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Roger Rabbit. Built by an unknown builder. |
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There isn't really much info on this K-350 at the psubs site. But you can see the difference in the shape of the soft tanks in comparison to Dan’s above. |
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John Farrington. Unfinished build.
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Johns website is very detailed of his K-350 build. However, it hasn’t been updated for a while and he seems to have disappeared, so i'm not sure of the current status. |
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Construction photo journal of Persistence And another good page here |
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Construction photo journal. Here |
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Dean Ackman. Under Construction. |
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Dean is progressing with his K-350. Again, he's making some changes to the original design. Note the 3 front viewports. He tells me he's adding many other features including Fly by Wire, Outside Shell, Hydraulic Controls, 12HP motor amongst others. |
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Pictures on FRAPPER Here |

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Here you can see details of people who are building/operating the same K-350 model. I am trying to gather details of as many boats and owners as I can together on this page. So if you are K350 building, or have any information to add, I would appreciate an email! There are other models of submersible that George designed, but I am trying to keep this page just to the 350. |
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Lake Diver. |
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This K350 was built by John Maynard. Here it’s being launched from its own specially built boat tender. I bought my plans from John and he has updated some of the drawings to CAD. I believe John is currently working on a second boat to be called “Lake Diver 2”. |
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John’s Homepage Here |

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Captain George Kittredge. |
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George Kittredge is a retired US Navy submarine Captain and the designer of the K350 submersible. Working under the name of “Kittredge Industries”, he built 46 of these subs in various different models. I can’t actually find much information of where these subs are nowadays, but George’s biography “I Found Israel’s Atom Bomb Factory” details the building and operating of the subs, plus is a fascinating account of his times during the war. Very interesting book. |
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NEWMAS. |
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This K350 was built by Kenny Sanford and partner. They started work in 1982 and finished just two years later in 1984! Used originally to investigate a wreck, the sub is now on display at the “Hatfield Marine Science Centre” in Newport, Oregon. |



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Submersible Build Log |
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Guernsey SubmarIne |
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Other K-350 Subs. |
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Persistence. Built by Dan Hryhorcoff. |
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“Persistence” built by Dan Hryhorcoff. He has made several modifications to the standard design shown on the plans, the most noticeable being the shape of the soft ballast tanks. |