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
************************************************************************ ************************************************************************ ************************************************************************ The personal submersibles mailing list complies with the US Federal CAN-SPAM Act of 2003. Your email address appears in our database because either you, or someone you know, requested you receive messages from our organization. If you want to be removed from this mailing list simply click on the link below or send a blank email message to: removeme-personal_submersibles@psubs.org Removal of your email address from this mailing list occurs by an automated process and should be complete within five minutes of our server receiving your request. PSUBS.ORG PO Box 311 Weare, NH 03281 603-529-1100 ************************************************************************ ************************************************************************ ************************************************************************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)Minn Kota specs the following for their saltwater outboard mounted motors...
Model Volts Thrust Shaft Lengths Engine Mount RT202/EM 36 202 — Engine Mount RT160/EM 24 160 — Engine Mount RT101/EM 36 101 — Engine Mount RT80/EM 24 80 — Engine Mount RT55/EM 12
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