Miss Farnboro (oz867)
About this Plan
Miss Farnboro. Free flight gas model. Super Tigre 7 cc motor.
Quote: "The original model made its maiden flight the night before the 1945 'Hamley.' At this time it was being flown with a 4.5 cc engine, which was changed later an in the season for a Super Tiger 7 cc engine. Fitted with a 4.5 cc engine, the take-off run on full power in still air is 15 feet, followed by a steady climbing circle to the left (150 feet diameter). The glide is what you make it - for contests such as the Bowden we must make sure of the take-off, which means the use of more power than is really wanted, causing the model, once airborne, to gain considerable altitude, and in order to bring it down again within the stipulated time it is best to fly the model under-elevated.
With the larger engine the performance can be spectacular. I see no reason why a 9 cc engine should not be fitted, there is plenty of stability and strength. On one occasion Miss Farnboro glided into a high tension cable, then dropped to the ground some 40 feet below - the only damage sustained was a broken wing-joining dowel and a bent engine bearer plate. Unfortunately the latter was not noticed until the model was flown in the 1945 Bowden Competition - yes, there's a moral in that!
Spend an evening by the fire browsing over the plans: it won't be wasted. Although I hate doing it, I find for convenience it is best to cut out the various portions of a large drawing so that they may be pinned direct onto a reasonable size building board.
Fuselage. Pin down the fuselage drawing onto your board. Now select four lengths of 1/4 x 1/4 in balsa of even quality and bendability; the design allows for the use of medium grade if you have no hard balsa. To prevent the structure sticking to the drawing obtain a cake of soap and rub over all joints with it. Now lay the top and bottom longerons on this drawing and set in position with joiner's pins. Cut the vertical struts off to dead size and cement in place, then fit in the diagonals. Fit in a temporary strut between the tail and extremities.
When the cement has hardened, remove the job carefully from the board and proceed with the other side; while this is setting, cut out formers Nos, 1, 3 and 9, also the tail block. The fuselage sides are next mounted onto formers Nos. 1 and 3 - use plenty of cement and stretch rubber bands over to pull the sides well in place while drying; pull the tail ends together and fit in former No. 9 and again use rubber bands to assist.
Next, check formers for squareness on plan view and proceed to fit cross struts top and bottom, followed by the diagonals. Remove temporary struts and fit tail block. Shape up the engine bearers to the dimensions given and fit them into position; use bags of cement for this job, applying successive thin coats, allowing each coat to harden off. The bearers should be checked for alignment with two straight edges laid across them. Now cement on the 1/8 in sheet balsa to the underside of the bearers at bay No. 2. Fill in sides and bottom of bay No. 1 with 1/4 in sheet balsa..."
Update 12/11/2018: Added article, thanks to RFJ.
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