Pronto - Radio control low-wing sports model. MAN August 1972. 48in span, 384 sq in wing area, for .15 to .25 power.
Quote: "Welcome to the Pronto! Since you have decided to read this, it is a fair assumption that you are already somewhat interested, and are seeking enlightenment. First, I would like to establish a few things about the Pronto - for example, it will not fly the complete FM Pattern with near perfection, and therefore is not the optimum Pattern design for 1972. Also, it is not the perfect trainer for a potential modeler who wishes to learn to fly alone and unaided (more on this later).
Now that I have eliminated the major reasons for most new designs, perhaps I ought to fill in with a little background on the Pronto. Pronto dates back to the early spring of 1971, when it was designed to fill a gap that I feel exists in our selection of Sport models. Okay! I realize that a Sport model can be almost anything from a scale, six-foot P-51 to the Junior Falcon (oz8144) rudder-only it kind of depends on individual taste. Sometimes it also seems that a model is tagged as a Sport design or 'Sunday flyer' because it doesn't cut the mustard as an adequate Pattern ship by modern standards. The Pronto was designed with the following requirements in mind:
1) It looks like a real airplane.
2) Fast, easy construction.
3) Small, economical engine requirements.
4) Good qualities as a trainer, especially to prepare a modeler for the advanced low-wing Stunt planes.
5) Fun to fly in a confined area with undeveloped runways.
The optimum arrangement with the Pronto seems to be when it is equipped with a 3-channel control set-up, and powered with a good .15 engine. At one extreme, it does OK with an .09 and rudder only, and at the other extreme it goes like a bat when powered with a strong .23! As of now, about 25 Prontos have been built and flown by a variety of people with various skill levels, and all have expressed pleasure with it.
Perhaps its strongest area is as a pure 'fun' airplane for the pilot with some stick time who is looking for a change of pace. Earlier, I pointed out the Pronto's unsuitability as a Pattern aircraft. Actually that is misleading 'cause the Pronto can be a very maneuverable airplane in skilled hands. For a full Scale parallel, watch a hot pilot wring out a J-3 Cub at near ground zero altitudes. The Pronto instills that same feeling of confidence in your plane. The maneuvers you do may not be 'ten pointers' but they still look great to the crowd of uninformed spectators.
Construction Tips: Rather than go into a blow-by-blow construction article, I would rather discuss a few points of interest and importance. First, the basic construction - I have found it a big help to sort of cut out a 'kit' of parts before actual assembly is begun..."
This is a pdf file that includes 3 pages of the original designer's drawings, along with a 4th page full-size plan blown up from the MAN article page.
Update 13/05/2016: article pages, text & pics added, thanks to RFJ.
Article pages, text & pics.
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