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Hey Vance, What, you don't like historical fiction? ;)' With a miner twist it could be hysterical fiction. I went and read that part again in his book from page 277-279. Your story was better then mine, but the K-600 did float (according to the book), but not by much. He had done his calculations for weight and strength with the sub having 1/2" thick heads, and the people he was building if for had a tech guy that wanted the heads to be 9/16" thick, and so he built them that way without redoing his weight calculations. So that was part of the weight issue. The heads might of started as 5/8" plate so that the minimum thickness after forming would be no less then 9/16". I'll have to make an adjustment to the variable thickness heads I worked up off of the specs I got from James Frankland's K-350 heads and see what the difference of weight would likely be between a 1/2" head and a 9/16" head. Any of you guys that have not read George's book, should grab one from Jon. It's a great read, even if your not really into submarines. I hope Jon still has a few copies. "I'm betting that I'm just abnormal enough to survive." ~ The Tick Cheers, Szybowski To: personal_submersibles@psubs.org Subject: Re: [PSUBS-MAILIST] new flicks Date: Sun, 8 Feb 2009 07:04:24 -0500 From: vbra676539@aol.com You're mixing sub stories. The first sub was exactly as calculated. It was George's nerve that was too light. He took the lead off before diving, and then had to add weight back. The aft 2 foot section was added for a passenger, which always seemed kind of weird to me. The one that didn't float was the K-600. They added two feet to its stern as a last minute emergency measure (for Lloyd's). It is the same size now as a 2-man K-350 but is only for one pilot and zip passengers due to the heavier material (3/8" wall and 9/16" heads, as I recall). I wonder what happened to that deal about somebody transferring blueprints to disc and selling same for the K-600. Maybe Jon knows, or maybe someone just conned the old man. At any rate, the subs aren't nose heavy. They are tail light!!! By design, of course. Except for that pesky K-600. Vance -----Original Message----- From: Brent Hartwig <brenthartwig@hotmail.com> To: PSUBSorg <personal_submersibles@psubs.org> Sent: Sat, 7 Feb 2009 9:12 pm Subject: RE: [PSUBS-MAILIST] new flicks Hi Dean, Looks like a lot of good progress. I like the longer battery pods. The basic K-350 design, I've heard is a bit nose heavy, so they have to add lead to the stern area. Having the pods and conning tower more forward must be the reason for this extra nose weight. That design configuration I would guess is because George designed and built the first K-350 with out the extra two feet of tube section that is now in the back. Then when he put it in the water for the first time he realized he had messed up on his calculations and needed more buoyancy. So he added the length of tube in the back. At least that is the story I read in his book. Keep grinding and shaping, you'll getter dun. ;}' If you make the sub to heavy, you can always add a couple of feet to the tube section of the pressure hull. You can't ever have enough space. " Space isn't remote at all. It's only an hour's drive away if your car could go straight upwards. " ~ Fred Hoyle Regards, Szybowski |