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Aviation History
1929
1929 - 0293.PDF
FEBRUARY 14, 1929 THE MAUBOUSSIN P.M.4 A French Single-Seater Light Monoplane with A.B.C. " Scorpion " Engine THE " Motor Cycle of the Air " has not yet materialised in this country, although FLIGHT has good cause to know that the type is keenly awaited by a large number of enthusiasts who, having learnt to fly, are not able to afford the present- day type of two-seater, but who would welcome a cheaper machine, even if this should mean flying solo. We are aware that several machines of the single-seater low-power type are coming along, but so far none is available. Without wishing to suggest that we should copy foreign designers, partly for last year's international light 'plane competition at Orly, and partly to test certain theories of the designer's, who has in contemplation a larger machine of which this may be regarded in some way as a large flying model. The P.M. 4 was not, however, finished in time to take part in the Orly meeting, but it has now been completed and is under- going tests by the French Section Technique. The P.M.4 is a high-wing monoplane, with the pilot enclosed in a small cabin provided with windscreen and side The Mauboussin P.M.4 Mono- plane: Side View. Note the very short fuselage. we think it is of interest to note what other countries are doing, and consequently we are publishing this week general arrangement drawings, photographs and descriptive notes dealing with a machine produced in France, and fitted with a British engine, the A.B.C. " Scorpion." The " P.M. 4 " monoplane, which forms the subject of these notes, was designed by M. Pierre Mauboussin and built by M. Louis Peyret, whose tandem monoplane glider won the Daily Mail glider competition at Itford some years ago, piloted by M. Maneyrol. Actually, the P.M. 4 was designed windows. To British eyes the most unusual feature of the design is the extremely short fuselage. The distance from the trailing edge of the wing to the leading edge of the tail plane is less than one chord length (i.e., of maximum chord), and one would expect such a short machine to be rather "tricky" on the controls. The wing section employed-is seen to have a reverse curvature, and the travel of the centre of pressure may therefore be assumed to be restricted, if the c.p. is not actually stationary. For counteracting yawing the short lever arm of the rudder would appear to FRONT AND REAR VIEWS OF THE MAUBOUSSIN P.M.4 : This little French single-seater monoplane is fitted with an A.B.C. " Scorpion " engine. 113
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