Re: [PSUBS-MAILIST] Re: high speed subs

["Marsee Skidmore" <heyred@email.msn.com>]

Yeah, what he said. Resistance doesn't happen without velocity, and the
settle-butt that Vance describes is at dead stop. The force acting over a
lever arm is resisted only by the inertia of the boat, swinging it like a
pendulum. This would happen in a totally frictionless fluid (WD-40?), or in
a vacuum. - Joe

----- Original Message -----
From: Captain Nemo <vulcania@interpac.net>
To: <personal_submersibles@psubs.org>
Sent: Sunday, February 27, 2000 1:47 AM
Subject: Re: [PSUBS-MAILIST] Re: high speed subs


> Yo, Vance!
>
> ...> Maybe this is also a consequence of FORCE versus INERTIA.  (How to
make this
> simple?)  The prop starts spinning, but it takes a moment to overcome
> inertia.  The weight of the boat resists the thrust of the prop.  If it
> can't move forward,  maybe the prop is sort of "chewing it's way down"
into
> the water like a buzzsaw blade into wood, pulling the stern down with it.
>
> I know that description is laughably untechnical, but pick up a model sub;
> put your palm in front of the bow to simulate inertia; and visualize the
> result of a thrust vector  situated THAT LOW BENEATH THE LONGITUDINAL
> CENTERLINE AND C/B.  I think I can see it how it might pull the stern of
the
> boat down.
>
...
> Pat
>
>