About this Plan
Firefly. Stunt model for CL. Frank Warburton's Fairey Firefly semi-scale stunt model. Suitable for 5 - 8cc engines.
Quote: "Firefly by Frank Warburton. The Firefly is a perfectly orthodox stunt model as far as layout and construction are concerned, yet it has many realistic features, plus ample scope for constructional detail, to help in gaining high appearance points in competitions. Even more important it is very steady and positive on the lines and makes an ideal all weather stunter. The original is a little on the heavy side at 50 oz, but with 610 sq in of wing area, it handles very 'lightly' with a Merco 35.
Construction. Cut all the wing ribs from soft 1/16 in balsa by the sandwich method, ie cut 1/8 in ply templates of R1; R10; and R21 and then sandwich ten balsa blanks between R1 and R10 and bolt together. Carve and sand to aerofoil section, mark the position of the main spar slots, then separate the ribs and cut out the 1/2 x 1/8 in spar slots individually. Repeat for starboard wing ribs, sandwiching blanks between R..10 and R.21 templates, but remember to place only nine blanks between the templates. Cut the ribs R.11 and R.12 from 1/8 in balsa and cut lead out holes in all ribs to save weight.
Slide the ribs for one half on to the rear spar, then fit top and bottom spars.
Tack cement the ribs lightly into place, add LE and repeat for other wing half. When dry, butt join the two wings together and add braces as shown. Build up the two piece TE and fit to wing, check for warps, and when satisfied, add the 1/4 in square TE cap.
Now re-cement all the ribs securely to the spars, bend the U/C legs to shape and secure to the ply formers, then fit in place between R.7 and R.8, and R.15 and R.16. The U/C doors are made from 1 mm ply wired to the U/C leg and covered with a Sandwich of 3/32 in balsa.
Fit the bellcrank assembly complete with pushrocl and lead-out wires, Cement soft 1/16 in LE and centre section sheet into place. Now cut the wing tip sheets from 1/8 balsa, glue to the main wing and fit tip ribs TR.1 to TR.6 to upper and lower sides of the port wing..."
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