I'll try another way..
SYP WYP HUMPOL DERBY
These figures are the multiplied out speeds for the various a/c from the NPAS chart.
ie distance (NMs.?) divided by time (minutes) mulitplied by 60 to give knotts or MPH depending on what NPAS used.
.
AVERAGE A/C SPEEDS
sheffield...... SYP... 61........WYP .....114.... HUMB.... 125.... DERBS.... 113
darnall........ SYP..... 31.......WYP.... 115......HUMB ....125....DERBY.....112
heeley..........SYP......65.......WYP.....116.....HUMB...... 127....DERBY.....115
fox house.....SYP......78.......WYP.....115.....HUMB......127... .DERBY.....114
ecclesfield....SYP......74........WYP....112.....HUMB......1 26....DERBY.....118
orgreave.......SYP.....43........WYP....115.....HUMB.......1 27...DERBY.....116
rotherham.....SYP.....52........WYP....113.....HUMB.......12 6....DERBY....118
doncaster......SYP....101.......WYP....115.....HUMB.......12 2....DERBY....123
barnsley........SYP....100.......WYP......96.....HUMB....... 127....DERBY.....121
sorry about the rubbish formatting but its te best i could do for now..
If i figure out how to do it ill put the full chart on..
So I just wondered why the SYP aircraft is so slow, when the humberside a/c is very fast..?