compressor stall

18th Sep 2007, 12:38

I am trying to reconcile the actual with the theoretical and having trouble with it - possibly the units.

Vmbe is a function of how much kinetic energy the brakes can stop (using worn brakes to the overhaul limit).

So with 70mj brakes the kinetic energy is = 1/2mv^2.

If you know your mass (as you would for take off!) you should be able to get a reasonable approximation of V1?

However, I have tried all sorts of permutations with units but cannot make it work, even roughly. I have tried to reverse the formula using performance data but cannot get anything within the range of 70mj (in order to account for the worn brakes).

Can anyone help?

Vmbe is a function of how much kinetic energy the brakes can stop (using worn brakes to the overhaul limit).

So with 70mj brakes the kinetic energy is = 1/2mv^2.

If you know your mass (as you would for take off!) you should be able to get a reasonable approximation of V1?

However, I have tried all sorts of permutations with units but cannot make it work, even roughly. I have tried to reverse the formula using performance data but cannot get anything within the range of 70mj (in order to account for the worn brakes).

Can anyone help?