Spad 20 C2 (oz14454)

About this Plan

Spad 20 C2. Radio control scale model biplane for control line. Wingspan 1100 mm.

Direct submission to Outerzone.

Quote: "Hello Mary: Voici le plan encarté du Spad 20 C2 - Herbemont dans la revue Modèle Réduit d'Avion nº 440 de juillet 1976. Amitiés, Maurice DC"

Planfile includes article.

Quote (google-translated from the French): "The plan of the insert by Michel Pottin. LE SPAD 20 c 2 - HERBEMONT. Two-seater fighter. 1/10 scale RC flying model for 2.5cc to 3.5cc engine.

The SPAD 20 designed by Herbemont was released in August 1918. Fighter pilots were often shot down when attacked from behind; the SPAD 20 was therefore a two-seater fighter armed with 2 fixed Vickers machine guns on the hood (1000 cartridges) and a Lewis light machine gun in the rear seat.

Note the great visibility of the aircraft, the lower wing in one piece, a simplified guying and the monocoque fuselage made up of three layers of plywood with crossed blades.

A series of 200 per month had been ordered as early as August 1918. After the war, transformed for the transport of three passengers, it was assigned to the Paris-London and Paris-Brussels lines. In 1919, Sadi Lecointe broke the world altitude record with 8,900 meters, the speed record with passenger at 230 km/h and won the Deutsch Cup.

Construction: In order to make the insert as clear as possible (something difficult to obtain with devices of this size) I have limited the writing to a minimum. You will therefore find in this article the details necessary for the construction of the model. A page from the magazine and a 3-view plan complete this description.

Fuselage:The monocoque fuselage is made up of 12 couples. It will be built in one or two parts. A block of hard balsa forms the nose of the fuselage up to couple C1 in balsa 30/10e. The couple C2, receiving the motor is in CTP 5 mm, pairs C3 and C4 are in CTP 30/10.

The other couples are in balsa 30/10. Between the C1 and C3 couples there will be a floor in CTP 20/10 on which will be fixed the landing gear. The couples are joined together by 4 hardwood beams: 2 of 10 x 3 above and below and 2 of 6 x 3 on the sides. The whole is covered with 10/10 balsa slats and sanded.

The front top of the fuselage is made up of a balsa block between C1 and C3 in which the stays are fixed. The lower wing is fixed under the fuselage, and a block integral with the wing connects the shapes.

Wings: The top wing is built integral with the front block of the fuselage by means of struts, which can be in Dural covered with balsa and profiled, or in CTP 30/10e. The classic construction emerges from the 3-view plan. Ribs in balsa 20/10e; 6 hardwood spars 3 x 3: leading edge in 5 x 5 and trailing edge cut in a balsa board of 30/10th.

The lower wing is of identical construction. If ailerons are used, they will be fixed on the lower wing because of the servo. The wings are covered with silk. The 2 mid-wing stays must be removable. They will be made of openwork Dural covered with balsa and profiled.

Empennage: It has a biconvex profile. It is built like a wing with 5 20/10th balsa ribs plus a 30/10th half rib glued diagonally to the fuselage. The elevator can be cut from a board..."

Supplementary file notes

Planfile includes article.

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