PPRuNe Forums - CP's and PNR's

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anthos92

14th Apr 2013 01:07

CP's and PNR's

I've just started self studying for the CPL Performance exam.
Would anyone be able to tell me the simplest way to calculate the following CP and PNR questions on a basic electronic calculator to achieve the answers shown in bold?
Any help would be much appreciated.
Cheers,

http://imageshack.us/a/img13/6197/98092049.png
http://imageshack.us/a/img850/5060/pnr.png

galaxy flyer

14th Apr 2013 01:40

Please do a search--many informative threads on the subject

GF

Arm out the window

14th Apr 2013 01:53

What reference materials have you got? The formulae should be readily available, then you just have to crunch the numbers.

Do you know the H/(O+H) rules, where H is groundspeed coming home and O is groundspeed out?

Distance to CP = total leg distance x H/(O+H). Then you have to convert that to time using groundspeed out.

Time to PNR = endurance x H/(O+H). Then convert to a distance using g/s O.

anthos92

14th Apr 2013 06:08

CP's and PNR's

Thanks for the help, I was making a vital error with my calculator and almost pulling my hair out trying to work out why I couldn't come up with the right answers.
Thanks,

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