Blackburn Monoplane - Free flight scale model.
Quote: "IN THE December 1951, Aeromodeller George Cull described the 1912 Blackburn Monoplane and captioned: 'will surely make the flying scale modellers reach for their drawing boards' - I did! Eighteen months of development have produced this exact scalemodel - not for the piano top - but for safe scale type flight. Thanks to the low wing loading, auto rudder, generous tail area and the 1947 Amco .87 up front, this has been achieved.
Dihedral, airfoil sections, wing and tail areas are scale. In the interest of flyability a number of rigging wires have been omitted and a peculiar tail trimming device incorporated. Although rather unconventional, this latter arrangement works perfectly and is very robust.
The prop diameter is slightly below scale size. With an eleven inch scale prop the little Amco would only run when the needle valve and compression screw were removed! The model is always ROG'd and never pushed. Hard-bitten power duration men stand and gape when, with the Amco gently misfiring, auto rudder wagging and the intrepid aviator's scarf blowing in the slip stream, the Blackburn rolls forward. A 35-40 ft take-off run is followed by a gentle right hand climb to a 30 ft ceiling. For an unknown reason, probably connected with auto-ruddery and pendulum inertia, the normal wide circle flight pattern is sometimes enlivened with a figure of eight. The tank has a 12 minutes flight capacity—so old 'hat-on-backwards' has got some hours in.
Low air-speed, about 7 mph flat out, and light weight reduce the chance of serious damage. It is, however, essentially a calm weather job - as also is the prototype which cavorts regularly at the aeronautical garden party. And there's a point there, for if your club is one of those publicity minded co-operative groups that are constantly asked for demonstrations at local affairs, the Blackburn is a certain crowd-puller..."
Direct submission to Outerzone.
Update 15/06/2016: article page, text & pics added, thanks to RFJ.
Update 28/02/2018: replaced this plan with a clearer copy (patterned background removed), thanks to hlsat.
Previous scan version.
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