About this Plan
Firebrand. Radio control sports aerobatic model, for 35 - 40 engines and 4 function RC.
Quote: "THE FIREBRAND'S design and construction history is rather a chequered one. It started life in the spring of 1972 on the drawing board as a full-size felt-pen sketch with a conventional fuselage and upright engine. In this configuration con-struction was started - and then stopped, with the wings finished and the fuselage half assembled. In the late summer of 1972 it was rescued from the corner of the modelling room and redesigned to its present configuration. After being finished I installed my radio gear, and due to lack of flying time it again went into storage.
Firebrand finally left the runway in February 1973 but, by this time, I was in the middle of a 'conversion course' from single-stick (LH throttle) to two-stick flying, so I handed over the tranny to clubmate Alf Beckham for her first flight. After one flight to trim out, Alf took her up on the second flight and flew through the FAI Schedule. After some dozen flights the model was withdrawn from service, a few minor mods made and some new OS DP.4P Cougar gear installed. Since that first flight Firebrand has now had over 100 flights, including completing my conversion to two-stick.
The prototype has done nearly all its flying fitted with an OS H40 lapped piston motor - which was built from two old ones - and for all-round flying a 10 x 6 Tornado prop has been found most suited to this combination.
The handling characteristics are very good at all speeds and in par-ticular its inverted handling is extremely groovy. The slow speed is really slow - you can almost walk alongside and adjust the needle. On landing approaches, typical of smaller models, allow a long approach for the machine to slow up but, if you like to do 'greasers', she will stick down like glue at even quite high speed.
In our flying group's fun contests the Firebrand has turned in 2.15 glide in a 30 sec engine run, and also won the open pylon over a to lap triangular course of nearly four miles at over 70 mph - this was done whilst running in a new '73 OS 40 with the motor being almost peaked for the first time, with a 10 x 6 Tornado.
So this is the Firebrand - a design which will give you a good 40 size Club acrobatic machine or, for the Sunday flyer who likes to stooge around, a good 35 would no doubt be ample. With a hot 40 and a 9 x 7 or 9 x 8 the Firebrand really comes into its own for free-style acrobatic/ demonstration flying, including pulling top hats on half throttle (at a fueled weight of around 4-3/4 lb).
CONSTRUCTION: Fuselage: Begin by cutting both fuselage sides from medium hard 3/16 sheet, making both sides full length (right side is cut away after assembly - see notes on engine installation). Add ply doublers, balsa tail doublers, and 3/16 dummy longerons and uprights..."
Firebrand, Radio Modeller, April 1974.
Direct submission to Outerzone.
Supplementary file notes
Article pages, thanks to RFJ.
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