Homemade Submarine Plans

Homemade submarine plans, or homebuilt submarines plans, for actual functioning submarines that carry people are a little hard to come by.  Here's what I've found: 

George Kittrege K-250 and K-350 are one-atmosphere dry submarines and are the only such homebuilt submarine plans that I've found.  This design seems pretty popular with homebuilders.

  johnmaynard.tripod.com  Lake Diver, Inc. a sub builder for hire and source for the full K-250 plans at 250.00 USD and K-350 plans at 350.00 USD.

  www.psubs.org/store  PSUBS has a single sheet of the K-250 plans for sale for 30.00 USD. (It's a Conceptual Hull Drawing which apparently can get you started at least evaluating the design).

The SportSub from International VentureCraft is offered in kit and fully-built form.  This company has a series of ambient pressure, semi-dry subs.  AutoHover, sonar and other features are available and these craft seem to be used in the resort trade.

  www.ivccorp.com  Their SportSub II kit is $29,995.00 and a SportSub III kit is $34,995.00 but you'll have to go to their site to get all the details as to what's included. 

Delta Wing Submarine is a semi-dry single person craft that is designed for divers.  First seen in 1968 in Popular Mechanics, the sub is slightly buoyant and uses the two propulsion motors to descend and ascend.  Not much information here on performance but you're supposed to be able to exit the boat in less than 5 seconds!

  www.psubs.org/store  PSUBS has plans for 28.50 USD

Silent Runner II is a semi-dry sub and a diver transport vehicle that is not bad looking.  Built around an aircraft drop tank, this model features two trolling motors, ballast adjustment and I'd say, some retro cachet.

  www.psubs.org/store  PSUBS has plans for 28.50 USD

AquaSub from Robert Riley Enterprises has plans for what could be described as a dry pontoon boat/sub that allows the pilot compartment to descend to a depth of...  three feet.  This one's been around since the mid-1970s and maybe you've seen it in Popular Mechanix or Popular Science.
  www.rqriley.com/aquasub.html   AquaSub plans available for 45 USD and the estimated cost to build is 1500 USD.

And finally, just for good web browsing, here's a page listing images of 45 historic submarine plans: Submarine plans