OC619, the figures are 71% of L/O Speed by 50% TORA. It is an acceleration `checkpoint` and derived from the equations of motion; if you can`t measure/estimate 1/2 Tora,you can time it by `backworking `the POH distances.Works fine. Authority-D.Stinton ,Ex-CAA TP.
S=u+v^2 x t
S=ut + 1/2at*
V*=U* +2aS
*=sqd.^=divided, S=dist,a=accel,u=initial velocity,v= final velocity,t=time; 60
kts =100 ft/sec.
The other 50% TORA is SDA...
Last edited by sycamore; 14th Mar 2009 at 18:28.