About this Plan
Firefly. Radio control sport aerobatic model. Wingspan 35 in, for 049 engine and 2 or 3 channels.
Quote: "The design for the Firefly was first drawn up over a year ago and was intended to be a practical and compact sports model which could be left in the boot of a car to be flown after work (or in my case, after school.) I decided to use a Cox 049 since it only needs a 1.5v battery and a bottle of fuel to operate which makes the model even more convenient.
I was unable to begin construction until about four months ago when I applied for, and was awarded, a grant from an enterprise scheme handled through my school, Trinity School, Croydon. After receiving the award, I soon started work on building a prototype model from the initial design. This was soon up and flying and I took it along to the ASP Designs Day on April 24th.
Firefly 1 flew well but, nevertheless, I felt that certain alterations to the construction would improve it. The main change from the construction point of view was plug-in wings and a vacuum formed canopy and cowling.
Fuselage: The fuselage follows the usual method of assembly being made from sheet balsa around several square formers. The fuselage sides are made up from 1/16 balsa with doublers at the nose and at the tail - also cut from 1/16 balsa. Between the doublers the fuselage is reinforced with 1/8 x 1/8 strips horizontally and vertically. The first two formers are fairly close and it is easier to have previously wet the nose and let it dry, clamped to some curved surface. The two sides are then glued around the formers, preferably using a jig, and certain formers reinforced with balsa strips.
The nose is designed to take the Cox Dragonfly engine so has the engine firewall a distance from the first former which is constructed from 1/8 balsa..."
Direct submission to Outerzone.
Firefly from Radio Modeller, October 1994.
Supplementary file notes
Article pages, thanks to RFJ.
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