About this Plan
Diablo. RC aerobatic slope soarer, for 2 or 3 functions.
Quote: "The model on the cover! Build this ultra-slick low-wing aerobatic sloper by Chis Smith.
WHEN THINKING about designing a new acrobatic model, just over a year ago, it seemed to me that the designers of slope soarers had, on the whole tended to fight shy, in the past, of the low-wing configuration, the standard argument being that they are unstable and more prone to damage - or, perhaps just 'don't took like gliders.' Hence, Diablo was evolved to disprove these arguments, and to show that it is possible to make a really practical low-wing slope soarer that is also (I think) reasonably attractive.
After progressing from a Soar-Cy (oz8721) to an Avenger (oz7661) (both RM plans) I decided that this model should be fast and fully acrobatic; therefore, a fairly thin, fully-symmetrical wing-section was called for. In fact, the well-tried fully symmetrical version of the Eppler 374 was used, which has proved a great success. And so, to the model.
Radio Installation. Now you are probably wondering why I am talking about radio-installation before construction is even started. This is due to a slight modification that must be made, when using certain types of radio gear, before construction can begin. The Diablo was originally designed around 2-channel gear, which had a conventional 500 mAH 'cylindrical' nicad. This gear comfortably fitted in the positions shown on the plan. However, it was later changed for some 6 function par which, like many other modern outfits, uses the '4 pencells in a box' type of nicad. This is a little to large to fit in the front compartment of the fuselage, and so the small, necessary modification is as follows.
You should cut a hole in former F2, that will just allow the nicad to pass through; the nicad can then occupy the space between F1 and F3 in the finished fuselage, well protected by foam rubber. The receiver then occupies the space between F3 and F4, and the elevator and rudder servos can then be mounted behind F4, inverted (relative to the model). Of course, if your gear has a cylindrical nicad, then the position shown on the plan should be used.
CONSTRUCTION. Fuselage and fin. The fuselage construction is quite conventional, with the notable exception that the fin is built as part of the fuselage, and is in fact merely an extension of it. This design point was an attempt to eliminate the weak point that most gliders seem to have..."
Diablo, from Radio-Modeller, February 1977.
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User commentsBrilliant flyer. Built mine in 1977 and it's still flying. Only change has been to split the full span ailerons to add flapperons and crow braking to land. If you do build this watch out for the tail incidence. A friend built the fus and then passed it on to me. He glued the tail on to the rear fuselage as it is built, not noticing that the tailplane has to be cut into it at a slightly different angle. Result has been that the wing has had to be packed out at the back to get the right incidence. One day I'll cut the tailplane off and do it correctly!
Keith England - 03/04/2019
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