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A NEW model of Senor de la Cierva's autogiro, incorporating a radical alteration in the method of control, was demonstrated by the inventor at the London Airport, Hanworth, on April 27. The

autogiro derives its lift from a number of blades rotating in a horizontal plane, instead of fixed wings as in a normal aeroplane. Thus there is relative motion between the blades and the

air, with consequent lift, even when the machine has little or no forward speed. The autogiro can therefore fly with little speed relative to the earth, and can land and take off almost

vertically. Hitherto, the orientation of the machine when airborne has been governed by the orthodox aeroplane aileron, elevator and rudder for lateral, horizontal, and directional control

respectively. This new model, Type C.30, replaces all of these controls by altering the direction of the resultant lift of the rotors by tilting their supporting pillar. A lever attached to

this column is pulled back to make the nose rise, forward to drop, sideways to turn and bank correctly at the same time. Thus the pilot's task in the air is considerably simplified, although

apparently at the expense of a certain amount of rapidity in manœuvrability. Another advantage of this new control is that its effectiveness is a function of the speed of the rotating

blades, and not of the forward speed of the machine as in the normal aircraft. It is therefore equally effective at low flying speeds, a particularly important point in landing, taking off,

and flying near the ground generally. The absence of the usual control surfaces and their supporting parts should give a considerable saving in both weight and head resistance, and should

simplify construction. A fixed tail plane and a vertical fin are still retained for stability, and a tail wheel controlled by an orthodox rudder bar is used for turning on the ground.

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