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60 votes
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Why don't airports use arresting gears to recover energy from landing passenger planes?

The energy unit costs for companies in Germany are much lower than for households. Where as a citizen you pay approximately 30 ct / kWh, the airport will pay much less, probably around 15 ct / kWh. ...
DeltaLima's user avatar
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36 votes
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Slanted Brown Rectangles on Aircraft Carriers?

The rectangles are called impact pads. The ends of the arresting cable tend to snap back onto the deck after an aircraft catches it. The replaceable polyurethane pads protect the carrier deck from the ...
fooot's user avatar
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24 votes

Slanted Brown Rectangles on Aircraft Carriers?

Good answer by fooot already, but to add some detail, it isn't the cables themselves as much as this beefy steel "knuckle" connecting the more readily replacable cross-deck pendant to the ...
Michael Hall's user avatar
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23 votes

Why don't airports use arresting gears to recover energy from landing passenger planes?

You can't simply stick an arrestor hook on a passenger airplane, the fuselage is not designed for the forces that a rear hook would impart. Carrier airplanes are designed from the beginning for ...
GdD's user avatar
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16 votes

Why don't airports use arresting gears to recover energy from landing passenger planes?

Summary: It isn't worth it financially, quite apart from any other aspects: The 'savings' would be "lost in the noise" of operating an airline service- they are absolutely minuscle compared to all ...
Russell McMahon's user avatar
11 votes

Why don't airports use arresting gears to recover energy from landing passenger planes?

Beyond the other issues mentioned here, let's accept your 75,000 euro/year number for a second and ignore the impossibility of retrofitting aircraft. How many people does it take to operate the ...
Zach Lipton's user avatar
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6 votes

Why don't airports use arresting gears to recover energy from landing passenger planes?

One more nail in the proverbial coffin... Let's say for a second that the airport could install a system like this at zero cost, not entirely unlike the assumption in Zach Lipton's answer. Let's ...
user's user avatar
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5 votes

Why don't airports use arresting gears to recover energy from landing passenger planes?

Setting aside the costs and complexities of such a system, it's also important that the energy you can recover this way is limited to the aircraft's kinetic energy at touchdown. This is a small ...
Will's user avatar
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4 votes

Why do the arresting gear cables need to be pushed/ guided back?

Most likely, it is to avoid this kind of situation: Retraction sometimes causes formation of long, loose helical loops in the deck pendant. Such loops are usually eliminated as tension increases on ...
ocirocir's user avatar
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3 votes
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What is the rationale behind placing arrestor gear on a long runway?

I can think of 4 reasons: Pilot Training to use the cable arresting system Rejected takeoff, fighters don't usually have reversers and may take long space to arrest Under certain bad runway ...
ocirocir's user avatar
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2 votes

Why isn't the arresting hook always used on land?

An additional answer not discussed yet is the effect it would have on the runway. If you've ever seen the deck of the carrier in the impact zone, you know that it is hammered all to hell from the ...
root1657's user avatar
  • 483
2 votes

Why isn't the arresting hook always used on land?

I served USAF as a tactical aircraft (fighter jet) maintenance technician (aka Crew Chief). F-15's are a land-based aircraft, and have an arresting hook, and the runways have arresting cables. However ...
Rayanth's user avatar
  • 279
2 votes

Why don't airports use arresting gears to recover energy from landing passenger planes?

To put things in perspective, 75000€ is the amount an airline will pay in compensations and duties of care on a single flight with ~100 passengers arriving late. So, if a single flight per year is ...
Dmitry Grigoryev's user avatar
1 vote

Why don't airports use arresting gears to recover energy from landing passenger planes?

If a plane needs to go around after touchdown (eg: runway incursion), but its already caught on the arrester system, that is one bad scenario. If the arrester system fails after being caught, then ...
abelenky's user avatar
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1 vote

Why don't airports use arresting gears to recover energy from landing passenger planes?

So what you are suggesting is to replace a well-tested process for stopping planes, self contained and redundant (brakes) by a complex mechanism which fundamentally takes away control from the captain ...
Sascha's user avatar
  • 161
1 vote

Why don't airports use arresting gears to recover energy from landing passenger planes?

No need to modify any airplanes. You would make the first half of the runway just past the touchdown strips into a conveyor belt. The conveyor belt uses radar to determine the aircraft's ground ...
Harper - Reinstate Monica's user avatar
1 vote

Why isn't the arresting hook always used on land?

Many air forces throughout the world in fact do use runway arresting gear during flight operations and a glance through an Airport/Facility Directory will reveal that even many large civilian airports ...
Romeo_4808N's user avatar
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