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Old 6th January 2012 | 11:31
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Centaurus
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Joined: Jun 2000
: ATP+Mil
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From: Australia
depending on the type of aircraft, the actual take off mass as well the flap setting for t.o you may be brake energy limited regarding the split between v1 and vr .
Tontouta airport, New Caledonia has a long runway (10,000 ft plus) with significant obstacles close in for take off runway 11. Many years ago the company I was with often operated to Tontouta. In the 737-200 with JT8D-17 engines we were obstacle limited for departure 11. To counter this our performance engineers designed a runway analysis for runway 29 (no obstacles in that direction) and with a 10 knot tail wind and a 23 knot spread between V1 and VR we could take off at max structural (53 tonnes). The V1 was low enough even with a 10 knot tail wind to make a relatively comfortable abort. On the other hand the runway was long enough to permit the long take off run on one engine to take up the 23 knots of V1/VR spread.
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