----- Original Message -----
From: Ed Anderson <eanderson@carolina.rr.com>
Date: Tuesday, December 9, 2003 12:32 pm
Subject: [FlyRotary] Re: Air Density at altitude


>  Heat transfer equation Q =W*DeltaT*Cp, with W = mass flow down
> by 30%.  So to get rid of the same Q of heat (and since Cp doesn't
> change that much)  it would appear that means the delta T term
> would need to increase by 30% for Q quantity to remain the same.  
> But, I don't know exactly how a 79Deg colder incoming air would
> affect the Delta T term.
>
>  BIll??
>
>  Ed Anderson
>

Wouldn't the percentage change in DeltaT (DeltaDeltaT?) have to be measured from absolute 0?  An 80degree change would then represent...what?... about 20%?