Re: FW: Shuttle water dump while attached to ISS

From: Jonathan T Wojack (tlj18@juno.com)
Date: Tue Sep 25 2001 - 11:35:49 EDT

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    The following interesting equations were sent by Antonin Vitek on
    SeeSat-L.
    
    > > If RCS is indicative of true cross-sectional area, drag force 
    > increases with
    > > RCS.
    > > But the EFFECT of the force decreases with more mass of the 
    > affected object.
    > 
    > Exactly speaking (in equations):
    > spacecraft decelaration is given as
    > 
    > a = (1/2).cx.(A/m).rho(h).v.v
    
    My question is: do the dots (.) means multiplication?
     
    > where cx - aerodynamic coefficient (depending on shape of object)
    > A - effective cross-sectional area of spacecraft
    > m - mass of spacecraft 
    > rho(h) - atmospheric density at given height h
    > v.v - velocity (squared)
    > 
    > For a circular orbit with major semiaxis a, the change (decay) of 
    > semiaxis per orbit is given as
    > 
    > delta a = -2.PI.cx.(A/m).rho(h).a.a
    > 
    > Consequences: for spacecraft of silimilar shape the decay is
    > proportional to the A and inversely proportional to the m (PI is 
    > Ludolph
    > number, 3.14159265....)
    
    ------------------------------
    Jonathan T. Wojack                 tlj18@juno.com
    39.706d N   75.683d W           
    http://www.angelfire.com/stars2/projectorion
    4 hours behind UT (-4)
    
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