PPRuNe Forums - View Single Post - Boeing 80 knot call v Airbus 100 knots. Why the difference.
Old 8th Feb 2010, 15:14
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TheWanderer
 
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Originally Posted by despegue
Eh Denti,
Are you sure about a V1 of 100kts?... Remember Vmcg?... it is around 116kts. on most models afaik. This is sadly not always depicted on performance charts.
Vmcg is not a static value but changes with engine rating and air density (temperature&pressure altitude).
On most B737, 118 kt sounds familiar as it is a conservative value (actually the max Vmcg for a 22k engined aircraft) that was put in the QRH by Boeing.
If you look to the actual Vmcg charts in the performance manual, you will find also other values, especially lower Vmcg at higher temperatures and/or lower engine ratings.

For example a B737-300 with 22k engines installed has a Vmcg between 94-118 kts, while the same aircraft with 20k engines has a Vmcg between 94-113 kts, depending on temperature and airport elevation. (Values are taken from B737-300 FPPM)
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