ABC Robin - scale model, for single channel RC.
Quote: "THE ABC Robin built by ABC Motors around about 1929-30, was a midget single-seater cabin monoplane of just over 25 ft span, and was powered by an ABC 35 hp Scorpion horizontally opposed twin motor.
The construction is very simple and should not prove difficult. It has a simple slab-sided fuselage built up with 3/16 sq spruce or birch longerons with 3/16 sq hard balsa uprights and cross-members, etc. It was found necessary to steam the longerons to obtain the curve from the bottom of the cabin to the nose.
The original flew straight off the board with no additional trim necessary. The glide is quite flat, and under power the model is fast and very responsive to control. It has been found that very little rudder movement is needed for formal flight.
First build the side-frames on the drawing, making sure that all gussets, etc. are fitted, then remove the two sides from the drawing and fit the cross-pieces, starting at the cabin, and working back to the tail and then forward to the nose. (Remember that the top cross-member at the rear of the cabin is 3-ply and extends downward to the centre longeron.)
After building the basic framework, undercarriage and wing strut tubes should be added, followed by the hooks for the receiver, battery box and all wiring. The 1/16 sheet on one side of the cabin should be added at this stage so that the switches, etc. can be fitted. Finally fit the motor bulkhead and the motor, followed by the nose formers, and last by 1/16 sheet covering.
Wings. The wings are quite simple and there should not be any difficulty here. The spars are of 3/16 sq spruce and the ribs of 1/8 balsa, with hard balsa leading and trailing edges. The tubes for the wing struts should be bound with wire to the spars and soldered, as are the wing retaining hooks..."
Update 04/07/2016: article page added, thanks to RFJ.
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