PPRuNe Forums - View Single Post - assumed temp
Thread: assumed temp
View Single Post
Old 26th March 2005 | 13:46
  #23 (permalink)  
Empty Cruise

ECON cruise, LR cruise...
20 Anniversary
 
Joined: Apr 2002
Posts: 569
Likes: 0
From: MIRSI hold - give or take...
fish

Hi Alex et al...

Had me physics book out in broad daylight for the first time in many years. No matter how I tried to set up the equation - it always came out with mass on one side and mass on the other side as well. I therefore - perhaps falsely - see them cancelling eachother out exactly, i.e. when comparing braking force available with braking force required, the mass is not a factor, only mju & speed squared. Trying to do the calculation for the same speed (the V1 for 53 T) and mju, but varying the mass (48 T vs. 53 T), I always come up with brake force required being less than brake force available when keeping the speed for 53 T.

The lower V1 for 48 T - well, AFAIK, the FCOM will give you only data for V1min or V1improved, depending on what table you use, whereas the GWC will give you the relevant speed for the particular rwy (i.e. only use V1min when absolutely necessary due field length or close-in obstacles), and as OS said, take into account unbalanced T/O etc. In that way, we are perhaps comparing oranges and apples here?

And regarding the tank - yes, especially firing the gun with level barrel straight ahead & a set of new tracks will do the trick - you think I could have those as a re-fit on the Merc?

Brgds from
Empty
Empty Cruise is offline