Thank you Peter, I duly appreciate your respose. My other question is how do I estimate the weight of the space craft?, from the equation you posted i wld have to knw what the space craft weight is. Is here any equation out there to estimate the weight of space craft as we do have for aircrafts?.
Also how can you relate the amount of propellant burn to the height ascent? any equation that relates the two together like we have for aircraft.( i.e. specific thrust and range)
Cheers.