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Flatback 22-2 Rebuilds / Re: 68 flatback 222 rebuild
« Last post by Ulysses485 on March 27, 2025, 02:07:36 PM »
I honestly cannot speak from first hand experience gutting stringers out and I am no pro....this will be my first 222 flatback build. With that said, these are just my thoughts. I think it really comes down to your stringer grid system. With enough bulkheads and spans over the larger span areas, I think you might be ok with one layer of 1708. I think the layer of 1.5oz wont really help as its not really a structural glass. It will just add weight and thickness. I would want the last layer to be of a structural glass. That's what you typically see in the bottom of hulls anyhow. One build comes to mind is from Dirtwheels (https://classicaquasport.com/smf/index.php?topic=4582.0). Check it out. He has a nice stringer grid system and it looks like he actually went with a layer of 1708 in the chines and then a layer of 1708 over the whole bottom and back to the chines again.
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Flatback 22-2 Rebuilds / Re: 68 flatback 222 rebuild
« Last post by IRBflatback68 on March 26, 2025, 08:57:49 PM »
That makes sense, I was planning on a layer of 1708 and a layer of 1.5 csm. I have a whole roll of each and plenty of epoxy. Not sure if I want to use all that 1708 on the bottom of the hull. Do you think a layer of each would be sufficient? Or should I just bite the bullet and double up the 1708 on the bottom?

Also going to fill the deep spot in the bow with a piece of kaycell and foam under it like many others. Should I cover the whole hull with glass first then add this? or will the 4 lb. Foam be good against the original hull then glass the whole hull over the filled in area after?

Thanks for the suggestions!
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Flatback 22-2 Rebuilds / Re: 68 flatback 222 rebuild
« Last post by Ulysses485 on March 26, 2025, 04:42:58 PM »
It's been a while but recently started working on the flatback again. The starboard stringer bow section was actually completely delaminated and I decided to cut out the old stringer system and go with Kaycell 25lb. density. I have an old note of measurements from my stringers that says the original was 11" from hull to top of stringer. Just wondering if anyone can confirm this because it's been a while and I forgot to check before cutting out. I plan to raise the sole 2.5" and want to make sure I cut the new stringers at the right height was thinking 13". That would leave me approx. 16" from top of sole to the top of gunnel. Does this sound about right? Thanks

Should be putting a layer of 1708 on the entire hull bottom and installing stringers in the next few weeks. Will post updated pictures when done.

It would be my suggestion that you put at least 2 layers of 1708 down on the entire hull if you are going with a more traditional stringer design. One thing I noticed is that these hulls are laid up really thin. The overall design of the hull includes a trapezoidal stringer. I think by eliminating this stringer type and going to a thin (3/4'' to 2'') straight up and down type stringer (if that makes sense) i think you don't have the load spread out like you do with a trapezoid therefore causing heavier and more concentrating loads and a fairly thin laminate. Additionally, I would assume your going with 4-stroke modern power on a bracket with a lot more weight than the hull was originally designed for. Again, just my opinion and some food for thought.
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Flatback 22-2 Rebuilds / Re: 1970 Flatback 222 - Barn find Revival
« Last post by IRBflatback68 on March 26, 2025, 01:46:35 PM »
That helps a lot! Thank you. Build looks good too. I like the idea of coring the hull sides!

I think I will shoot for 16.5-17" of cockpit @ the transom and level it from there after reading your suggestions. Seems like that should do the trick and raise the floor about 2.5 - 3 inches which is what I was originally planning for.

Thanks for the info and pictures again! Great reference points
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Flatback 22-2 Rebuilds / Re: 1970 Flatback 222 - Barn find Revival
« Last post by Ulysses485 on March 26, 2025, 01:10:51 PM »
Made some progress last night on measuring, cutting, and laying out the hull side coring. Id really like to get this glued in and capped with a layer of 1708 before the summer heat sets in. I'm planning on capping the outside stringers at the same time so it will be a BIG layup (one side per day though).



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Flatback 22-2 Rebuilds / Re: 1970 Flatback 222 - Barn find Revival
« Last post by Ulysses485 on March 26, 2025, 12:57:53 PM »
Do you know the measurement from the bottom of the hull to the top of the original stringer? I cut the old ones because a section became completely delaminated while doing some other work around it. I have a note that it was 11” just want to verify so I can cut new stringers out of composite and get rolling on mine again.

Thanks

In a nutshell, there is a factory stringer height (@ center of hull using a level across stringers) range from about 12.25'' to 9.5'' between the in deck live-well aft bulkhead to the transom. Probably a little lower towards the transom (because I measured to about the end of where an in deck fuel tank would be in these photos @ 70'' from livewell aft bulkhead). I think if you made the cockpit depth 16'' (at Stern) you would have more than enough deck height for self bailing with just about any bracket you choose and any number of live wells and locations you decide. I personally like having as much cockpit depth so I plan to raise deck about 2'' using 1'' honeycomb so I should have about 17.5'' to 18'' cockpit depth at the transom. I have to check but the factory height of the cockpit depth is somewhere around 19.25-19.75'' from what I remember. I did notice that there was a good bit of space between the bottom of the factory deck and the top of the the stringers. The outside stringers were not really bonded at all (see post #22) and the bonding material was 3/4' to 1'' in most places so a lot of wasted cockpit depth.

See photos for your use. Hope this helps. I can get better dimensions and clarify anything you need.


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Flatback 22-2 Rebuilds / Re: 68 flatback 222 rebuild
« Last post by Ulysses485 on March 26, 2025, 12:02:20 PM »
Hey bro, good to see you getting back after it! I did see your message on my post about the stringer heights. I will need to grab reference dimensions from the transom to give you an accurate reference but I upload some dimension pictures that I took of a few weeks ago when I was looking into how much room I currently have for a fuel tank below deck. I will post the pictures to my build thread and a little explanation.
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Flatback 22-2 Rebuilds / Re: 68 flatback 222 rebuild
« Last post by IRBflatback68 on March 26, 2025, 11:03:10 AM »
It's been a while but recently started working on the flatback again. The starboard stringer bow section was actually completely delaminated and I decided to cut out the old stringer system and go with Kaycell 25lb. density. I have an old note of measurements from my stringers that says the original was 11" from hull to top of stringer. Just wondering if anyone can confirm this because it's been a while and I forgot to check before cutting out. I plan to raise the sole 2.5" and want to make sure I cut the new stringers at the right height was thinking 13". That would leave me approx. 16" from top of sole to the top of gunnel. Does this sound about right? Thanks

Should be putting a layer of 1708 on the entire hull bottom and installing stringers in the next few weeks. Will post updated pictures when done.
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246/250 CCP Rebuilds / Re: Project - Aquasport 246CCP, 1979, Captain Koz II
« Last post by kaptainkoz on March 25, 2025, 10:54:35 PM »
Thank you Duffy I appreciate it!

Powerhead is ready
Powerhead is complete and ready to mount. Good riddance. I’ve done a few of these in my day but I forgot how tedious a ring job with a proper cleaning, inspection and reassembly is. Should be a really solid motor. I’m pleased with what I had to work with and the outcome. Time to drop this one on a dolly, clean up the tools and tables and shift gears to fiberglass and gelcoat.
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Flatback 22-2 Rebuilds / Re: 1970 Flatback 222 - Barn find Revival
« Last post by IRBflatback68 on March 25, 2025, 05:32:56 PM »
Do you know the measurement from the bottom of the hull to the top of the original stringer? I cut the old ones because a section became completely delaminated while doing some other work around it. I have a note that it was 11” just want to verify so I can cut new stringers out of composite and get rolling on mine again.

Thanks
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