a) the CJ1 has no thrust reversers, just attenuators They have a marginal effect on aborted takeoff (5%)
5% isn't a great deal, but my point was basically about Yogibaboo being happy to use the ACTUAL runway length as shown in the AFM, while others are applying fudge factors.
always excluding T/Rs
True.... the AFM states how the landing distance was derived.... in our case..
1. Immediately after touchdown, the nose was lowered and full brakes were applied. Auto ground spoiler deployment was initiated at main gear touchdown by wheel speed spin-up. If the auto ground spoiler system was not armed, the speed brakes were manually deployed after brake application, and appropriate time delays have been included in the landing distances for this procedure. Credit was not taken for reverse thrust.
We use the 60/40 rule, although the shortest runway that we use is Luton, so that's about 2x Actual Landing Distance, and we consider that "Short"
Mutt