Yes, the outboard engines are often near the edges of runways where debris usually gathers. They would likely create a debris cloud, so the outboard engines do not have reversers.
Think torque and momentum arm.
The debris is not located any differently than it is at takeoff. If the airport and runways can survive the debris cloud of an Airbus 380 taking off with all four engines at full throttle it can surely handle the same plane landing on the same runway.
Yeah that was one of the first things that came to mind.
If the aircraft wasn't designed from the start with thrust reversers in mind then the wing structures might not have enough strength, reinforcement, structural integrity(?) or whatever the engineering term is for being structurally sound enough to safely handle reversers on all four engines.
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Could be that its just not necessary. slam on four high powered brakes and peoples stomachs could be flying out their mouths or just extremely uncomfortable for passengers? I assume that for the most part there is little control over the degree to which these brakes are applied. Either on or off. Maybe halfway, but even that might just be too much.
yes but can you land it on a treadmill
Thrust reverser power is controlled by the throttles. The pilots are in 100% control of how must reverse thrust is applied.
Perhaps. It depends how the design was optimized.It seems very unlikely that a wing designed to handle 10s of thousands of pounds of thrust in one direction can't handle a small amount of thrust in the other direction.
:hmm:It always possible to land a plane.
:hmm:
I guess even if you ditch in water, it'll eventually sink, and thus land.
yes but can you land it on a treadmill
Thanks for a concise explanation. Adverse yaw works both waysGents,
Vmcg is why. Vmcg = Velocity, Minimum Control, Ground
A failure of an outboard thrust reverse mechanism would create a yawing moment greatly in excess of the aircrafts' control surfaces and/or nosewheel steering to maintain control.
In short, a failure would cause the aircraft to veer off the runway and potentially ground loop.
Other aircraft that have outboard reverse typically have a derating mechanism to restrict total thrust available below a certain speed.
Hope that helps...
Signed,
An aerospace engineer, and a pilot...
Thanks for a concise explanation. Adverse yaw works both ways
The debris is not located any differently than it is at takeoff. If the airport and runways can survive the debris cloud of an Airbus 380 taking off with all four engines at full throttle it can surely handle the same plane landing on the same runway.