Path: utzoo!attcan!utgpu!watmath!att!cbnews!military
From: raymond@io.ame.arizona.edu (Raymond Man)
Newsgroups: sci.military
Subject: Hydrofoil Carrier
Message-ID: <11638@cbnews.ATT.COM>
Date: 22 Nov 89 04:13:47 GMT
Sender: military@cbnews.ATT.COM
Organization: AME Dept., Univ. of Arizona at Tucson
Lines: 30
Approved: military@att.att.com



From: raymond@io.ame.arizona.edu (Raymond Man)

	In <11596@cbnews.ATT.COM>Rex A. Buddenberg asked
> CVs can
>crank out 30+ knots when working aircraft.  Hydrofoils advertise
>55+ knots.  What good is a 25 knot increase when dealing with
>aircraft that operate at 300+ knots?

	It is as good as having a catapult, since approximately

	(V - U)^2 = 2 a s	V = Launch Speed
				U = Wind over deck
				a = acceleration
				s = take off run

and if the take off speed is 90 knots, then

	(90 - 30)^2 =:= 3 * (90 - 55)^2

So for the same take off run the effect is like having a 3g catapult. It
is actually better because the relative landing speed will also be
lower and hence the sink rate, the deck structure, risks etc.

	The crust of all this is both take off run and dynamic pressure
on the wings are proportional to the square of relative velocity.

Just call me `Man'. Uh-oh. I don't know.
raymond@jupiter.ame.arizona.edu