Talk:Propellants

Just two questions here: 1)Does anyone happen to know how to calculate the specific impulse of a given propellant combination? I'm thinking Propellant-grade hydrogen peroxide and alcohol for a lunar lander, but I'm not sure about calculating the Isp for that particular combination.

2)The other thing regards unmanned cargo landers: Anyone looking into solid propellants for landing? Perhaps a 'rough-rider' system that came down like a semi-controlled bomb and used solids to brake velocity even with high acceleration loads. . . ?