DH9a (oz2819)


DH9a (oz2819) by Eric Fearnley 1954 - plan thumbnail

About this Plan

D.H.9a. Scale CL model biplane. For 1.5-2cc motors. Model Aircraft, February 1954.

Quote: "Presenting a 1917 warplane in the form of a scale control-liner for 1.5 to 2 cc motors. DH9a, by E Fearnley.

The D.H.9a had a US-built Liberty motor with coil ignition, a service ceiling of 16,500 ft, top speed of 114 mph with a 460 lb bomb load. Its appearance in June 1918 left it too late to show its real merit. The 110 (Hyderabad) Squadron were the first to receive them, and in the month or two in France carried out a number of successful raids in formation.

Our model is a faithful reproduction of the real one, suitable for a hot motor of 1.5 cc to 2.5 cc. The Elfin 1.49 used in our model stooges it around at a reasonable speed in keeping with its type; however those who want stuntability will prefer the 2.49. In the latter case, alteration of the motor mounts will be necessary.

Start the fuselage by cutting out the quarter sheet nose sides as indicated. Cement to these the motor bearers. While drying, cut out the formers, and fuselage sides. Fit the quarter sides to the formers indicated, and when dry, add the sides to this assembly, and when dry, the rest of the formers. If the wood is chosen carefully, the fuselage will be in line. If there is any distortion, now is the time to steam this true.

Fit the control arm and lead out wires, and the tail push rod. Leave the end sticking out of the rear hole for the time being. Add the undercarriage fittings of hardwood with the wire vees bound to these, and the plywood radiator at the nose, with the sheet undersurface of the nose, leaving a fuel drain slot at the rear. Fit a team race tank where shown, and add filler and lead out pipes.

With the addition of the tail skid block the fuselage is now ready for sheeting up as shown. Do not sheet bottom yet, though. The cockpits are cut out afterwards, and details added. Dope on tissue all over, and sand and add filler sanding until a satin finish results.

The wings are almost identical. Construction is almost too simple. Use substantial wood for these, however, as a line job has to take quite a bit of knocking about. The tail is of sheet and no difficulty should be experienced here. A one eighth dowel runs across the elevators to operate both sides in unison. The tail fin is offset to keep the nose out in flight..."

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DH9a (oz2819) by Eric Fearnley 1954 - model pic


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