Sh-Boom (oz11825)

About this Plan

Sh-Boom. Control line stunt model for 2.5 - 3.5 cc motors.

Quote: "SH-BOOM. A high-performance easy to build stunt model designed for motors of 2.5 to 3.5 cc. By D Toole.

THE modern stunt model is far removed from the early 'Box Car' designs, and with Sh-Boom the designer has presented an easy to build, good looking stunt model, that lives up to the traditions for performance established by the West Essex Club, of which D Toole is a member.

Fuselage: Shape the sides from 1/4 in sheet and cut out the section for the wing; then cut out the formers. Take the engine bearers and cement them to F2 and F3 which are of 1/8 ply. When dry, cement to one fuselage side, install fuel tank, and slide the wing into position. Next cement F2 and F3 onto the other fuselage side and after cutting out the tank vent holes add F4A, F4B, F5 and F6. Now cement the wing into position. Add upper and lower f in. sheet to the fuselage and leave to dry, then carve and sand to the correct section.

The cowling is constructed from scrap sheet and block, carved away to suit the engine used and faired into a i 4 in. spinner (after engine is installed).

Wing: Start by cutting out 12 ribs from 3/32 in sheet and two from 1/8 sheet. Next pin to the plan the ready shaped LE and TE, also the lower 1/4 sq spar. Add ribs and top spar, also 1/8 sheet tips. Next install the bellcrank complete with lead-outs and push rod and cover the centre section with 1/16 balsa.

Tailplane and Fin: These are constructed from fairly hard 1/8 sheet. Sand to section and add elevator hinges and horn to tail-plane, then connect the horn to push rod and cement tailplane to fuselage. Cement fin to top of fuselage and add the 1/16 wing trailing edge fairings.

Finishing and Covering: Sand the whole model with fine sandpaper. Cover the fuselage and fin with lightweight Modelspan, giving them one or two coats of clear dope. Then sand lightly and add one or two coats of colour dope. When dry, cement the cockpit cover in place. The wings are covered with heavyweight Modelspan and given two or three coats of glider dope. Finally colour as required.

Although no U/C is shown on the plan, one can be fitted for competition; either by fixing to the engine bearers or by installing an U/C box between F3 and the LE of the wing, raking the wheels forward to about 3 inches in front of the CG.

Flying: Lines between 55 and 60 ft can be used according to the engine; the best props being either 8 x 6 for 2.5 cc, or 9 x 6 for 3.5 cc. The model is very smooth to fly due to the long nose."

Direct submission to Outerzone.

Update 19/12/2021: Replaced this plan with a cleaned up version, essentially redrawn from scratch, thanks to TonyP.

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