Re: [PSUBS-MAILIST] propulsion

Vance,

Look at this picture of Idabel...

http://stansub.fotki.com/the_submarine-1/above_water/submarine-1.html

Notice just under the yellow fairing between the lower pair, what looks to me like some type of linkage system, (suspicious for jettison able since these are in fact fixed thrusters). You can make out a pair of air compensating lines as well. Unless of course, all that does in fact have to do with the air compensation.....

Best to ask him directly but, I am far from there yet.

Joe

>From: vbra676539@aol.com
>Reply-To: personal_submersibles@psubs.org
>To: personal_submersibles@psubs.org
>Subject: Re: [PSUBS-MAILIST] propulsion
>Date: Sun, 03 Dec 2006 17:59:49 -0500
>
>Joe, Ref: Idabel--I wonder if those units are jettisonable? And how he did >it? Vance
>
>
>-----Original Message-----
>From: joeperkel@hotmail.com
>To: personal_submersibles@psubs.org
>Sent: Sun, 3 Dec 2006 5:04 PM
>Subject: RE: [PSUBS-MAILIST] propulsion
>
>
>"There was a good reason for that at the time, and I'm wondering if the >more powerful trolling motors available today will supercede the effort."
>
>Vance,
>
>As per your above quote, I am betting the farm on precisely this >assumption. However, just prior to commitment time, I will do some nosing >around with the Lake Okeechobee bass-boat crowd, and see what they have to >say about these things. How they perform on heavy boats in stiff >winds...etc.
>
>Notice that Idabel is in a fine position to easily swap out individual >units...I find that interesting, and something to emulate as closely as >practical.
>
>Joe
>
>
> >From: vbra676539@aol.com
> >Reply-To: personal_submersibles@psubs.org
> >To: personal_submersibles@psubs.org
> >Subject: [PSUBS-MAILIST] propulsion
> >Date: Sun, 03 Dec 2006 15:19:46 -0500
> >
> >
> >Frank,
> >
> >What are you using that makes 100# of thrust at speed? The Minn-Kota 101s > >make that on calculated static thrust or bollard pull tests, but will > >probably show something substantially less underway. I like them for the > >use, but am skeptical about the madison avenue claims until I can get one > >on the boat and see what's what.
> >
> >And just to fine tune your answer on big props, what they REALLY do best >is >provide good thrust at low speeds, which makes them more efficient in >close >maneuvering as well as transits, never mind applying some bias to >hold >things steady while fooling around in currents. Maneuvering thrusters > >compliment that power very substantially, making life easy for the pilot.
> >
> >I am watching with interest how things work out for those who are using > >those same maneuvering thrusters as main propulsion. Keep in mind here >that >George Kittredge started with trolling motors and gave up on them for >lack >of thrust--building his own at much greater expense. There was a good > >reason for that at the time, and I'm wondering if the more powerful > >trolling motors available today will supercede the effort.
> >
> >It would be interesting to spend some time with Karl Stanley and see what > >the limitations have turned out to be on Idabel. It sure is a lot simpler > >to do what he did than to build all this other stuff, especially if it's > >just for a few percent difference.
> >
> >Vance
> >
> >-----Original Message-----
> >From: ShellyDalg@aol.com
> >To: personal_submersibles@psubs.org
> >Sent: Sun, 3 Dec 2006 1:57 PM
> >Subject: Re: [PSUBS-MAILIST] payload
> >
> >
> >There was a thread on this a short time ago. A single, large propeller > >turning slowly gives more thrust (speed) while smaller, faster props give > >you more precise control in close maneuvers.
> >Multiple thrusters can act as a back-up system if one fails.
> >It would seem logical that a combination of the two would be best.
> >It depends on what purpose your sub is designed for.
> >If you want to motor over a long distance, moving quickly, a large > >propeller and a sleek torpedo shaped hull is best.
> >On the other hand, if you can tow, carry, or otherwise transport your sub > >to the dive site, and want to see something close-up, work, photograph, > >salvage, etc. then small multiple thrusters will be needed for the fine > >adjustments needed for that.
> >If, for instance, you want to attach a cable to a sunken boat, or move > >vertically along a wall to photograph the life, or anything that requires > >precise control, a single large prop wouldn't work at all.
> >I'm building my sub with two thrusters in the back with a rudder/dive >plane >mechanism for main forward/reverse propulsion.
> >Additionally, the two reversible side mounted thrusters can pivot 90 > >degrees from horizontal to vertical so up/down, forward/reverse, > >left/right, or spin without moving can be done.
> >With all four in the forward position, at full speed, the total thrust is > >400+ pounds.
> >A little extra thrust might come in handy when I need to push against a > >current or push the sub to the surface.
> >Some of the main things to consider would include: purpose, complexity, > >cost, reliability, replacement/maintenance, power consumption, and maybe > >entanglement.
> >I'll be watching for answers from the other guys on this to see what else > >is important.
> >Frank D.
> >________________________________________________________________________
> >Check out the new AOL. Most comprehensive set of free safety and security > >tools, free access to millions of high-quality videos from across the >web, >free AOL Mail and more.
>
>
>
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