Whisper Aero emerges from stealth to quiet drones and air taxis

Published July 13, 2021

The skies are on the cusp of getting busier — and louder — as drone delivery and electric vertical take-off and landing passenger aircraft startups move from moonshot to commercialization. One former NASA engineer and ex-director of Uber’s air taxi division is developing tech to ensure that more air traffic doesn’t equal more noise.

Mark Moore, who was most recently director of engineering at Uber Elevate until its acquisition by Joby Aviation, has a launched his own company called Whisper Aero. The startup, which came out of stealth this week, is aiming to designing an electric thruster it says will blend noise emitted from delivery drones and eVTOLs alike into background levels, making them nearly imperceptible to the human ear.

It’s a formidable challenge. Solving the noise problem comes down to more than simply cranking down the volume. Noise profiles are also characterized by other variables, like frequency. For example, helicopters have a main rotor and tail rotor that generate two separate frequencies, which makes them much more irritating to the human ear than if they were at a single frequency, Moore told TechCrunch in a recent interview.

Complicating the picture even further is that eVTOL companies are designing entirely new types of aircraft, ones that may generate different acoustic profiles than other rotorcraft (like helicopters). The U.S. Army recently undertook a research study confirming that eVTOL rotors generate more of a type of noise referred to as broadband, rather than tonal noise which is generated by helicopters. And as each eVTOL company is developing its own design, not all of the electric aircraft will generate the same level or kind of noise.

Whisper is designing its scalable product to be adoptable across the board.

Moore said the idea for the company had been fomenting for years. He and Whisper COO Ian Villa, who headed strategy and simulation at Elevate, realized years ago that noise (that is, less of it) was key to air taxis taking off.

“The thing that was abundantly clear was, noise matters most,” Villa said. “It is the hardest barrier to break through. And not enough of these developers were spending the time, the resources, the mindshare to really unlock that.”

Whisper CEO Mark Moore. Image Credits: Whisper Aero (opens in a new window)

Helicopters have mostly been able to get away with their terrible noise profile because they are used so infrequently. But eVTOL companies like Joby Aviation are envisioning far higher ride volumes. Moore is quick to point out that companies like Joby (which purchased Elevate at the end of 2020) are already developing aircraft that are many times quieter than helicopter, and are “a step in the right direction.”

“The question is, ‘is it enough of a step to get to significant adoption?’ And that’s what we’re focused on.”

Whisper is staying mum on the details of its thruster design. It has managed to attract around $7.5 million investment from firms like Lux Capital, Menlo Ventures, Kindred Ventures and Robert Downey Jr.’s FootPrint Coalition Ventures. It’s also aiming to convert its provisional patents with the United States Patent and Trademark Office sometime next year.

From there, the startup envisions launching in the small drone market around 2023, before scaling progressively up to air taxis. Moore said the goal is to get the thrusters manufactured and in vehicles by the end of the decade. Should the first generation of eVTOL go to market in 2024 (as Archer Aviation and Joby have proposed), Whisper’s product could potentially appear in second generation eVTOL.

In the meantime, Whisper will continue testing and working out remaining technical challenges – least among which is how to manufacture the end product at a reasonable cost. Whisper is also preparing to conduct dynamic testing in a wind tunnel, in addition to the static tests it has undertaken at its Tennessee headquarters, some in partnership with the U.S. Air Force.

“It’s got to be quiet enough to blend into the background noise,” Moore said. “We know this and that’s the technology we’re developing.”

Archer Aviation aims to launch network of urban air taxis in Los Angeles by 2024

Published February 23, 2021

Archer Aviation, the electric aircraft startup that recently announced a deal to go public via a merger with a blank-check company, plans to launch a network of its urban air taxis in Los Angeles by 2024.

The announcement comes two months after the formation of the Urban Air Mobility Partnership, a one-year initiative between Los Angeles Mayor Eric Garcetti’s office, the Los Angeles Department of Transportation and Urban Movement Labs to develop a plan for how to integrate urban aircraft into existing transportation networks and land use policies. Urban Movement Labs, launched in November 2019, is a public-private partnership involving local government and companies to develop, test and deploy transportation technologies. Urban Movement Labs and the city of Los Angeles are working on the design and access of “vertiports,” where people can go to fly on an “urban air mobility” aircraft. Urban air mobility, or UAM, is industry-speak for a highly automated aircraft that can operate and transport passengers or cargo at lower altitudes within urban and suburban areas.

Archer Aviation’s announcement comes two weeks since it landed United Airlines as a customer and an investor in its bid to become a publicly traded company via a merger with a special purpose acquisition company. Archer Aviation reached an agreement in early February to merge with special purpose acquisition company Atlas Crest Investment Corp., an increasingly common financial path that allows the startup to eschew the once traditional IPO process. The combined company, which will be listed on the New York Stock Exchange with ticker symbol “ACHR,” will have an equity valuation of $3.8 billion.

United Airlines, which has a major hub in Los Angeles, was one of the investors in the deal. Under the terms of its agreement, United placed an order for $1 billion of Archer’s aircraft. United has the option to buy an additional $500 million of aircraft.

“Archer’s commitment to launch their first eVTOL aircraft in one of United’s hubs means our customers are another step closer to reducing their carbon footprint at every stage of their journey, before they even take their seat,” Michael Leskinen, vice president of corporate development and investor relations at United Airlines, said in a statement. “We’re confident that Los Angeles is only the beginning for Archer and we look forward to helping them extend their reach across all of our Hubs.”

Archer lands $1B order from United Airlines and a SPAC deal

Archer has a ways to go before it’s ready to shuttle passengers. The company has yet to mass produce its electric vertical take-off and landing aircraft, which is designed to travel up to 60 miles on a single charge at speeds of 150 miles per hour. The company previously said it plans to unveil its full-scale eVTOL later this year and is aiming to begin volume manufacturing in 2023.

Designing and building a hub of vertiports is among the numerous tasks that must be completed in the next three years. Brett Adcock and Adam Goldstein, the company’s co-founders and co-CEOs, have said they’re open to using existing infrastructure such as helipads and parking garages in the short term. Their eVTOL, known as “Maker,” is built to fit within the size of the existing infrastructure, according to the company. That flexibility, assuming the Urban Air Mobility Partnership agrees with the strategy, could help Archer meet its 2024 deadline.