David replied to me:

> > Archvillain's Yacht (1920s Version) v1.0 (TL6)
> >  Copyright 2006 by Onno Meyer
> >
> >  An Evil Overlord with style will not be confined to a clammy mountain
> > fastness. With a yacht like this, he - or she - can travel with all the
> > comforts of home.
> >  The yacht is powered by twin steam turbines for a top speed just over
> > 30 knots.
> 
> Not with a length of 120 feet, it's not.  Speed of a displacement boat
> is limited to about 1.35 * sqrt (LWL).  (LWL is length on water line,
> typically less than overall length).   To go faster, you need to
> plane.  To plane 700 tonnes, you'd need quite a bit more power.
> Here's a modern boat (it ain't a yacht if it doesn't have sails,
> dammit) of about the same size, and claimed speed.  Note it only
> displaces ~150 tonnes, and has about the same amount of power.  It
> also needs life rafts, and a tender.  (I assume the escape boat is
> super secret).
> 
> cool idea, though.

There are two external cradles (davits) in addition to the secret
dock. Regarding the speed, it follows the rules - 90,000 lbs. of 
thrust for 500 stons (rather less than 700 metric tons). But a 
LWL over 400' is out of the question, I fear. Would a cat hull
help?

Onno
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