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From: ahiggins@pequod.cso.uiuc.edu (Andrew Higgins)
Newsgroups: sci.space
Subject: Re: Solar Impact Mission.
Keywords: keyhole, keychain
Message-ID: <1991Feb10.012749.12822@ux1.cso.uiuc.edu>
Date: 10 Feb 91 01:27:49 GMT
References: <1991Feb4.111437.9283@helios.physics.utoronto.ca> <1991Feb4.172846.3706@zoo.toronto.edu> <1991Feb5.154205.29266@engin.umich.edu>
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In article <1991Feb5.154205.29266@engin.umich.edu> theslim@caen.engin.umich.edu writes:
>> For really tight turns, what you want is a waverider design that can fly
>> at high hypersonic speeds in an atmosphere.  Then you can do a right-angle
>> turn or even a 180 around any planet with a substantial atmosphere, e.g.
>> Venus.  Aerodynamic forces do a much better job of holding you down during
>> the turn than gravity.  This also lets you use Mars rather than Jupiter
>> for outer-planets missions, which is nice because Jupiter's Van Allen belts
>> are a major hassle for Jupiter gravity assists.
>
>Anyone in netland doing any research with high
>velocity waveriders?

No, I don't work in this area, but I can provide you with a reference.  Armed
with the AIAA paper number, you should have no trouble locating this paper
in a decent engineering library.

"Hypersonic Maneuvering to Provide Planetary Gravity Assist"
 AIAA 90-0539

 A. McRonald and J. Randolph
 Jet Propulsion Lab.
 Pasadena, Ca

 28th Aerospace Sciences Meeting
 January 8-11, 1990/Reno, Nevada

 Abstract:  In a previous papaer the authors analyzed aero-maneuvers at Venus
 and Earth.  In this paper they extend the study to Mars, examining the
 potential of aero-assist maneuvers at Mars for missions to the Sun and to
 Pluto, using a high lift/drag vehicle such as the waverider to perform an
 atmospheric "fly-around" of Mars, in order to rotate the plaentocentric
 velocity vector, thus adding to the rather small rotation due to gravity
 alone.  A fly-around in one direction or the other can place the aphelion or
 the perihelion of the resulting orbit at the Mars distance, for missions
 towards the Sun or towards Pluto, respectively.  The parameters of such
 maneuvers are given as a function of Earth launch velocity.  It is found to
 be advantageous in terms of Earth launch velocity to perform two aero-
 maneuvers, e.g., one at Venus and then one at Mars.  Some problems regarding
 the actual implementation of the aeromaneuvers are discussed.
--
	Andrew J. Higgins
	ahiggins@pequod.cso.uiuc.edu