FORMULA,S FOR PNR AND CP
Guest
Posts: n/a
CP
D *[H]
------=CP distance from dep.
[O+H]
D=Distance
H=GS Home@ N-1
O=GS Out@ N-1
CP dis.
------=ETE to CP
GS @all eng
PNR
constant fuel flow D = (E * O * H)/(o+H)
d=(endurance (hrs) * g/s out ) g/s home)
___________________________________
G/s out + g/s home
flow = kg per gnm
____
G/S
G/s = gnm per kg
____
flow
I think
[This message has been edited by dv8 (edited 20 June 2001).]
D *[H]
------=CP distance from dep.
[O+H]
D=Distance
H=GS Home@ N-1
O=GS Out@ N-1
CP dis.
------=ETE to CP
GS @all eng
PNR
constant fuel flow D = (E * O * H)/(o+H)
d=(endurance (hrs) * g/s out ) g/s home)
___________________________________
G/s out + g/s home
flow = kg per gnm
____
G/S
G/s = gnm per kg
____
flow
I think
[This message has been edited by dv8 (edited 20 June 2001).]
Guest
Posts: n/a
Here is a little tip for your friend to remember which way round the PNR formula goes.
It is "Scotland sits over England" ie:- Cross of St Andrews (times sign) is over the cross of St George (plus sign).
Sad I know but every little helps in those pesky exams!
[This message has been edited by airtaxi (edited 23 June 2001).]
It is "Scotland sits over England" ie:- Cross of St Andrews (times sign) is over the cross of St George (plus sign).
Sad I know but every little helps in those pesky exams!
[This message has been edited by airtaxi (edited 23 June 2001).]
Guest
Posts: n/a
Engineer,
A Crit Point (CP) is another name for the Equal Time Point (ETP). The answer given above for CP distance is therefore the ETP distance from departure. If you divide this distance by the groundspeed (outbound), you get the time to the ETP/CP.
A Crit Point (CP) is another name for the Equal Time Point (ETP). The answer given above for CP distance is therefore the ETP distance from departure. If you divide this distance by the groundspeed (outbound), you get the time to the ETP/CP.