Re: [PSUBS-MAILIST] Drop Weights

You could try

Trawlworks...

RI ftw!

http://www.trawlworks.com/

Desert star has used there smaller floats instead of syntactic for several shallow apps. They also used hollow steel spheres that I think we got at mcmaster. I have no idea what sizes they come in.

-a

vbra676539@aol.com wrote:
> Well, there IS the Gulf Stream to carry that stuff, and you live on the > East side of it, the last time I checked. Maybe they're coming from > Havana? However, somebody somewhere gets them. If we don't find them on > the web, we'll ping on Phil the end of the month. Maybe he'll know. > Meanwhile, I'll call Pete Hoffman and maybe HBOI (if there is anyone > left up there who will talk to me). Otherwise, maybe I can set up a > cheap-o distributorship. Carsten might help. Those things are way too > handy not to have.
> Vance
> > > -----Original Message-----
> From: Jay K. Jeffries <bottomgun@mindspring.com>
> To: personal_submersibles@psubs.org
> Sent: Tue, Sep 15, 2009 6:57 pm
> Subject: RE: [PSUBS-MAILIST] Drop Weights
> > There has to be a source in the US for that product or a similar one as > we find the floats washed up here on the beach all of the time.
> R/Jay
> > / /
> *From:* owner-personal_submersibles@psubs.org > <mailto:owner-personal_submersibles@psubs.org> > [mailto:owner-personal_submersibles@psubs.org > <mailto:owner-personal_submersibles@psubs.org?>] *On Behalf Of > *vbra676539@aol.com <mailto:vbra676539@aol.com>
> *Sent:* Tuesday, September 15, 2009 7:00 PM
> *To:* personal_submersibles@psubs.org > <mailto:personal_submersibles@psubs.org>
> *Subject:* Re: [PSUBS-MAILIST] Drop Weights
> > That's all I see for the moment. Let me make a call.
> Vance
> > > -----Original Message-----
> From: Jay K. Jeffries <bottomgun@mindspring.com > <mailto:bottomgun@mindspring.com>>
> To: personal_submersibles@psubs.org <mailto:personal_submersibles@psubs.org>
> Sent: Tue, Sep 15, 2009 6:47 pm
> Subject: RE: [PSUBS-MAILIST] Drop Weights
> Vance,
> Can you suggest a source in the US? I am only finding mostly European > sources.
> R/Jay
> > / /
> *From:* _owner-personal_submersibles@psubs.org_ > <mailto:owner-personal_submersibles@psubs.org> > [_mailto:owner-personal_submersibles@psubs.org_ > <mailto:owner-personal_submersibles@psubs.org?>] *On Behalf Of > *_vbra676539@aol.com_ <mailto:vbra676539@aol.com>
> *Sent:* Tuesday, September 15, 2009 6:48 PM
> *To:* _personal_submersibles@psubs.org_ > <mailto:personal_submersibles@psubs.org>
> *Subject:* Re: [PSUBS-MAILIST] Drop Weights
> > You're welcome. And besides, those Nokalons look really offshore hanging > in the garage. No one else has them except the net fishermen.
> Vance
> > > -----Original Message-----
> From: _Recon1st@aol.com_ <mailto:Recon1st@aol.com>
> To: _personal_submersibles@psubs.org_ > <mailto:personal_submersibles@psubs.org>
> Sent: Tue, Sep 15, 2009 2:26 pm
> Subject: Re: [PSUBS-MAILIST] Drop Weights
> *Vance I think we should keep you around. That is a good plan. Just > about every time I do*
> *something permanent like, I seem to regret it a little later or at > least a better solution.*
> > *Dean*
> > In a message dated 9/15/2009 12:50:52 P.M. Central Daylight Time, > _vbra676539@aol.com_ <mailto:vbra676539@aol.com> writes:
> > Syntactic--is that a trick question? Before getting into all that
> mess, I'd recommend taking your best SWAG and order some Nokalon
> buoys. Get the kind with the hole through the middle and you can
> string them on a pipe like beads on a necklace. They come in all
> sizes and depth capabilities. Get the ones that are 9 or 10 inches
> across. They won't be pretty, but you can add plenty of buoyancy
> mighty quick with them, and figure out in the process if the
> solution you need should be more permanent.
> Vance
> > > -----Original Message-----
> From: _Recon1st@aol.com_ <mailto:Recon1st@aol.com>
> To: _personal_submersibles@psubs.org_
> <mailto:personal_submersibles@psubs.org>
> Sent: Tue, Sep 15, 2009 1:26 pm
> Subject: Re: [PSUBS-MAILIST] Drop Weights
