Bigmosquito,don't reduce the V1 too much with the clearway credit.
Balanced(old fashioned now),used to be the same distance to Acc/stop,as go' to the 35' screen at the end of the 'dry' runway.
With the credit of the clearway,and providing one could still stop on the concrete,one was allowed to increase the Towt.
Wet'conditions introduced the 'reduced 'V1(to enable the A/craft to stop,at the same weight,on the runway.The 15' screen,was a compromise,to allow the a/craft to go!!!!.
The present quandary ,is that the 15'screen is at the end of the clearway(JAR25.111).In reality one crosses the 'end' of the concrete at about 8/9'
