In order to fly a number of single rotor units join up with one another to form a viable aircraft. Individually the units are unable to fly but this changes when they join up and co-operate in order to fulfill their mission.
More details - and videos - can be found here.
UK startup Wild Hydrogen promises carbon negative H2
They expect you to state you have read and accept their membership terms without anywhere they can be read. There are no contact details or any...