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Aviation History
1948
1948 - 0050.PDF
44 FLIGHT JANUARY STH, 194s SERVO CONTROL Helicopter Stability Achieved in New killer 360 : "Finger-tip " j ' Loads on the Stick YOUNG Stanley Hiller Jun., president of United Heli-coplers Inc., of Palo Alto, California, appears tohave^ achieved an important step forward with his latest type of rotor control, incorporated in the new Hiller 360, which is to go into production for the industrial and agricultural markets. The first public demonstration of the new helicopter was given on December nth, last. Flying just above the ground, Mr. Frank Peterson, the company's chief test pilot, let an assistant on the ground rock the machine, which im- mediately righted itself without the pilot touching the rotor controls, although we imagine that he still kept his feet on the pedals for the tail rotor. When suitably trimmed, the new helicopter can be flown hands-off for quite long The Hiller 360 is a three-seater with unusual features, periods. It is a three-seater with quite a useful disposable load, and giving about the usual helicopter performance in spite of the modest power output of 178 b.h.p. HILLER 360 SPECIFICATION WEIGHTS : Gross (normal) ... ... 2,100 Ifa 1,353 Ib 7471b 5101b 60 1b 162 (b 15 Ib Empty Useful Load Pilot and 2 Passengers (at 170 Ib < Baggage Fuel (27 gallons) Oil (2 gallons) POWER PLANT Type FUSELAGE: Maximum Fuselage Width ., 5ft 3Jin Length (tail rotor vertical) 37ft lOin Height (to top of cabin) ... Sft 8in Height (to top of rotor) ... '•'•- 9ft 7in CABIN DIMENSIONS : Width (at seat) '... , ... ... 63|in Length (seat back to nose) ... ... ... 53iin Height (floor to roof) 49Jin Rated R.P.M - ^ Rated Power Power Loading (normal gross weight)... MAIN ROTOR : * Diameter ... Number of Blades'" R.P.M. (rated) Tip Speed (normal) •R.P.M. Ratio to Engine R.P.M ANTI-TORQUE ROTOR : Diameter Number of Blades R.P.M. (rated) Tip Speed (normal) R.P.M. Ratio to Engine R.P.M Aircooled Motors, Inc. Model 6V4-I78-B32 3,000 178 h.p. 11.8 Ib.h.p. 36ft 6in 2 327 590 f.p.s. 1/9.17 *• 5ft 6in 2 1,875 540 f.p.s. 1/1.6 At- first sight the newHiller control bears a certain resemblance to that of theBell in that there is, in addi- tion to the two-bladed mainrotor, an auxiliary rotor of smaller diameter resemblin/;|somewhat the stabilizer ba£l of the Bell. Although there'is probably a certain stabiliz- ing effect due to the gyro-scopic action, the novel fea- ture of the Hiller is that theblades of the auxiliary rotor carry at their tips aerofoilsurfaces of symmetrical sec- tion. These are in effectservo controls, and the pilot operates them through anoverhead stick. The control rotor is connected to thehanging stick through simple '' scissors '' links. Several advantages accruefrom this arrangement. The The new Hiller control system. The overhead stick operates the servo rotor which, in turn, controls the main rotor. The machine can be flown " hands- off."
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