Kaufmann No. 3 / No. 4
L.Opdyke French Aeroplanes Before the Great War (Schiffer)
Deleted by request of (c)Schiffer Publishing
Flight, January 6, 1912.
PARIS AERO SHOW.
THE Kauffmann monoplane, while in its broad outline it has much in common with the general run of monoplanes, is chiefly remarkable for the size and shape of its wings. These are arched and turned up at the tips and are only a matter of 2 ft. in chord measurement.
The method of staying them is also interesting.
Four-stranded steel cables, two to each wing, take the weight of the machine in flight, and at a suitable distance from the wing these cables split up into a number of smaller wires, each of which is attached to its corresponding rib in the wing structure. By this system, although the head-resistance of the machine as a whole is increased, a great measure of security is obtained; in fact the constructors claim a safety factor of 25.
The main body is of the ordinary box-girder type, cross-braced with steel wire, and covered in in the front with aluminium sheeting and to the rear with fabric. A 50-60-h.p. radial Anzani motor, direct coupled to a Centrale propeller, is installed at the forward end of the fuselage. The tail is triangular in plan form, and does some of the share of the lifting. Hinged to it is the elevator, and the whole is protected from ground contact by a large flexible skid of malacca cane.
Warping is employed for lateral balance, this being operated, together with the elevating surface, from a central lever in the pilot's cockpit.
Principal dimensions, &c. : -
Length 24 ft. 8 ins. Weight 572 lbs.
Span 35 ft. Speed 85 m.p.h.
Area 154 sq. ft. Engine 50-60-h.p. Anzani.