Boom (oz5203)

About this Plan

Boom. J Fleming 35 inch span free flight sport model for .8cc (.049cu.in.) from Aeromodeller February 1959.

Quote: "Gives the jet look for sport flying with .5 to .8 cc engines. Boom, by J Fleming.

You won't break any sound barriers with 'BOOM', but you'll also have a job denting this model because of its solid construction. Designed for .5 to .8 cc engines to be an out-of-the-rut model with jet fighter appearance, it's surprisingly easy to build providing you start by familiarising yourself with the plan.

As usual, cut all parts out and begin the fuselage by pinning two lengths of 3/16 in square balsa onto the plan view. Now fit the engine mount and all upper formers not forgetting the doublers F.4 and F.5 on F.3 and F.6. Cement the 1/8 in hard balsa wing mount onto the doublers and then slide and cement the boom in position. This consists of two sides of 1/16 in sheet balsa with a 1/4 x 3/16 in balsa strip sandwiched at the top and bottom. Note the extra stiffener of balsa near the tail. A 1/16 in ply platform completes the boom. Slide the root ribs onto the wing mounts and then cover the upper fuselage with 1/16 in balsa filling in the space between root ribs and fuselage with scrap balsa.

Bend nose and mainwheel wire to shape and sew to their respective formers. To get the CG in the correct posiiion, plastic wheels are used for the main wheels, with a rubber nosewheel. Now add the lower fuselage formers and plank with 1/16 in balsa. Roll a thin card tube and insert through the fuselage, this will help clear exhaust oil from the engine bay. Engine cowling is formed from scrap or block balsa. Sand the fuselage smooth and covering will be facilitated by doping on rag tissue followed by two coats of dope. Alternatively, apply coats of dope mixed with talcum powder and sand smooth. Fuel proof the engine bay and after bench running the engine to ensure ready starting, install with 1 degree upthrust. Add the cockpit canopy.

Tail assembly is straightforward. The fin is cut from 1/8 in medium sheet with the leading edge butt jointed as shown. The tailplane is also from 1/8 in sheet and consists of three pieces cemented together..."

Direct submission to Outerzone.

Supplementary file notes

Article pages, text and pic, thanks to KeithF.

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