Just a note about the take-off at NW;rwy 02 is downsloping about 1.5% for approx half it`s length,and the first third of it`s length is asphalt,then concrete.There are numerous `patch` repairs to the asphalt and a couple of `ripples`across it,which can cause the nosewheel to bounce on take-off or landing.The crosswind at the time was 160/10,but it can be variable along the runway length. The aircraft took approx 28 secs to be airborne,using the video on utube .Other videos of similar Hunters taking-off,also appear to be airborne in a similar timeframe.Aircraft acceleration initially also appears to be about 13-14 ft/sec/,for a thrust/wt. ratio of about .405..
Another reason to use 02 is that the overrun,and initial departure is over open ground,whereas,20 is `uphill` and over a main road ,golf course and trees.Landings are usually done on rwy20,,accepting light tailwinds by the Gnats and Hunters.
I was at NW preparing to fly a JP,and would have used 02 for departure ,but as word about the accident caame ,cancelled as the `fuel` was quarantined` in case it had been contaminated.