Eric Walker placed Military helicopters under Helicopters

Eric Walker changed the title of Reddit - Dive into anything to "Heavy Lift"

Eric Walker added Reddit - Dive into anything to Helicopters

Eric Walker placed Igor Sikorsky and helicopters under Helicopters

Eric Walker added 81 years ago, Igor Sikorsky demonstrated his helicopter invention to the public. : interestingasfuck to Helicopters

Eric Walker added Helicopter flight controls - Wikipedia to Helicopters

Eric Walker added Simulation of rotor blade CFD/CSD coupling : EngineeringPorn to Helicopters

Eric Walker added An animation of how the movement mechanism of the helicopter blades works and showing its constituent details : EngineeringPorn to Helicopters

Eric Walker added a number of links to Helicopters, and added Helicopters to Aircraft

Eric Walker added a number of topics and a number of links to Aircraft, and added Aircraft to Aviation and aeronautics and Devices, machines, vehicles and robots