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Aviation History
1946
1946 - 2076.PDF
420 FLIGHT OCTOBER I7TH, 194" The Morane Sanlnier Another French Private* owner Type : Folding Wings and Tricycle Undercarriage AS readers will have gathered from a recent J-\ article, a healthy future of French •*• -^ aviation is the considerable activity centred around civil aircraft construction— particularly of types in the private-owner or charter flying categories. Several of the new types, too, show refreshing originality, and none more so than the M.S.560, 570 and 571 low-wing monoplanes produced by the Morane- Saulnier concern. These are constructed entirely of metal, have a tricycle undercarriage and folding wings. The M.S.560 is a single-seater and the two-seater 570 is being replaced by the latest in the series—th? two/four-seater M.S. 571. Despite the structural similarity of all three aircraft, the 571 shows a vast improvement on the 570. The appear- ance has been improved by lengthening the undercarriage legs, and by ledesigning the fuselage, tail unit and the sliding canopy, whilst the performance loss is negligible despite a much greater all-up weight. First importance has been given, during design and development, to con- siderations of cost reduction, safety and comfort, yet despite these conservative factors it is a very advanced aircraft in its class. • In the matter of price, Morane-Saulnier are keeping costs down by adopting methods favoured by car manufac- turers—including the extensive use of forgings and cast- ings, pressed sheet-metal sections, electric welding of assem- blies and a moving production line. Interchangeability and simplicity of components and parts, embodied on all French light aircraft because of Ministry direction, are included as a matter ot course. Design has been calculated to give stability and safe rather than lively flying characteristics. Items of- equipment which Morane-Saulnier consider essen- Unusual in modern aircraft, the wings of the 571 are arranged to fold.Since the overall height in the folded condition is likely to be consider- able, however, it is doubtful whether this capacity will be much used by the private owner. tial to secure all-weather operation are a full set of blind- flying instruments and an E/T set for the receipt of the met. information , whether the set will include a trans- mitter is not made clear. Normal accommodation is for a pilot and one passenger in the front side by-side seats, with a second passenger placed in the centre at the rear, with space for baggage at either side Lockers beneath the instrument panel pro- vide additional stowage for a total of 66 lb of baggage. The entire cabin is enclosed by a deep windshield and a very large transparent plastic sliding canopy giving, in con- junction with the high seating position, a good view in all directions. The only canopy stiffeners are light frames which do not interfere with visibility—but the mainten- ance of a cool cabin interior in strong sunlight will prob- ably tax the efficiency of the ventilation system. The single rear seat may be replaced by a larger one seating two children or, with a squeeze, two adults. The rear cabin may be used for mailbag or freight stowage, or the aircraft may be laid out as a two- or three-seat trainer. The fuselage is a duralumin semi-monocoque built in halves and joined along the vertical centre-line, with cut- outs for the certrp-section and canopy. Frames, stringers, the firewall, and the tail reinforcing bulkheads are electric- welded to the skin. The tailplane attaches directly to the .fuselage at four points and carries the all-metal fin. Movable controls, of metal, are balanced aerodynamically and static- ally. The wing, built in three sec- tions to facilitate folding _ comprises a main torsion box formed by the two spars, intermediate ribs, and top and bottom skinning, with detachablef" leading-edge and trailing-edge sections. A good idea of the all-round view provided for the occupants of the 571 is given bythis air photograph. The entire canopy slides back. In general lines, as will be seen, the 571 follows modern convention. I . DATA AND PERFORMANCE j 140 h.p. Renault or Potez L.E.M. | Span... 1 Length i Weight empty (thrce-serter' \ Useful load (three-seater). J All-up weight (three-seater) 1 Maximum speed (1,640ft) ... [ Cruising speed (70 per cent j power) ...1 Stalling speed (flaps down ?t ! 2,3181b) I Absolute ceiling i Range j Fuel 34ft ?in 27ft II in 1,491 Ib I . 8271b ' 2.3181b i 161.5 m.p.L. ! 143 m.p.h. i 50.6 m.p.h. : 19,700ft Over 620 miles. 35 gallons
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