G-Tech Hp Meter Update

[jfaubion]

Hello Bruce,
I read your response and am curious about parts of it. For example the 
following equation for air density:

  AirDensity=0.0228645 * barometer(In Hg)/(0.5555* (temp - 32) + 273.15) 
  
I understand the barometer and the ((temp - 32) + 273.15) to get degrees Kelvin 
I'm sure the constants 0.0228645 and the 0.5555 are for unit conversion but how 
are they derived? Also concerning the next equation:

  AeroDragFactor = 1.07556 * AirDensity * Coeff_Drag * Frontal Area

Again the 1.07556 is probably for unit conversion, how is it derived. This is an
area that always intrigued me. Thanks for bringing up the topic.

John Faubion
jfaubion at cs-smtp.tyndall.af.mil