Five Aircraft Ideas NASA Is Exploring

NASA does a lot more than just explore space. It has also long been inventing new ways to make flying safer and more efficient. To add to its successes in aviation, NASA recently selected five areas of aerospace technology to explore over the next two years as part of its Convergent Aeronautics Solutions project (a less-than-inspiring name and acronym). While NASA doesn’t promise success, in real R&D, even failures teach something.

Here’s a look at the five topics being investigated:

Fuel Cells for Aviation

NASA has been using fuel cells successfully since Gemini space flights in the mid-1960s, and there have been aircraft that have tested them out as well. This program intends to see if a new type of fuel cell can power all-electric and hybrid aircraft. This fuel cell extracts hydrogen from standard aviation gas and oxygen from the air, then combines to generate electricity. Exhaust gases from the fuel cell would also be used to increase energy by pushing them through a turbine.

It’s estimated that the fuel cell would generate energy more efficiently than if the fuel went to a piston engine, thus saving fuel and reducing emissions. The technology can already be supported by airports as it wouldn’t require new facilities or equipment.

Printing Electric Motors
As NASA pursues all-electric aircraft, it is also exploring whether motors themselves can be made more efficient with higher levels of power density. This program will try to determine if the increasingly capable process of 3D printing can manufacture electric motor parts that are significantly lighter, perhaps smaller, and made with materials that will give the final motor higher power densities.

Lithium-Ion Batteries for Aircraft

One potential hurdle engineers must get over before electric aircraft are viable is being able to store enough electricity for aircraft, even small planes, to make long flights. Traditional batteries are heavy, and weight is the bane of aerospace engineers. One possible solution is lithium-air (Li-Air) batteries, which have the highest theoretical energy storage capacity of any battery technology.

Li-Air batteries, or “breathing batteries,” pull oxygen in to react with lithium ions as it discharges. Then the battery expels oxygen as it’s charged. Unfortunately, standard electrolytes—the internal material that lets electrons move quickly—decompose in Li-Air batteries during operation. So after only a few charge/discharge cycles, the battery is useless.

NASA researchers will investigate the feasibility of designing novel, ultra-stable electrolytes that resistant decomposition and the batteries last longer, letting electric aircraft fly farther.

Folding Wings

Over the years, NASA and other aerospace engineers have discovered that an aircraft’s vertical stabilizer needs to be sized so that it can keep the plane centered on the runway in the event of engine failures during takeoff or landing. After the plane is cruising at altitude, the large tail just adds drag, which contributes to the plane’s weight and fuel consumption. It also creates more noise than a smaller tail would.

NASA will be experimenting with wings with a good-sized outer portion at the tips that can fold up or down as needed to act as a rudder at the beginning and ending of flights, thereby letting the main vertical tail be smaller. The challenge will be in efficiently and reliably moving the airfoils in a compact and lightweight design

Flexible Antennas

Drones flying in the National Airspace System are required to stay within the radio line of sight of its ground-based pilot operator. That is usually less than 100 miles. Relaying communications through satellites is one potential solution but it takes a large, heavy antenna to transmit and receive data through a satellite. Large, bulky antennas could protrude from the aerodynamic fuselage and add weight and drag, as well as consume more fuel.

NAS will work on developing a conformable antenna based made partly from thin, lightweight sheets of aerogel. One goal of the new antenna is that it be able to transmit signals in specific directions, assuring strong links with satellites while minimizing interference with the ground when the aircraft flies low.

I wish NASA well on these projects and hope the results can be commercialized throughout commercial and general aviation, as well as the defense department. Are there any aerospace projects you think NASA should be concentrating on? Unmanned airliners? A manned space station in permanent orbit? Or maybe just more legroom as standard fare in all seats on commercial flights?



Discuss this Blog Entry 8

on Aug 31, 2016

As long as the air transportation industry is driven almost completely by profit I don't see hope for more leg room.

on Aug 31, 2016

Seems like the ROI for wingtip yaw control would be minimal, plus this interferes with and/or removes winglets which were added to reduce tip vortices/improve fuel economy. Further, the existing vertical stabilizer/rudder are in a prime mechanical advantage position for rudder power. Perhaps the research should focus on the rudder design itself...maybe something along the lines of Fowler flaps to increase rudder power as needed and thus reduce drag during cruise. But then, what is one man's opinion vs. NASA?

on Aug 31, 2016

I worked at Hughes with nasa and the aviation industry through the Air transport Association and through Arinc in the 1970's

Pan Am took delivery of the first 747 and it was equipped for Satellite communications using a flush mounted VHF antenna- it worked well with our Nasa-Hughes Advanced technology Satellites on both the atlantic and pacific routes. Pan AM could talk to these aircraft in flight whenever Nasa made time available

on Sep 3, 2016

I think a much larger Pegasus type orbital launch vehicle could be designed using a specially built heavy lift aircraft, remotely piloted to avoid endangering a flight crew. A manned chase plane could place human observers close enough.
The launch vehicle could be designed for re-entry and mid air retrieval by means of a second automated aircraft. It would thus need no landing gear and could be retrieved anywhere weather permitted. The re-entry vehicle and the retrieval aircraft, linked by high speed data communications, would comprise a single automated system able to achieve a linkup much faster than pilots can accomplish mid-air refueling today.

on Sep 4, 2016

Why not just design a retractable rudder ... The weight of the extend retract mechanism might be the deal breaker.

I am sure minds much better than mine would have considered this already.

on Sep 6, 2016

NASA has become a pitiful, bloated shell of the organization that put a man on the moon. These cheesy, low value added projects are proof positive. Perhaps it is time to terminate the agency and give half of its budget to Elon Musk. The only directive would be to get us back to manned space exploration where we would expect to be nearly 50 years after the first moon landing!

on Sep 17, 2016

NASA and other aerospace engineers have doing really a good research

on Dec 15, 2016

"NASA researchers will investigate the feasibility of designing novel, ultra-stable electrolytes that resistant decomposition and the batteries last longer, letting electric aircraft fly farther." are resistant to or resists.

As for funding Elon Musk and his companies, thaey are being contracted to carry goods aneven humans to the space station. Boeing is as well. The human passengers have been postponed until 2018, especially after the rocket explosion earlier this year. No one wants a repeat of many years ago when we lost three astronauts on the launching pad.(must have been 65 or 66. It will be bvetter when the private companies are doing it instead of Government--maybe under government contract, but not directly, possibly the same goes for innovation.

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A questioning, sometimes humorous look at technologies, engineering, and the world.


Stephen Mraz

Steve serves as Senior Editor of Machine Design.  He has 23 years of service and has a B.S. Biomedical Engineering from CWRU. Steve was a E-2C Hawkeye Naval Flight Officer in the U.S. Navy. He...
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