Eric Walker removed Climate change, atmospheric temperature and helicopters from Climate change and atmospheric temperature

Eric Walker placed Climate change, atmospheric temperature and helicopters under Climate change, atmospheric temperature and aviation

Eric Walker placed Climate change, atmospheric temperature and helicopters under Helicopters

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