RE: RE: [FT] Orbit and FT

Randy Wolfmeyer wrote:

>Over the poles, you just have to use thrust to counteract the
acceleration
>of gravity, so if you want to maintain an altitude of 2*radius of earth
>about pole, you need to be able to use thrust that would provide 1/4 G.
>(gravity goes as 1/r^2).

Err... yes, if you measure the altitude from the center of the planet 
rather than from the surface. At an altitude of 2*radius of Earth above
the 
*pole* (which is 3*radius from the center of the planet), the required 
thrust is only 1/9 G.

Later,

Oerjan
oerjan.ohlson@telia.com

"Life is like a sewer.
  What you get out of it, depends on what you put into it."