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When the U.s.a. finally decided to evacuate its troops, diplomatic officers, and local allies from Vietnam in 1975, the biggest problem was a lack of helicopter landing zones. The land had left the job so late, it had no choice but to conduct the evacuation with choppers that required big, level clearings — and the United states embassy had nothing of the sort, beyond the roof. Heroic efforts were required to stop the job, including having soldiers chop down trees and even button unneeded helicopters into the ocean. But that was 1975 — surely modernistic applied science has come up with something improve, by at present?

Well, non really. Helicopters offering more control to pilots than ever earlier, but yous'll notwithstanding need to exist 1 hell of an ace if you want to put downwardly safely on anything other than a groomed landing strip. That's a trouble if you lot're conducting military operations in, say, multiple desert countries, or in ancient, bombed out Mesopotamian cities. These areas are often light on easy landing zones, just strategically require all-encompassing apply of helicopters — not a good state of affairs.

At present, DARPA has an idea that could permit helicopters land on only about anything — no matter how uneven.

The thought comes back to DARPA'due south favorite new discussion: autonomy. The idea is to requite helicopters four independently controlled, autonomous legs with congenital-in distance sensors. These legs can run into the topology of the ground below them, and adjust their elevation appropriately, to keep the helicopter body level. This could allow a chopper set down on the side of a slanted roof, the side of a mount, or merely on a highly irregular surface, like a battlefield pock-marked with mortar holes. And since the legs can fold inward as the chopper descends, they can do some shock absorbing to cushion unavoidable hard landings to reduce the risk of damage or injury to passengers.

Thanks to DARPA, scenes like this could be very avoidable, very soon.

Thanks to DARPA, this sort of thing could be unthinkable, very presently.

It could even make helicopters more useful for the Navy, assuasive safe landings fifty-fifty during choppy weather with rocking landing decks; it should be able to conform its orientation while on the ground, potentially swaying with the deck of the ship and keeping the whole from tipping. DARPA's official statement about the project says information technology could handle up to a xx caste grade.

The legs fold up when the helicopter is in flying, like the landing gear on a plane. It'due south merely been tested with large remote control helicopters, not yet with a full sized version. That full sized version should't be all that much heavier than regular helicopter landing struts, since they volition exist hollow, made of metallic scaffolding.

This is all part of DARPA'due south Mission Adaptive Rotor (MAR) project — an attempt to bring the unique capabilities of helicopters into the side by side generation. This landing gear initiative would greatly advance the role of helicopters every bit the versatile alternative to fixed with aircraft — simply it's non all DARPA's been working on. Their vision for the VTVL aircraft would include democratic, modular cargo carriers that could switch between troop transport, cargo conveying, and fifty-fifty combat roles.