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 Considerations For Determining Runway Length
 naruto38700 From Singapore, joined Dec 2012, 7 posts, RR: 0Posted Mon Dec 31 2012 10:41:33 UTC (2 years 7 months 6 days 14 hours ago) and read 4515 times:

 I understand there are a lot of factors taken into consideration when you are actually building a runway. Among them we have wind condition, critical aircraft, maximum stage length, aerodrome altitude etc. The problem is, I know that those factors are there, but still no idea how they influence runway length numerical. Is there a formula to quantify the most optimum runway length using those stats? For instance, lets say we have prevailing wind 050° at 20 knots, critical aircraft is A380 with the stage length of 13,500 km. What runway length will it be then? Wish you all a very happy new year, gain your wings and soar higher in 2013!
 tdscanuck From Canada, joined Jan 2006, 12710 posts, RR: 80 Reply 1, posted Mon Dec 31 2012 14:36:13 UTC (2 years 7 months 6 days 10 hours ago) and read 4476 times:

 Quoting naruto38700 (Thread starter): The problem is, I know that those factors are there, but still no idea how they influence runway length numerical. Is there a formula to quantify the most optimum runway length using those stats?

There is no formula. What you need are the lookup tables for takeoff performance.

 Quoting naruto38700 (Thread starter):For instance, lets say we have prevailing wind 050° at 20 knots, critical aircraft is A380 with the stage length of 13,500 km. What runway length will it be then?

13500 km is into the part of the payload/range curve on an A380-800 where you have to take a payload restriction to carry enough fuel, so we assume you're at MTOW. MTOW on the A380-800 varies wildly depending on which specific aircraft you're talking about, but we assume 575,000 kg as the high end. At that weight, 0', ISA standard day, you need 9200' minimum (full thrust takeoff, using the whole runway). More would be better. You don't take credit for wind for runway planning because you can't count on it. If the runway is at altitude or it's a hot day, you need more length.

All the information you need for a question like this (to get a rough answer) can be found in the ACAP documents:
Tom.

 UA787DEN From United States of America, joined Dec 2012, 428 posts, RR: 0 Reply 2, posted Mon Dec 31 2012 16:15:24 UTC (2 years 7 months 6 days 8 hours ago) and read 4449 times:

 Also, Runways are often built for longest-case scenarios. Add in Altitude, and the A380 needs more to take off. And then with the extra built in for safety, a runway built for an A380 won't be 9200'. It will be built for MTOW on a warm day with a tad bit extra. Say 13,000' at least.
 RussianJet From Belgium, joined Jul 2007, 7779 posts, RR: 20 Reply 3, posted Mon Dec 31 2012 16:33:42 UTC (2 years 7 months 6 days 8 hours ago) and read 4439 times:

 How about available space? Seems to be a pretty strong determining factor in many cases - how much land is actually available.
 ✈ Every strike of the hammer is a blow against the enemy. ✈
 naruto38700 From Singapore, joined Dec 2012, 7 posts, RR: 0 Reply 4, posted Tue Jan 1 2013 06:44:44 UTC (2 years 7 months 5 days 18 hours ago) and read 4346 times:

 The available space is for me to determine, and it depends largely on the runway. A lot of info I can get from the ACAP document. There is a curve for the runway length needed! So I will just refer to the graph and determine the the length with some assumptions. Thanks guys, all your answers are sincerely appreciated!
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