T-Pain Is On A Boat: Re: [Electric Boats] Re: Emerging technology

Saturday, November 7, 2009

Re: [Electric Boats] Re: Emerging technology - hopefully lower cost

Will have to agree with all of it. However, I do enjoy sailing and find it quite relaxing, but racing improves the sport. New sails have been developed as well as new hardware, winches, etc, because of those that enjoy racing. Same is true in auto racing, etc. I try not to push my electric motor beyond 50 amps and believe that efficiency is the key to happy days, but I understand that those that push the limits will provide new ideas to the sport.

Don Swanson

On Sat, 7 Nov 2009 07:17:58 -0800 (PST) douglas caldwell <dognts2001@yahoo.com> writes:

Wow! It is about time that someone with a little common sense pointed that out to him. Way to go Kevin. I was going to chuck this group off as a lot of busy bodies with more money then brains and egoes to match, but now I will stay around because there just might be a chance I will learn something about the subject instead of who thinks they know something about it. Reading is pretty basic but understanding what is read well some people just never get that hang of it. Well with that said we will both probably get kicked off here. If so it has been fun sitting in the back ground watching.

--- On Sat, 11/7/09, Alycia & Kevin Miller-Lynch <ak@twcny.rr.com> wrote:

From: Alycia & Kevin Miller-Lynch <ak@twcny.rr.com>
Subject: RE: [Electric Boats] Re: Emerging technology - hopefully lower cost
To: electricboats@yahoogroups.com
Date: Saturday, November 7, 2009, 7:19 AM

If you read the website they clearly state that it is a jet, and their goal is higher speed, not efficiency… Seeing as these folks have been in business for quite a while and build a variety of jets (check out the rest of the site), I'll argue they know a little bit about what they are doing…. I'll keeping tuned to see what they come up with.

Kevin

From: electricboats@ yahoogroups. com [mailto:electricboa ts@yahoogroups. com] On Behalf Of danbollinger
Sent: Friday, November 06, 2009 8:19 AM
To: electricboats@ yahoogroups. com
Subject: [Electric Boats] Re: Emerging technology - hopefully lower cost

The website doesn't call it a Kort Nozzle, which is good, because it ain't! Kort nozzels have an airfoil-like cross section and the exhaust opens up in diameter, not restricts like this does.

What this unit is doing is creating a semi-jet system. It isn't a true jet because they are using a truncated propeller (which a Kort nozzle uses, too) and not an axial impeller that true jet systems use.

I would be surprised if this works. They are creating the jet exhause (high speed exhaust) under water. The friction between water to water is great and causes a lot of power-robbing turbulence. There is a reason jet systems exhaust above the water line. One under water jet system injects air all around the nozzle exit to help with this friction. And, it is going to be a fouling nightmare.

Torqeedo has the right idea. Spin a larger prop slower for more efficiency.

--- In electricboats@ yahoogroups. com, "Alycia & Kevin Miller-Lynch" <ak@...> wrote:
>
> I'm interested in small (12-18ft) electric boats for fishing, play etc, and
> like the cost of trolling motors. I saw this today which is an interesting
> improvement on the trolling motor concept.
>
> http://www.marineje t.com/view/ 67
>
>
>
> I'll be keeping my eye on it.
>
>
>
> Kevin
>