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Re: [PSUBS-MAILIST] K-600 Reconditioning
Hi Alec,
For the small ambient I'm building, I've bought a number of solenoid valves
as a supplement for my ballast tank valves. They will be plumed around the
ballast valves. They are operated wirelessly from a playstation 2 controller,
as is everything else. PS2 controller & input output converter $100-
plus relays plus valves. With this system you could replace burped air remotely from
the tow boat & fine tune the ballast easily if you are compensating for your extra
passenger with a large bubble.
Regards Alan
----- Original Message -----
From: "Smyth, Alec" <Alec.Smyth@compuware.com>
To: <personal_submersibles@psubs.org>
Sent: Saturday, November 12, 2011 12:50 PM
Subject: RE: [PSUBS-MAILIST] K-600 Reconditioning
Still working on them! At this point the tanks themselves are done, and
I am painting them, but I have to do the mounting and plumbing bits, and
I haven't yet sourced the parts for that. These tanks are in addition to
the fore and aft tanks, not a replacement. The rationale is...
- I am very low on freeboard in open water, if any burping takes place.
You don't want to sit inside the boat during an hours-long tow, and by
the end of a tow the sub has normally burped quite a bit, so it can be
hairy boarding. Additional tanks will not add a lot more freeboard,
because once the apex of the main cylinder is above the surface, the
marginal lift required for any additional freeboard increases
tremendously. However, as the saddle tanks won't burp, at least the boat
should stay up instead of settling down.
- I don't have a VBT anymore, I've gone to fixed lead ballast. It's not
fun shipping and unshipping the weight of a person in weights each time
you go between diving alone or with a passenger. I am hoping to
permanently ballast for one person, and if I have a passenger on board
simply use a much larger "bubble" to compensate.
- Fore and aft tanks are great for adjusting longitudinal trim, but for
buoyancy trimming it should be easier with saddle tanks.
- I'm hoping to plumb the saddle tanks with much larger tubing than the
standard MBTs, so I can vent my bubble very quickly as it expands on an
ascent. On the Kittredge tanks I now have half inch valves. It's
certainly faster than the smaller original ones I had before, but for a
tank that will have a large bubble, I'd prefer the dump to be super
fast.
The tanks are 3/8" fiberglass, molded on male foam molds that I then
dissolved. Note also Greg came up with a very nice solution that used
off-the-shelf tanks for saddle MBTs when he reconditioned Scott
Cassell's K-250 "Great White".
I'll upload photos when done, probably in 2-3 weeks.
Thanks,
Alec
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From: owner-personal_submersibles@psubs.org
[mailto:owner-personal_submersibles@psubs.org] On Behalf Of Jon Wallace
Sent: Friday, November 11, 2011 3:02 PM
To: personal_submersibles@psubs.org
Subject: Re: [PSUBS-MAILIST] K-600 Reconditioning
Alec,
Any photos of your saddle tanks yet? I've begun to consider the same
thing for the 600, possibly removing the bow and stern tanks completely.
Now that I have the existing tanks off in preparation for refinishing, I
like the look. It's more compact and clean looking. I can easily match
the flotation of the bow/stern tanks with appropriately sized saddle
tanks, or add them to the existing configuration to provide more lift
and stability on the surface.
So I'm curious, did you remove the bow/stern tanks or just add the
saddle tanks to the stock K-250 configuration?
Jon
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603-529-1100
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