Launching model rockets on the moon

Launching model rockets on the moon

Post by Tonn Tonnis » Wed, 20 Jul 1994 02:02:44



Quote:

> 7)      The rocket will be moving quite fast when this happens.  Since there
>                is no atmosphere there is no drag.  The only force to slow
>                the rocket is the pull of the moon's gravity.  Within the time
>                frame of the typical 6 second delay, the moon's gravity won't
>                have slowed the rocket down very much.  The rocket will
>                be still rapidly flying away from the moon's surface when
>                the ejection charge blew.  The nose cone pops off.

Keep in mind that without aerodynamic drag, a rocket's stability will
be governed only by the force vector of its thrust at the nozzle, in relation
to its center of gravity.  Beyond this, there is no promise our "moon" rocket
will maintain any kind of direction, let alone be traveling upward when it
leaves the launch rod (thus, NASA-type space vehicles use retrorockets).  
Rockets per se are not space vehicles; rather, they are "atmosphere" vehicles,
devices used to put "space" vehicles out where they belong.

-Mark
________________________________________________________________________
 (\/)    (__)._  _   _) _)      Department of Physics, Oregon State Univ
 (  ).   (   ( '(/_ (_)(_) (_)  Corvallis, OR 97331