Re: [DSII] Sinking hover tanks
From: Oerjan Ariander <oerjan.ariander@t...>
Date: Wed, 25 May 2005 18:24:45 +0200
Subject: Re: [DSII] Sinking hover tanks
Roger Books wrote:
> >Some time ago we had a discussion about heavy hover tanks over water.
> >conclusion was that if the tank massed enough that the pressure/area
> (PSI in US terms) >was too great the tank would sink while furiously
> blowing bubbles from under its' skirt. >Basicly a Hammer's Slammer
> hover-tank would probably sink.
Not just "probably"...
> >The thing we didn't discuss was how movement would affect this. If
> >were moving at 100KPH would this affectively give it a greater area
> under the skirts?
Don't think so, no. If it is really lucky it might plane on the water
surface much like a fast-moving snow-mobile can do - but that requires
it comes into actual physical contact with the water (as opposed to
separated from the water by its air cushion), so it'd run a major risk
damaging at least the rear wall of its plenum chamber.
Roger B-W wrote:
>Depends on the design, but generally the skirts are designed to keep
>outside air away from the cushion as much as possible. I very much
>that compression under the leading edge will be significant compared
>with compression from the main lift fan.
>On the other hand, a vehicle could be _designed_ for this mode of
>motion; googling for "ekranoplan" will show a lot of vehicles that were
>quite specifically intended to operate over water.
But such a vehicle would not be a hovercraft. Ekranoplans - aka WIGEs or
GEVs (the proper use of the term "GEV", as opposed to the incorrect SF
of the term to mean "hovercraft") - have no plenum chamber; they are
essentially aircraft with wings too stubby to allow them to fly very
instead relying on the lift-increasing Wing-In-Ground-Effect (or just
"Ground Effect" for short) to keep them flying.
"Life is like a sewer.
What you get out of it, depends on what you put into it."