338,515. Gray, W. E. Aug. 19, 1929. Land wheels.-An aeroplane undercarriage comprises two sets of wheels, one set well ahead of the centre of gravity and the other sufficiently far to the rear thereof to ensure that the rear of the machine can never rest on the ground, one at least of the sets of wheels being steerable and at least one being provided with brakes. Elevators which may be the usual elevators of the machine, are provided at the rear and are of sufficient size to lift the front set of wheels off the ground for taking off. A tail skid may be provided. Specification 289,109 is referred to.