About this Plan
Karousel. Radio control sport trainer model. For .15 diesel engines.
Quote: "Rudder, elevator and motor control will provide all the action for fun filled Sundays and Class A/ B events. Inherent stability makes this craft an ideal choice for the beginner to R/C flight and construction is an ideal stepping stone to your dream airplane.
The Karousel was designed as an intermediate sport model employing rudder, elevator and motor controls. The model provides relaxing fun at a modest investment and is designed for R/ Cers who have finished the rudder-only stage; this is an ideal trainer to fly while perhaps constructing that long-awaited dream ship. At this stage you still need inherent stability of the model and this quality is better possessed by cabin designs than any other type configuration.
Although the Karousel is not intended for acrobatic flying, the model is capable of performing most sport-stunt maneuvers. To satisfy this desire, the wing features a semi-symmetrical airfoil which provides stable inverted flight characteristics as well as smoother loop maneuvers. To subdue lateral yawing tendencies (which would become evident particularly in windy or inverted conditions) the wing dihedral is reduced.
The Karousel may be equipped with ailerons (not shown on the plan) to greatly increase the acrobatic capabilities of the model. However for general training purposes, the rudder alone provides completely sufficient controls, making ailerons unnecessary.
The model wingspan is 49 inches and has approximately 410 square inches of area. Suitable powerplant is in the .15-23 range capacity. Any radio system providing rudder-elevator-motor controls can be used in the model. The prototype is powered by a .15 R/C diesel engine. The control system was originally the German Variophon 6-channel outfit, but this equipment was later replaced by the Japanese KO Digiace 4-channel digital proportional system. Installation of the latter radio system is shown on the photograph.
Construction-wise, the Karousel features easy and straightforward building methods. Structurally, however, materials specified often are on the large side. This has been done intentionally because it is more convenient and rewarding to work with oversize wood than thinner (and harder) materials. To keep the weight under control, therefore, it is necessary to select balsa wood of only medium density throughout the entire construction.
CONSTRUCTION: The wing can be built in one piece, or each half may be built separately, joined at proper dihedral angle when ready for center balsa sheet covering. If the former is preferred, join two flat boards, blocking up the ends to obtain the specified dihedral angle. The latter was chosen in constructing the original wing, so this building method will be described.
Prepare all components before starting the assembly. Pin down lower main spar directly on the wax-paper protected plan, not forgetting to place scraps of 1/16 under the spar to allow for sheeting later. Glue all ribs in place over the spar except the parted center rib WA. Be sure to prop up the curved ribs in perfect alignment while the assembly is drying. Otherwise you would have built-in warps in the wing which will be difficult to eliminate completely. Locate top spar and leading edge while the panel still is pinned down. Allow sufficient time for cement to thoroughly dry before removing from the board. To fit trailing edge, remove the panel and lay it vertically on its leading edge. Carefully slip the trailing edge notches into the rib ends, checking frequently to be sure the trailing edge follows the rib contour exactly. The same procedure is used for assembly of the right wing.
To incorporate dihedral, bevel-sand butt ends of each panel so they meet at correct angle. Use plywood braces to check alignment. When tight joints have been obtained, glue brace BB in position. Add the remaining braces and center rib. Add all sheetings and complete outer section of each winghalf in accordance with the plan. Finally, fit hollowed tip blocks and sand the entire wing.
Tail: Construction of the stabilizer is best carried out 'in air' rather than on a flat board with regard to the location of the main spar. For the main spar, a hard and absolutely straight stock must be used. Slide and cement ribs onto the main spar from center outward. Locate one rib at a time until cement sets; align if necessary while glue is drying. Next, fit rear spar and leading edge. Adding the specified sheetings and tip blocks finishes the framework of the stabilizer. Sand the completed structure, rounding off all edges..."
Karousel, MAN, June 1970.
Direct submission to Outerzone.
Supplementary file notes
Article pages, thanks to RFJ.
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