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Aviation History
1929
1929-1 - 0196.PDF
FLIGHT, JULY II, 1929 The tail skid of the Parnall " Elf " is a laminated steel spring with replaceable cast-iron shoe. (" FLIGHT " Sketch.) the estimated performance :—Full speed at ground level, 116 m.p.h. ; at 5,000 ft., 112 m.p.h. ; cruising speed, 103 m.p.h. ; stalling speed, 40 m.p.h. The ground rate of climb is 800 ft./min., and the ceiling 16,000 ft. The range is approximately 400 miles. If desired the Parnall " Elf" can be fitted with a twin- float undercarriage, when it should be a very useful sea- plane. The Parnall " Peto" is a two-seater reconnaissance biplane designed for service use in conjunction with sub- marines. It is of composite construction, the metal work being chiefly stainless steel or duralumin. The limitations on space for stowage on board a submarine called for con siderable ingenuity in design to meet service requirements Attachment of wood ribs to'torque tube in " Elf " ailerons. (" FLIGHT " Sketch.) and at the same time produce an aircraft that was sea-worthy and had a useful air performance. The " Peto " can be launched from or stowed in its base in an exceedinglyshort time. Provision is made for catapult starting. The fuselage is of rectangular form, with spruce longerons and spruce or stainless steel struts. The rounded deck A hinged lever, normally folded flat against the spar, holds the folded " Elf " wing in place against the fuse- lage. (" FLIGHT " Sketch.) Side elevation of "Peto" with wings folded. fairing meets the underside of the centre-section. The fuselage is fabric covered except the sides of the front cockpit, where quickly-detachable aluminium panels are used. The biplane wings have spars and ribs of spruce, while the centre section and aileron spars are steel tubes. The top planes have ailerons extending the whole span, while the lower plane trailing edge is hinged for wing-folding purposes. A braced monoplane type of tail is used, of composite construction and fabric covered. The fin is underslung, the rear spar to which the rudder is hinged being attached to the top and bottom longerons. The tail plane has provision for trimming during flight. Of the twin-float type, the undercarriage has streamline struts of N-formation in side elevation, braced with cables in front and rear panels. Long single-step duralumin floats are I PARNALL PETO. Bristol "Lucifer" Engine. 623
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