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Aviation History
1936
1936 - 2420.PDF
SEPTEMBER 3, 1936. FLIGHT. ?55 AN INSTRUCTIVE KIWI The Kronfeld Ground Trainer : Economy for Clubs VERY considerable reduc tions in the time devoted to elementary dual instruc tion are visualised, by Mr. Robert Kronfeld, the designer of the Kronfeld Ground Trainer which emerged from the works of Kronleld, Ltd. a few days ago and went purring across the aero drome with its tail in the air, banking and turning, but always in contact with the Hanworth sward. The object in producing this apparatus was to provide a means whereby a pupil could familiarise himself with the workings and feel of a conventional set of controls in perfect safety and at trifling cost. The prototype has been bought by Mr. Lindsay Everard, M.P., and will be used by the Leicestershire operates a Drone. Arranged as a pusher, the new ground trainer seems suffi ciently sturdy to defy any abuse to which it is likely to be subjected. The pupil is seated in front of what would be, were the machine fitted with wings, the leading edge. He has a special throttle control, the effectiveness of which can be increased with his proficiency, permitting taxi-ing up to about 50 m.p.h. The undercarriage is situated close to the C.G., and from Mr. Kronfeld illustrates how the lateral control of his new ground trainer can be used with impunity. (Flight photograph.; Pou Club, which already 'core" of the Kronfeld ground trainer, showing the installation of, and the feeding arrangements for, the con verted Ford engine. (Flight photograph.) beneath. The undercarriage is of steel tube and has a track of 4ft. bin. Resting on the main axle are tubes which carry the wheels. These are free to move up and down so that by wrapping rubber cord around them a simple shock-absorbir is made. Directly above the undercarriage are two substantial steel tubes in the form of an inverted vee which support the "wings" and engine. The engine mounting takes the form of two rails of one-inch diameter tube welded on to the main vee struts and supported by two more struts bolted to the main boom or fuselage. • A modified Ford engine is used, giving 30 h.p. and driving an airscrew 4ft. in diameter. The control column is mounted on a torque tube which runs back to the front of the main vee struts where a " bloater " is welded on, the cables running upward and over two pulleys out to the ailerons. Each aileron is slipped over a long tube of 3in. diameter which forms the " wing spar." At the front end of the main-torque tube is a pulley for the elevator con trols, one end travelling down to the elevator through the tube. Simple wooden construction with fabric covering is used for the tail units, the tail plane being braced by one-inch stream line tubes. The anti-drag wires for the wing are fixed to the front tail plane attachments, and the drag wires are con nected to the nose wheel fittings. It is possible to fold the "wing" by detaching the drag wires. Mr. Kronfeld is working out a suggested routine to be fol lowed during instruction. First of all he contemplates placing the machine with the axle against a stake, opening the throttle so that the slipstream lifts the tail and permitting the " feel" ot the elevators. Next, instruction would be given in the use of the ailero.is and then slow taxi-ing would be permitted to teach the use of the rudder. After that there would be exer cises in combinations of two controls, and finally the pupil would be permitted to taxi at full throttle with all the con trols in operation. It might be advantageous to mark out S turns on the instructional held for the pupil to follow. The price, with Ford engine, will be £195. it to the becon is stretched a rubber cable. As the pupil confident the tension on the cable is re-ies increasingly eased, making it necessary for him to use his ailerons in order flevat P a W1i"g fr°m droPPin8- Should lie apply too much turnit°r' Th let' '" the n0Se Prevents the niachine from over- simil"" • 1 re are wneels also at the wing tips to prevent contiol aCC through ovef-enthusiastic use of the lateral taperin(TUS« C is a lem?th of spruce measuring 6in. by 2in., back [,„!a tbe fro,1t.and rear. About a third of the way om (lie nos e is the pilot's seat with the undercarriage Egyptians Entertained MEMBERS of the Egyptian Delegation in England for the signing of the Anglo-Egyptian Treaty paid a visit last Friday to Hawkers' flying sheds at Brooklands. They were favoured with good weather—which even they agreed was hot —and spent an interested hour and a half looking over machines in various stages-of erection and an excellent flying demonstration by Mr. P. G. Lucas on the works Fury G-EBSE, which is used mostly for experimental purposes. After the show, lunch was taken at the St. George's Hill Golf Club, which boasts one ot the finest outlooks in southern England. A photogiaph of members of the party appears on page 257.
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