Bouncing Bertie (oz11954)
About this Plan
Bouncing Bertie. Control line sport triplane model. Torp 29 shown.
Quote: "How many times have you said to yourself, while out at the field - Nothing new around here, same old stuff? Well, we designed Bouncing Bertie for the purpose of presenting something different, and we believe we've succeeded.
The model is designed around engines for .29 to .35 displacement. With slight structural changes engines of greater dis-placement may well be substi-tuted. Construction throughout stresses strength, and therefore you have a beefy, rugged model. The two upper wings are set at one degree incidence, with the lower wing set at .zero. It was noted that the incidence in both wings permitted a shorter take-off run and greater stalling angle.
Construction begins with the sheet balsa fuselage. Select two pieces of even-grained, medium-quality 1/8 x 3 in sheet balsa. Cut the fuselage sides to required contour. Hardwood mounts, 3/8 x 5/8 are then added as shown. You will notice the mounts are recessed to place the engine on proper fuselage center line. Formers A, B, C, and D are next added. The firewall former A is cut from 1/8 plywood. However, before cementing former A in position, slit the forward portion of the fuselage and insert the aluminum landing gear. The gear is made from .040 24 S-T aluminum alloy sheet. Former A can then be cemented in place.
The gear reinforcement is next to be added. A square of 1/4 in hard sheet balsa is cemented between the fuselage, above the gear as shown. Plywood 1/16 thick is then cemented above the 1/4 in sheet. When completely dried, the gear is secured in place with four nuts and bolts. The 3 in bell-crank is fastened to a 1/4 x 1 inch hard balsa platform. Before setting the fuselage aside make the necessary wing cut-outs..."
Direct submission to Outerzone.
Update 15/02/2020: Added article, thanks to RFJ.
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