3 ms·
> A hybrid aircraft is going to have smaller engines that produce less thrust, True. > and probably take longer to get to max thrust False. But it is not imp
by simne 3y ago
> A hybrid aircraft is going to have smaller engines that produce less thrust,
True.
> and probably take longer to get to max thrust
False. But it is not important.
For passenger planes, usual, to have rich wing mechanization especially mentioned model is one of most sophisticated on this.
But mechanization have huge drawback - it usually increase Cx very significant when activated, so engines must run with moderate power (without mechanization, descending made with throttled engines to near zero).
After touchdown, plane is technically on ground, but in reality it usually have very high speed, or huge kinetic energy.
When engines ok, on nearly all civilian planes, they turned to reverse and braking (military planes usually don't have reverse).
And only after speed slowed to ~150km/h (approx 100mph), activated wheel brakes.
And this is not because I want to do so, but because kinetic energy is too high for wheel brakes, and because it is just extremely dangerous to brake the wheels on so high speed.
Some decades ago, plane constructors even included special ballast to breaks to accumulate heat from plane braking, and for example, Concord does not have reverse, totally depend on wheel brake, for it created ABS system, and it's breaks cooled approx 11 hours.
You don't hear me. Regulations consider worst case, so for this plane, will be required longer strips than for original (non-hybrid). Nothing less, but nothing more.
- simne 3y agoFor speed and brake issue, remember kinetic energy formula - energy grow as square of speed.