Re: [PSUBS-MAILIST] Minn Kotas

Ok then ......I am going to redraw the thing with a large steer able stern wheel, fixed fractional thrusters (Minn Kotas in tubes), large saddles, four 120's, and a snub nose.

This is going to look more like the original Alvin then, short and squatty, I may even hide the pods this time...I'll work the brow to make it less draggy, a bit more Pisces like.

I smell "sea boat"!

Joe

>From: vbra676539@aol.com
>Reply-To: personal_submersibles@psubs.org
>To: personal_submersibles@psubs.org
>Subject: Re: [PSUBS-MAILIST] Minn Kotas
>Date: Sun, 19 Nov 2006 19:33:06 -0500
>
>
> Perry built subs a quarter mile north of the Palm Beach Inlet. What do >you think? Vance
>
>-----Original Message-----
>From: joeperkel@hotmail.com
>To: personal_submersibles@psubs.org
>Sent: Sun, 19 Nov 2006 6:45 PM
>Subject: Re: [PSUBS-MAILIST] Minn Kotas
>
>
>Vance,
>
>"maybe we ought to be thinking PC-14. Use a 3 hp golf cart motor through >the right reduction gear and turn a big wheel".
>
>......I took a quick look at PC-14, was this designed to transit long >distances along the bottom?
>
>A large slow turning prop is more efficient than a small fast one, I know >this from aviation. Something like this would certainly fair better in a >current than thrusters, make transits much easier and, this whole rig could >pivot on the existing rudder bar system.
>
>Alvin initially had this big wheel rig. But Alvin is more suited to >hovering with fine buoyancy control and bursts from her thrusters which is >what I have in mind also.
>
>But, let me ask you this, for our coastal environment, with that prevailing >northward current that can get quite troublesome, would some combination of >a large efficient stern wheel and some fixed fractional hp thrusters be >ideal?
>
>Joe
>
>
>
>
>
>
>From: vbra676539@aol.com
>Reply-To: personal_submersibles@psubs.org
>To: personal_submersibles@psubs.org
>Subject: Re: [PSUBS-MAILIST] Minn Kotas
>Date: Sun, 19 Nov 2006 14:25:04 -0500
>
>
>Joe,
>
>George settled on 3 horsepower after experimenting with several other >combinations, including smaller trolling motors. I don't know if the thrust >calcs from Johnson Outdoors is static or dynamic, and those results would >make a substantial difference. However, I'm thinking that if you used three >of the 101s from Minn Kota, two reversible units forward on a common shaft, >one on the stern, and one fixed lateral on the bow, then the boat ought to >do pretty well.
>
>However, I'd miss that big old slow turning wheel from Perry, and I have to >tell you, I have never found anything quite as good in all the other >configurations I tried, horsepower be damned. I can remember having the >1201 trimmed dead neutral on the bottom skirt of the CDP-1 platform in the >North Sea oil patch, and moving the boat slowly along while we filmed with >the main motor on its minimum setting. The prop was going so slow that I >could actually see little jerky movements as the SCR fired!!!
>
>The 12-boats weighed 8-tons, mind you. At dead slow RPM we weren't using >much horsepower, but that big 3-bladed fan in back was doing all I wanted >it to do, thank you, and it was a beautiful thing to see. Looking at it >that way, maybe we ought to be thinking PC-14. Use a 3 hp golf cart motor >through the right reduction gear and turn a big wheel. It's heavy and >cumbersome and takes a lot of room and puts out a lot of heat and blah, >blah, blah. But man, you will love it. Guaranteed.
>
>Vance
>
>
>-----Original Message-----
>From: joeperkel@hotmail.com
>To: personal_submersibles@psubs.org
>Sent: Sun, 19 Nov 2006 2:03 PM
>Subject: RE: [PSUBS-MAILIST] Minn Kotas
>
>
>Vance,
>Interesting comparison here, perhaps you can comment. The WHOI user manual >for Alvin specs 150 lb thrust for ea of the 6 thrusters....(Alvin weighs >35k)
>http://www.whoi.edu/marops/vehicles/alvin/userman_subsystems.html#propulsion
>Minn Kota specs the following for their saltwater outboard mounted >motors...
>ModelVoltsThrustShaft Lengths
>Engine Mount RT202/EM36202—
>Engine Mount RT160/EM24160—
>Engine Mount RT101/EM36101—
>Engine Mount RT80/EM2480—
>Engine Mount RT55/EM1255
>
>
>The Busby manual says power requirement selection is based on a velocity >-vs- resistance formula. What's your best intuitive guess for a K-sub to >hold it's own against a prevailing 2-3 kt current?
>Joe
>
>
>
>
>
>From: vbra676539@aol.com
>Reply-To: personal_submersibles@psubs.org
>To: personal_submersibles@psubs.org
>Subject: [PSUBS-MAILIST] Minn Kotas
>Date: Sun, 19 Nov 2006 12:41:11 -0500
>
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