> *Vance yup she be fun. Lets see how you spell syntac foam*
> > *Dean*
> > In a message dated 9/15/2009 12:23:41 P.M. Central Daylight Time,
> _vbra676539@aol.com_ <mailto:vbra676539@aol.com> writes:
> > Will 200# compensate for your VBT. If that's your only external
> void, then it should be enough. If you are already running
> short, however, then you're going to be thinking about auxiliary
> flotation pretty soon, too. Hmm. Lots of problems. Fun, ain't it?
> Vance
> > > -----Original Message-----
> From: _Recon1st@aol.com_ <mailto:Recon1st@aol.com>
> To: _personal_submersibles@psubs.org_
> <mailto:personal_submersibles@psubs.org>
> Sent: Tue, Sep 15, 2009 12:30 pm
> Subject: Re: [PSUBS-MAILIST] Drop Weights
> *I am not real sure on this. I wanted to have a 200 lb drop
> weight. Just seems like a good*
> *number to me. My sub is very stable and I am quite sure would
> not be a problem. I do however*
> *want it located close to my CG so I come up level. This problem
> I must solve this winter as*
> *now I only have about 110lbs to play with and it is not at my
> CG. Not to mention I do not*
> *have my arm on and several other little goodies.*
> > *Must be real nice having that much to play with. Ah to have it
> to do over hehheh*
> > *Dean*
> > In a message dated 9/15/2009 10:54:48 A.M. Central Daylight
> Time, _ShellyDalg@aol.com_ <mailto:ShellyDalg@aol.com> writes:
> > Dean, you mentioned that your drop weight was not very big
> and the front was a little light.
> It started me thinking about the size of my planned drop
> weight. I've read about a lot of subs and there doesn't seem
> to be a lot of commonality in percentage of drop weight used
> for the various sizes of psubs.
> I remember the little video about towing the Delta sub and
> during the submerged part of the video they said it had a 40
> pound weight that could be dropped.
> Other subs had drop weights that ranged up to 400 pounds.
> I wonder if there's a danger in having too big a drop
> weight. Can it cause problems when it's released?
> An advantage to a large drop weight would be that when
> dropped the sub would have more buoyancy and be able to
> "tear free" from a minor entanglement like the kelp we have
> around here.
> The disadvantage could be a too rapid ascent and maybe some
> instability once you reached the surface.
> Both of these could be quite dangerous.
> The surface instability may not be that critical because at
> least you're back up where you can be reached by the surface
> crew and a line can be attached to the sub.
> The uncontrolled ascent rate is the thing that I was
> worrying about.
> I had planned on a pretty large drop weight. More like 750
> pounds. The drop weight mechanism is designed in a keel
> shape, and has a bunch of wheel rollers so I can roll the
> sub around when it's on the floor in the shop, and when
> launching the sub it can roll on and off the trailer.
> The actual lead weights will be shaped to fit inside the
> steel keel form and bolted in. The total weight can then be
> adjusted by adding/removing weights but the steel keel
> mechanism itself weighs about 250 pounds.
> The total lead ballast needed to sink the sub is going to be
> close to 1800 pounds. Most of this is bolted to the floor
> inside with some of it on a sliding mechanism to adjust trim
> angle.
> These are rough numbers at this point of the build and my
> float test will determine exactly how much is actually
> needed depending on what all I put into the interior of the sub.
> Adding a passenger, equipment, and later improvements like a
> manipulator arm or whatever can be compensated with the
> underfloor weights.
> In the model testing I did the sub wobbled during ascent
> when it was simulated dropping the weight but it stayed
> level and fairly stable on the surface. It's the wobbling
> when coming up that concerns me.
> Anybody got any thoughts on this?
> Frank D.
> > > ------------------------------------------------------------------------
>
-- Andy Goldstein
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