Re: [PSUBS-MAILIST] Minn Kota - Thrust

[Kenneth Schulze <aquamari@cruzers.com>]

Hi Pat & Ken,
I just wanted to add my two cents to this thread just to keep you on track
about thrust.
As you know;
Thrust = Force = mass * Acceleration
or
Thrust = W/g*(V0-V1)
also
Thrust= eff.*Shp/Vel
where  eff. is a function of velocity, Shp is the hp at the propellor, & Vel is
non zero

When thrust values are given for a products, many times it is for a static
condition (Vel=0).  The actual thrust will drop as velocity increases.

As someone stated earlier, theory is only theory.  Testing will provide how
much thrust you are producing from engine to the fluid.

Best Regards,
Ken Schulze

Captain Nemo wrote:

> ----- Original Message -----
> From: <Subscuba@aol.com>
> To: <personal_submersibles@psubs.org>
> Sent: Tuesday, March 07, 2000 12:53 AM
> Subject: Re: [PSUBS-MAILIST] Interesting item on eBay web
> siteitem#275822570: X-9 "Y...
>
> > My motor is rated at 1.2 horsepower with 70 pounds of thrust. 1.2
> horsepower
> > requires over 1KW from 24 volts. The motor is supposed to be about 92% or
> > more efficient.
> >
> > Ken Martindale
> >
>
> Interesting.  Then what is the thrust output of my Minn Kota 4HP?  (That's
> the model number; she's rated at 4 horsepower drawing 24 volts, but I don't
> recall what the brochure said about thrust.)
>
> Pat