The way to fly is to go straight up . . . Such a machine (the helicopter) will never compete with the aeroplane, though it will have specialized uses, and in these it will surpass the aeroplane. The fact that you can land at your front door is the reason you can't carry heavy loads efficiently.

The way to fly is to go straight up . . . Such a machine (the helicopter) will never compete with the aeroplane, though it will have specialized uses, and in these it will surpass the aeroplane. The fact that you can land at your front door is the reason you can't carry heavy loads efficiently.