Could the ‘flying piano’ help transform air cargo?

US start-up Aerolane is seeking the secret to airborne surfing.

Geese already know how to do it. When you see them flying in a v-formation, they are surfing on the air currents created by formation members ahead and around them.

At an airfield in Texas, Todd Graetz is hoping to use that concept to disrupt the market for air cargo.

Aerolane has been mimicking the tricks used by migrating birds, aided by modified planes towed into the air by another aircraft.

Smoke released from the leading plane allowed cameras installed in the towed aircraft to capture vortices in the air that a glider can exploit to stay aloft.

Their latest test aircraft is known as the “flying piano” because of its poor gliding characteristics.

Its twin engines idle for electrical power while it glides along with propellers turning for purely aerodynamic purposes.

Other tests have measured the tension in the towing line.

They spotted when the line went slack, indicating the glider is surfing along on currents generated by the aircraft ahead.

Aerolane’s plan is to feed all this data into a program that will guide an unmanned cargo plane through wakes and turbulence to exploit the possibilities of gliding long distances without burning fuel.

One or more such cargo planes could be towed by a jet, also carrying cargo, to their destination where they would land autonomously.

The only fuel costs would come from supplying the towing aircraft’s engines.

In theory this should work like a truck pulling a trailer, with air currents doing much of the heavy lifting. This is what Mr Graetz calls “a combination of gliding and surfing”.

The same idea occurred to Airbus, which tested the technique in 2021 with two A350 airliners flying 3km (1.9 miles) apart across the Atlantic.

Although the aircraft were not connected by a tow line, the experiment saw one aircraft winning an uplift from the lead A350’s wake to reduce CO2 emissions and fuel burn.

Mr Graetz, a pilot with 12 years’ experience, founded Aerolane with Gur Kimchi, a veteran of Amazon’s drone delivery project, on the basis that “there has got to be a better way to get more out of existing aircraft”.

The project has raised eyebrows among experienced pilots. Flying large gliders in commercial airspace means meeting strict flight safety regulations.

For instance, the towing aircraft has to be confident it can release the tow line at any point in the flight, safe in the knowledge that the auto-piloted glider can make it down to a runway without dropping on top of the local population.

Aerolane says a small electric motor driving a propeller will act as a safety net on their cargo gliders, giving them enough juice to go around again if a landing looks wrong or to divert to another location close by.

Mr Graetz counters that Aerolane employs active commercial pilots who are…