About this Plan
Callisto. Radio control sailplane model. Wingspan 100in, wing area 843 sq in. Airfoil is Eppler 193.
Quote: "If you want a high-performance RC Sailplane, this one is for you. It takes the configuration of current F3B designs and combines that with a lightweight and strong structure for AMA-type contests in the Modified Standard class. It's a winnner!
SAILPLANE DESIGNS for Thermal Duration events in the U.S. have not changed dramatically in the last several years. Subtle im-provements in airfoil shape, lower drag, etc., have appeared, but the predominant basic design is still the floater type with polyhedral and controls of rudder and elevator. However, in other parts of the world, mainly Europe, large ad-
vances in FAI F3B Sailplanes have recently occurred. F3B Sailplanes are generally built stronger and heavier (to survive the Speed task) than what is used for Duration competition. Attempting to com-pete with an F3B plane in a Dura-tion event against a floater type often results in the floaters turning in better times under light air conditions.
The Callisto is a Sailplane of the F3B configuration, but with a wing loading comparable to current Standard-class planes. The prototype has a 7.26 oz / sq ft wing loading. The plane utilizes coupled ailerons and rudder, a T-tail stabilator, and spoilers for speed control. It has a built-up fully-sheeted wing (resulting in exceptional strength) and a smooth airfoil.
Drag has been kept to a minimum by using a slender fuselage, thin tail surfaces, and smooth contours.
Ballast tubes are incorporated in the wing. Ballast loading is accomplished through the spoiler bay; thus the wings do not have to be removed for changing ballast. One set of ballast tubes holds 39 oz of weight. A second set can be built to double the capacity.
Flight performance has been better than ex-pected. Maneuverability with the coupled ailerons and rudder is a vast improvement over conventional controls. The turning response is immediate with no lag time..."
Callisto, Model Aviation, October 1982.
Direct submission to Outerzone.
Supplementary file notes
Article pages, thanks to RFJ.
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