PPRuNe Forums - View Single Post - Rejecting A Takeoff After V1…why Does It (still) Happen?
Old 9th Nov 2010, 09:18
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homebuilt
 
Join Date: Mar 2005
Location: Feet on the rudder pedals
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"...decision was very likely based, in part, on the perception of available runway to stop the airplane."
Be careful with that illusion, because past V1, especially at max gross weight, [eg:B747] the available brake energy is in La-La-Land. The brakes will go on vacation before the pavement ends...and then you just keep on rolling and rolling!
On the jet airplanes I'm flying / used to fly on, all within "H" category, a chart shows the Vmbe: max brake energy. Of course V1 must be lower than Vmbe, it's mandatory (as well as V1 equal or higher than Vmca). On the airplane I'm currently flying on, V1 is around 160 kts at MTOW (ZP = 0, ISA) and Vmbe ~ 185 kts in the same conditions.

If I understand, that means that if I reject my T/O above V1 on a balanced runway I'll get out the runway but my wheelbrakes will be working as long as I didn't reject my T/O at a speed higher than Vmbe.

Just my two cents.
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