About this Plan
Wyvern. Free flight sports power model with .75cc Mills power. June 1951 Aeromodeller. This is a modern redrawn plan in PDFvector format.
Quote: "Build this Bowden Contest winner - a precision baby of proven performance for motors up to 1 cc by Geoff Dunmore.
The Wyvern was designed in 1948, and has since flown with great success, winning the Bowden Trophy at Cranfield Aerodrome in 1949, despite the strong winds and rain prevailing during the course of the contest.
The main features of the design are its tricycle undercarriage, twin fins and dihedral tailplane. The pylon effect, ie mounted fairly high and set well forward, the centre section of the wing being cut back to suit the contours of the fuselage, is further elaborated by the use of the NACA 6409 airfoil, which I have used on my pylon designs with great success. The model is powered by a .75 cc Mills diesel, although suitable engines ranging from .5 cc to 1 cc could be used.
Trimming and Flying: On the original model it was not found necessary to make any alteration to the trim, but where a different engine has been fitted this will probably alter the balance. Gliding tests should be carried out, and if any appreciable alteration has to be made, it is best to add a little plasticine to the nose or tail, and only make minor adjustments to the tailplane setting.
Having obtained a flat and straight glide, start the engine and run as slowly as possible. Wait until there is only a very small quantity of fuel in the tank, place the model on a flat surface, and let it take off. After one or two short flights, during which the model should have been finally trimmed and the engine gradually speeded up, long flights can be undertaken..."
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by Geoff Dunmore
IC F/F Cabin
all formers complete :)
got article :)
Found online 11/12/2011 at:
Format: • PDFvector • CADfile
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