Patent GB-472547-A (GB)
Title: Improvements in and relating to aircraft with autorotative wings
IPC: B64C27/02
Filed: 1936-03-24
Abstract: 472,547. Aircraft with rotary - wing systems. CIERVA AUTOGIRO CO., Ltd. March 24, 1936, No. 8762. Convention date, April 2, 1935. [Class 4] In an aircraft having a sustaining rotor, an engine, non-lifting propelling means and a wheeled undercarriage, transmission means are provided, for connecting the engine to the propelling means and to a wheel of the undercarriage, reduction gear being included at least in the wheel drive ; the means prevent simultaneous driving of both the wheel and the propelling means or provide for steering the wheel. In one form, the aircraft is provided with stabilizing surfaces 10, 11, 12 and a rudder 13. The undercarriage comprises cushion wheel 14 mounted on shock-absorbers housed within fairings 16 and a cushion tail wheel 17 orientable concurrently with the rudder 13 by operation of pedals 24. Coaxial airscrews 25, 26 are supported in bearings and driven through gearing housed in the casing 27. The aircraft is sustained and controlled by a rotor which includes blades set so as to auto-rotate under the influence of relative airflow and connected to hub 32 by flapping and drag pivots 29, 31 respectively. The rotor is tilted for longitudinal control by fore-and-aft movement of a lever 39 and for lateral control by lateral movement of the lever. Rotation of the rotor is initiated through mechanism including a shaft 44, a reduction gear, and an overrunning clutch. The rotor is folded during road transport and is held over the tail by a strap. The engine 45 is housed in a heat and sound insulated compartment 46 provided with screened air-inlet scoops 48 and with screened air-outlet louvres 50. The engine axis is inclined upwardly and forwardly by means of a tubular engine mount 51, 52. The airscrews are driven through gears 79, 80, 88, 89 shafts 69, 75 and gears 74, 70 which mesh with opposite sides of one or more pinions 71, 73. The pinion 73 is driven through the pinion 70 which is axially displaceable, by means of a forked lever 99, on the engine shaft 65. The shaft 44 is driven through bevel gears 95, 96 and a manually operated clutch 97. A fan 109 having a weighted rim 110 is provided. The rear wheel 17 is driven through a dogclutch 66a, a multi-plate clutch and brake 115, universal joints 117 and slip joint 118, shafts 104a, 104b, 104c and bevel gearing. The lever 99 and a lever 107 for operating the dog clutch are connected to a hand lever 103 for simultaneous operation so that the engine is connected either with the airscrews or with the rear wheel but not with both. The plate clutch and brake are operated through the lever 139 such that forward movement of the lever engages the clutch whilst rearward movement operates the brake. The wheel 17 is mounted in a fork 148 resiliently mounted in a cylinder 18a fixed in the fuselage. A shaft 154 is journalled in the sleeve, is rigidly attached to the fork and is provided with arms 155, moving in guides 155a and a slot in the shaft to facilitate orientation of the wheel and to accommodation deflection under road shock, respectively. A sleeve 18 carries arms 156 in which the driving shaft is journalled. The drive is led through bevel wheels 159, gear wheels 161, 162 and a bevel reduction gear 164, 165. The cabin is provided with doors 166 giving access to side-by-side seats 169. A fuel tank 146 is located above the engine for gravity feed. The airscrew thrust line passes close to or intersects a horizontal transverse axis passing through the centre of gravity g and the rotor lift line, on the average, passes close to and preferably slightly behind this axis. One airscrew only may be employed and torque reaction may be counteracted as described in Specification 413,069, further the airs crews may be laterally displaced. In a modification, the gear box 93 is omitted and a fan is permanently mounted direct on the crank-shaft and co-operates with an air inlet, baffles and an air outlet. The rotorstarting shaft is driven from bevel gearing adjacent the airserews and the front landing- wheels are provided with brakes operated from pedals adjacent but below the pedals 24. A luggage compartment and a fuel tank are situated beneath the cabin seats.