Re: DIRECT question for Oberg, Simberg, Spencer, et. al.

On 12 Sep, 22:02, Hop David <h...@xxxxxxxxxxx> wrote:
Ian Parker wrote:
Quadruture is when a spacecraft leaves Earth, goes to Mars, then
returns to Earth. It is similar to the bouncing off planets done by
Cassini.

Aldrin proposes a Mars cycler that passes by earth and Mars each
earth-Mars synodic period (about 15/7 years). The cycler to Mars taxi
delta vee is quite high and the cycler's apsides need frequent
adjustment for which gravity assists don't suffice.

Requiring less delta vee but making less frequent planet to planet trips
are the Niehoff VISIT 1 & 2 cyclers.

Are you talking about one of the above or something different?

I was assuming the high delta v case with ion drive. The basic
argument is this. If you have a manned trip to Mars (or indeed any
trip with a perishable cargo) you don't want ion drive as it is too
slow. If you have manoevered previously into a quadrature that proble
has been solved for you.

Mind I am skeptical of the whole idea. If you made an unmanned trip to
Mars you would simply go to LEO, use ion propulsion and be done with
it.


- Ian Parker


.

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