Low-Wing Petrol Monoplane. Free flight power model.
Quote (from plan drawing): "A low wing petrol monoplane for 9 cc engines 'The Gull' by Major CE Bowden. Source: 'Newnes Practical Mechanics' Feb/March 1940. Issue kindly copied for me by Geoff Clarke. Note: These drawings are half size except ribs and fuselage formers."
Note: It seems the use of the title "Gull" on this plan drawing is mistaken. Certainly there was a different low wing power model design by CE Bowden that was called Gull ...and this is not it.
Quote (from article): "A pioneer of model petrol-engined planes in this country is Colonel Bowden, and in view of the fact that so many petrol engines are now available at a reasonable price, I propose to describe the construction of one of his machines. I have obtained the details from Colonel Bowden of one of his low-wing petrol models which is really stable and simple to construct.
Not only is the model stable, but it has been found to be more stable than the average good high-wing model. This is no exaggeration, but is an actual fact. On pages 228 and 231 are shown photographs that give a general idea of the model with its rounded top to the fuselage. They show its keen but simple lines combined with general dihedral angle of the wings.
The model has a wing span of 8 ft and maximum chord of 16 in, length 5 ft 3 in, and a weight of 6-3/4 lb. It has been flown frequently with a 9 cc Brown, and also with a 9 cc Ohlsson engine, on from 1/2 to 3/4 maximum revs. The photograph on page 231 shows the model in flight, and also gives a good idea of its flat gliding angle.
The Fuselage. Figs 251 and 252 on pages 229 and 230 represent a plan and side elevation of the model. A scaled-up full-size drawing should be made upon cheap drawing-paper, unless the builder wishes to keep his plans, when a better but thin paper should be used. It is necessary to draw up the fuselage full-size, side elevation and plan, on one piece of paper.
From this and Fig. 255, dimensions of the five 3-ply formers can be obtained, and the formers cut from 1/8 in 3-ply, except No. 1 nose-piece former, which is cut from 1/4 in 3-ply. All formers are fretted out for lightness, and these formers make jigs to keep the fuselage true whilst building.
As the tops of the formers are measured from a straight top line from the fuselage, if the formers are accurately cut and the fuselage sides correctly shaped the correct angle of incidence of the low-wing will be automatically obtained. The formers also take the shocks, and stubs of detachable wings and tail-retaining hooks, engine, and undercarriage.
Wire hooks, as shown, are bound with thread and glued to the formers. Hooks should be of 16 swg wire (see Fig. 255). The two sides of the fuselage are cut from 1/16 in sheet balsa of light weight to the side elevation shape of the fuselage..."
Scan from DBHL, cleanup by theshadow.
Direct submission to Outerzone.
Update 06/05/2018: Added article pages (chapter XXV from the Newnes 1949 "Model Airplane Handbook") thanks to Pit.
Article, includes pics and drawings.
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