Fullwings
if you use assumed temperature derates on your average <3,000m (10,000') runway, you will frequently end up with a balanced field, i.e. ASDR = TODA so a V1 reject will use it all, no matter where you start from.
Just in case others are as dim as me, can you elaborate? It seems to me that when you take the full length available, rather than taking an intersection, you are increasing the TODA while the ASDR remains constant (expect perhaps for minor net slope variations).
Conversely, when you take an intersection you reduce the TODA, with a constant ASDR.
The ASDR, being a function of the aircraft condition and weight, together with ambient met and other parameters, won't change, will it, unless you use different power settings to reduce it to match the TODA? Is that the basis of your argument?
If you are saying that you you simply use a higher power setting for the intersection departure, so it's just as safe as taking full length at lower power settings, I'm not sure I really buy that. Most of the unknown variables are still present in the calculation.
It seems also to have a flaw in so far as it raises the question; "why not maximise safety and use the same - higher - power setting you would have used from the intersection, but taking the full length?".
I'm fumbling here, as you can probably tell. Can you elucidate a bit?