Kadett (oz852)

About this Plan

Graupner Kadett. Free fight power cabin sports model.

Plan includes full build instructions.

Quote: "High-wing cabin sports plane designed for flying fun, on fine, sunny days and in windy weather. Truly amazing glide characteristics. Essentially for power-flight beginners, to suit Half-A to A-Class (beam-mount) model engines. Expressly designed for the well-known TAIFUN 'Hobby' Model Diesel Engine.

Data: Span: 46 in.
Length: 31-7/8 in.
All-up weight: 470 grammes (16-1/2 oz).
Designed by: Karl-Heinz Denzin.

General: Herewith, 'GRAUPNER precision-modelling' proudly present 'CADET'. Development of this snappy free-flighter took many months of painstaking building and flying. The result is a foolproof, easy-to-build, easy-to-fly beginner's power model. CADET is suited to any kind of flying weather and will stand rough handling.

Engine type range is wide. CADET takes Half-A to A Class, glow-plug or diesel power plants equally well. The test-models were all TAIFUN 'Hobby' diesel powered. This precision built .06 (1 cc.) engine again proved to be a really powerful and ideally suited motor. Plans far "CADET' have been prepared full-size; oil individual parts are shown in detail. To simplify matters, dimensioning of parts was largely discarded.

We recommend you use a flat working-board 8 by 32 inches approximately, covered with wax-paper, to assemble your replica of CADET. Pin down plan to board, add another layer of wax-paper over it. Use plastic head modelling pins to hold parts securely for assembly and cementing. Employ a quick-drying type of hobby-cement, also for fuel-proofing the engine compartment.

Building Instructions: The Wings: Prepare wing-spars (1), (2) and (3); cut out ribs (4) and (5), plus wing-tips (6). Trim ends of main-spar (2) as per sectional view B-8. Assemble and line-up parts for one wing-pinion only, pin down till the cement has set. Be careful over adding the wing-tips (6) at the correct angle of bevel.

Assemble second wing-pinion in the very same way, after having taken off the first half from the board, and having reversed the plan drawing. Where the wing outline won't show through so clearly, pin-holes now may serve as a guide. When second wing assembly it dry, trim inner spar ends to precise length and bevel; pin one pinion down to building-board. Block up the second one for the required dihedral of twice 4-3/4 in, right under the tip edge. Cut from ply dihedral braces (7), (8), and (9) which may also aid to fix the correct angle. When center assembly of wing has dried - to which 3 ribs (4) have been added - check, that Leading- and Trailing-edges are free from warps. Round in Leading-edge. Use a plywood profile template to guide sanding work.

The Empennage: With the experience gained in building the wing, it is a very simple affair to assemble the stabilizer. This time, there is no dihedral. The tip-section can be seen in diagram A-A. Cut fin front (15) and rear part (16) to shape, which are butt-joined. Sand to streamline section. Cut away trim-tab and replace same, after having added light alloy hinges (17). Insert fin between stabilizer center ribs. Check for dead right angles and alignment; cement, secure with pins, and allow to dry.

The Fuselage: Measure the accurate crankcase-width of the model engine chosen to power CADET. Cut engine-mount spacing block (19) to match your powerplant precisely. Carefully assemble block (19) to bearers (18), pre-cement joining surfaces. When dry, add another coat of cement, join parts and press for 24 hrs. When dry, drill bearers to suit engine mounting lug holes. You'll have to cement securing-nuts for the engine to the bottom of bearers (18). Re-coat their seating to be sure the nuts stay in place. Add to engine mount, cowl sides (20). Note the correct angle of downthrust called for. After cementing, put aside to dry. Cut out and drill firewall (25); bend to shape landing gear wire (26) and bind to firewall, using strong linen thread. A better method still, is to use a fine capper wire binding, soldered eventually. As the iron is hot anyway far this operation, install the wheels now by soldering a pair of washers to either wheel side, on the axle-stub. Don't apply too much heat when installing plastic light-weight landing wheels. They're prone to melting.

Assemble firewall (25) to engine mounting frame. Again note dawnthrust! Add a small free-flight type fuel-tank to the upper side of spacing block (19). Then, put cowl top (21) and bottom (22) in place. Rub inside of cowl with two or three coats of cement to make it thoroughly fuelproof. Extend filler-, vent-, and feed-tubes of tank with neoprene tubing. Plug same temporally, to ovoid balsa dust from getting into the tank. Cut out fuselage sides (23), insert cabin braces (24). Pin one fuselage side down to building-board, assemble engine mount and firewall to it, put in place cabin cross-member (29 and bulkeads (30) and (31).'Line up well before cementing... "

Update 24/03/12: Added 2nd page to plan, with exploded parts view.

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