On most boats I don't think the weight redistribution is going to be worrisome, esp if you're not trying to race competitively. If you must go this route, then cleaning up the old and doing a proper job of mounting the outboard mount on the transom are of more concern, along with the limitations of a transom mounted outboard vs the inboard installation.
01-21-2012 09:17 PM
WDS123 Yes, the stability is changed. the critical question is by how much.

There isn't a simple answer, because it depends on the weight of the boat versus the weight of the respective engines, plus one would like to know distances the load is moved both in the x and y dimension.

If you give some specifics, people here could help you or at least give a rough idea.
01-21-2012 09:12 PM
stability issues by modifying

I truly tried the search engine....I am sure that this has come up forgive me in advance if I offend anyone. But can any one direct me to or tell me how to determine if a vessel's stability is altered by removing the inboard engine and replacing it with an outboard. Does one simply install the equivalent weight or is this even a consideration? This is for vessels in the range of 22-35 feet. Thank you very much.

Posting Rules
You may post new threads
You may post replies
You may post attachments
You may edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On

All times are GMT -4. The time now is 08:23 AM.

Add to My Yahoo!         
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2015, vBulletin Solutions, Inc.
SEO by vBSEO 3.6.1
(c) LLC 2000-2012

The store is owned and operated by a company independent of the forum. You are now leaving the SailNet forum. Click OK to continue or Cancel to return to the SailNet forum.