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  Topic Review (Newest First)
01-15-2013 03:37 PM
John Y. Jackson
Re: I30 Mark II Profile Drawing

I thought I posted this last night, but I do not see what I wrote then. If it is here twice, my apologies.

Three things that may help with the difference between the I 30 MK II and the I 30 Bahama:
1. The 30 has a slightly different rig dimension. I am not sure what it is, but I know when I was getting a new main made several years ago one place sent me dimensions that were wrong, then I noticed they had I 30 Bahama, even though I had said I 30 MK II. I did not have them do my work.
2. The I 30 Bahama is lighter. I don't know if the hull is thinner or what, but it displaces a little less.
3. It is my understanding that the I 30 was made "off shore." The plant in California closed and in an effort to keep making Islanders production was moved to the Caribbean or Latin America, I'm not sure which. (Maybe that is where the name "Bahama" came from.
Hope this helps.

John on Aquila Sail 462
01-14-2013 09:24 PM
Re: I30 Mark II Profile Drawing

You can find all the facts and figures, including rig dimensions, for all the I30 models at They confirm what John was saying.

Interestingly, I had not noticed the I30-2 TM model previously. It appears to be the I30-2 hull set up with a rig almost identical to that of the I30-Bahama. The foregoing hyperlinked names lead the the associated pages where you can see for yourself.


UPDATE: Faster, you beat me to the punch while I was typing.
01-14-2013 09:11 PM
Re: I30 Mark II Profile Drawing will have the rig dimensions for both as well.. plus other similar sites.
01-14-2013 08:18 PM
John Y. Jackson
Re: I30 Mark II Profile Drawing

It is my understanding that the Islander Bahama 30 was very similar to the I 30 MK II except for three factors:
1. It was a little lighter.
2. The sail area is a bit different. I know the main sail is different, perhaps Bacon Sail has rig measurements for both.
3. I also believe that the Bahama designation was given when Islander moved its production facilities from California (Coasta Mesa?) to somewhere in the Caribbean or Latin America, I'm not sure which.

I should add that Aquila, Sail 462, my I 30 MK II was built 1974-75. Commissioned in Duluth, MN. We knew the original owner and purchased it in 1985 and have had it since. A great boat.

Hope this adds some clarification, not confusion.


01-13-2013 03:08 PM
Re: I30 Mark II Profile Drawing

So it wasn't me who was confused!

I do think that's it.. There's an older Islander 32/33 that's probably a McGlasson design as well.

While Finch did the 1970 model it's possible someone else retooled and tweaked the design, and redesigned the keel and rudder, likely modified the deck/cockpit molds as well. Could even have been done in-house by Islander. Looks like it could be the same basic hull though.

OK so now we're all on the same page! btw is your friend!
01-13-2013 02:48 PM
Re: I30 Mark II Profile Drawing

Your confusion has clarified the issue for me!! I did not realize that the "McGlasson" I30 was the original, older design, I've never seen one of them. So although Finch designed both the I 30 Mark II and the Bahama, they are quite different boats both on deck and below, as well as underbody. Thank you for the information! I knew someone would have it sooner or later!
01-13-2013 01:26 PM
Re: I30 Mark II Profile Drawing

Now I'm confused:

This is the McGlasson I-30:

Even though there's no underbody profile it's difficult to believe the underbody here is going to be anything like the MKII images posted by John - in fact I'd strongly suspect its a full keel/attached rudder..

Clearly the MKII above, and the Bahama 30 below:

It seems logical that the McGlasson 30 (top) is the 'original', the 1970 Finch the 'MKII', and the B-30 a refinement of the Finch boat as they are very similar to each other in many ways (similar hull/deck, but new foils)....
01-13-2013 12:47 PM
Re: I30 Mark II Profile Drawing


Thanks so much for these drawings! With the sail actually showing the Mark II designation I have to take these as gospel at the time. Too bad there is no year listed. Interestingly, the underbody is identical to the Islander 30 and not the Bahama 30. I have my suspicions that the Mark II is simply a development of the original Islander 30 designed by McGlasson, not by Bob Finch. Research continues.....
01-13-2013 10:02 AM
John Y. Jackson
Re: I30 Mark II Profile Drawing

Yes, I have interior and exterior. I just took pictures of both, and think they are attached to this. Note, the interior one shows the Dinette arrangement, however, some, mine included, did not have this, it has a fold down table on the bulkhead and couch/settee on both sides.

John Y. Jackson on Aquila, I 30 MK II sail number 462
01-08-2013 10:44 PM
Re: I30 Mark II Profile Drawing

Originally Posted by bvermeer View Post
Interesting! Sure looks like a Bahama. It's too bad the underbody isn't outlined, that would be the definitive view. Thanks for the info, I will add it to my collection.

Bert Vermeer
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