Author Topic: GA 28 built by Kachemak Skiffs Wasilla, AK  (Read 8512 times)

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Brian.Dixon

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Re: GA 28 built by Kachemak Skiffs Wasilla, AK
« Reply #150 on: November 06, 2019, 03:11:34 PM »
That swim platform is awesome!

Yes ... the most fantastic and detailed setup I've seen yet, and all bristol work!  (I like that word ... bristol, very marine, very nice, very Alaska :D :D.  I like yeoman, as in "yeoman's work"  :D  )

bd

« Last Edit: November 06, 2019, 03:13:47 PM by Brian.Dixon »
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Dan Boccia

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Re: GA 28 built by Kachemak Skiffs Wasilla, AK
« Reply #151 on: November 06, 2019, 07:39:34 PM »
Well, the swim platform is off the shelf, nothing custom or fancy about it, except ordering the platform separate from the stairs so I could get the 3-step stairs that store nicely. Will be nice for getting in/out of the dinghy. But honestly I could have had one fabbed from aluminum that would have been really cool, but the cost and weight start to add up. With a little bit of work, I bet you could glass one up and make it functional and light and look super cool.

The trim tab manufacturers want you to get a much larger tab than you need. Our boats have less deadrise than many boats, and weight a LOT less, so we don't really need what they specify. Also, keep in mind that their sizing is based on being able to trim the nose of the boat down, which is not what the GA needs, at least in my case - I only need to trim to keep from listing. I think 9x18 is perfect. It sure works well at least. Plus, there is not enough room for a 24" tab and a transducer, so keep that in mind!

Brian.Dixon

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Re: GA 28 built by Kachemak Skiffs Wasilla, AK
« Reply #152 on: November 07, 2019, 06:46:07 AM »

I worked hard to make sure the Great Alaskan planed at exactly the right angle ... about 4.1 degrees bow up.  Commercial boats are rarely optimized to that degree (pardon the pun) unless it's a) an expensive boat, and b) it's been on the market for a long time and has been fine-tuned over the years.  I'm very pleased with the GA planing angle ... exactly as predicted with the marine modeling software (Orca3D).

Brian

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kennneee

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Re: GA 28 built by Kachemak Skiffs Wasilla, AK
« Reply #153 on: November 07, 2019, 08:02:00 AM »
Dan- Good input on the tabs. Unfortunately I ordered the 24x9 BOLTS last night.  I spoke to 3 different tab companies and they all advised me to go with that size. I can just squeeze them in between the chine and the transom. My boat doesn’t seem to be crying out for trim tabs so your logic is probably correct. If they prove to be to large cutting them down looks like a possibilty
Ken

Dan Boccia

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Re: GA 28 built by Kachemak Skiffs Wasilla, AK
« Reply #154 on: November 07, 2019, 09:17:59 AM »
I also ordered the 9x24 tabs, and just was not at all happy with them, so sent them back for the 18" version, no problems, no questions asked.

kennneee

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Re: GA 28 built by Kachemak Skiffs Wasilla, AK
« Reply #155 on: November 07, 2019, 09:40:51 AM »
Dan- Why were you unhappy with them?
Ken

Dan Boccia

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Re: GA 28 built by Kachemak Skiffs Wasilla, AK
« Reply #156 on: November 07, 2019, 03:42:20 PM »
They're just way too wide - they look weird, and most importantly did not leave enough room for my transom-mounted transducer. The transom looked very crowded when I mocked them up to take a look.

Brian.Dixon

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Re: GA 28 built by Kachemak Skiffs Wasilla, AK
« Reply #157 on: November 07, 2019, 04:02:28 PM »
They're just way too wide - they look weird, and most importantly did not leave enough room for my transom-mounted transducer. The transom looked very crowded when I mocked them up to take a look.

I think you are right about the manufacturer's guidelines .... OK for a big fat heavy glass boat, but you should downsize for lighter construction like the Great Alaskan.  Mostly, I suspect people use the tabs to correct port/starboard loading differences, not planing trim.  I have gotten zero feedback from people hinting about planing trim needing tuning .... even in choppy conditions where a bit of bow-down trim sometimes helps.  Anyone?
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Dan Boccia

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Re: GA 28 built by Kachemak Skiffs Wasilla, AK
« Reply #158 on: November 08, 2019, 01:38:30 PM »
Brian, we tried trimming the bow down with the tabs in a tight 4' chop and I feel like the handling got muddy - I was more comfortable without the tabs engaged.

Brian.Dixon

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Re: GA 28 built by Kachemak Skiffs Wasilla, AK
« Reply #159 on: November 08, 2019, 02:36:36 PM »
Brian, we tried trimming the bow down with the tabs in a tight 4' chop and I feel like the handling got muddy - I was more comfortable without the tabs engaged.

Thanks.  If I read that right, it's confirmation of not needing bow trim ... but there are always conditions out there that will bug one boat and not another.  I'm just glad that the modeling appears to be confirmed by reality (at $3k for the Orca s/w, I would hope so!)

bd
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Dan Boccia

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Re: GA 28 built by Kachemak Skiffs Wasilla, AK
« Reply #160 on: November 08, 2019, 06:34:11 PM »
That's correct Brian, I think your bow trim is pretty spot on, from what I've seen of other boats and my limited experience.

Brian.Dixon

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Re: GA 28 built by Kachemak Skiffs Wasilla, AK
« Reply #161 on: November 09, 2019, 07:59:50 AM »
That's correct Brian, I think your bow trim is pretty spot on, from what I've seen of other boats and my limited experience.

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