[PSUBS-MAILIST] Trustworthy launch

[swaters]

My end caps are 3/8 thick. My sub design follows the K-350 almost exactly with the acception of alot of small changes that don't affect the main structure or boancy. The only thing that affects it is the tanks on the outside.
Thanks,
Scott Waters




Sent from my U.S. Cellular© SmartphoneJames Frankland <jamesf at guernseysubmarine.com> wrote:Hi Scott,
Congratulations on your launch!  Sounds like it went well, even if the boat was a bit light.  Gives me an idea of how much weight i need for mine now. 
 
Can you tell me how thick your endcaps are?  Mine are spun and so are 13mm thick at the flange.  This makes them pretty heavy.
 
I lifted the sub onto the trailer yesterday but the driver couldnt tell me the weight as his gauge only kicked in at 5 tonns.  He described lifting the boat as "like lifting a matchbox".  Not sure if thats good or not..!
 
Anyway, great to hear your in the water.
Kind Regards
James
 


 
On 16 September 2013 01:04, Joe Perkel <josephperkel at yahoo.com> wrote:
Scott,

Congratulations, Trustworthy is beautifully built, very well done, very professionally executed!

Largest seagull audience I have seen since Jonathan Livingtons aerobatics show! :) 

I think Dan H said his K boat per plans required an extra 400 lbs of internal weights to submerge.
There's a bit of room there then on a standard k boat for high density exostructure, external fairings and systems, ie manipulator.

Congrats again, well done!

Joe


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From: swaters <swaters at waters-ks.com>; 
To: <personal_submersibles at psubs.org>; 
Subject: [PSUBS-MAILIST] Trustworthy launch 
Sent: Sun, Sep 15, 2013 3:19:46 PM 

Hey guys. I did the first dive in trustworthy. The boat is bone dry with no leaks or even weeping after being in the water for three hours. I did have a few electrical problems due to not getting the grounding bolt area clean enough of epoxy paint, but that is a easy fix. A problem I had was not weighing enough. It was me and a buddy we both weigh 175 pounds or so. The two drop weights are 250 pounds total (same as kitteredge). I ended up putting 100 pounds of lifting weights, about 200 pounds of old jacks and it still wouldn't go down. I had the safty dives stand on it and it went down. After scrathing my head for a while I decided the scuba tanks on the outside which had 100 pounds negative boancy now is close to 0 boyancy so that makes due for a little, of the extra floatation. But what about the extra weight of the jacks and the divers? The only thing I can think of is the tanks were not venting well. I notice they got hydro locked way to easy. It seems like the 1/2 " line is way to small. So the only thing I can figure out is maybe the ballest tanks were not venting all the way. Everything about my sub is built just like the blue prints so that is the only thing I can think of about it being to bouant. Any thoughts?
Thanks,
Scott Waters




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