Re: Brute force re-entry

From: Erik Max Francis (max_at_alcyone.com)
Date: 09/09/04

  • Next message: Mike Miller: "Re: Brute force re-entry" 
    Date: Wed, 08 Sep 2004 17:32:49 -0700
To: sci-space-tech@moderators.isc.org

    Mike Miller wrote:

    > Orbiter with typical ET residuals (15,000lbs): 200,000lbs
    > Orbiter after expending residuals: 185,000lbs
    > Specific impulse of the SSMEs in vacuum: 455 sec^-1.

    Specific impulse (when measured this way) is measured in seconds, not
    inverse seconds.

    > (455 sec^-1) x (9.8m/s/s) x Natural Log (200,000lbs / 185,000lbs) =
    > 347 m/s.

    As this equation can attest to; s^-1 times m/s^2 is m/s^3, not m/s. 

    -- 
 __ Erik Max Francis && max@alcyone.com && http://www.alcyone.com/max/
/  \ San Jose, CA, USA && 37 20 N 121 53 W && AIM erikmaxfrancis
\__/ Never had very much to say / Laugh last, laugh longest
    -- Des'ree
  • Next message: Mike Miller: "Re: Brute force re-entry"