SE 5A Building instructions : Translations for the plan : obere/untere Tragflache : Upper/Lower Wing Boden : Floor Seitenteil : side panel Spant : Former Seitenansicht : side view Building instructions for the Indoor SE5a /Indoor Flyer Materials required : - ~ 1m^2 (10,76 sqft) 3mm (1/8") Depron sheet (extruded polystyrene foam, without a beaded texure) - 2 x 1m 1.2mm (3/64") diameter Carbon Rods - 1 x 1m 1.8mm (1/32") diameter Carbon Rod - ~ 20 cm (10"), 1mm(1/32") i/d silicon tubing - a piece of 0,5mm (1/64") plastic sheet, (e.g. lid of a plastic food package) - 30 cm (1ft), ~10 mm (1/2") diameter insulation foam "noodle" for the wheels - Carbon rovings or black thread - clear adhesive tape, double sided (servo) tape - foam friendly contact adhesive - thin Cyanoacrylate Components for R/C installation : - 2 x servos 5.6 or 9g type servos (e.g. HS-60 or HS-50) - 1 indoor ESC capable of handling at least 4A - 1 micro reciever - 1 geared motor ~25 g and with 15-20 W power input/output??(e.g. Faulhaber 1624 / 3 V with 11.8:1 gearing) - 9 cell battery pack (e.g. Sanyo 120mAh) - 1 Indoor Propellor ~ 10x6" Preparation : Print out the plan pages, glue them to thin card and cut them out to form stencils. The required numbers of each part are noted on the plans. Note that the upper and lower wing panels are of different spans, and that a pair of each is required. Bending the wings and fuselage decking: Practice bending the Depron with scrap pieces first, a rounded table edge is an ideal surface to bend them over. The wings have a large camber for the leading 1/3 chord, a lesser camber for the middle 1/3, and a flat trailing 1/3. The maximium camber of the wings should be about 10mm (1/2"). Due to the low Reynolds numbers we move in, the exact shape of the section is not very important, but ensure that the right and left halves match. Before bending the fuselage decking, apply packing tape to the outside, this helps prevent the Depron cracking. Bend the middle decking part before cutting out the cockpit. Sand the leading edges of the rudder and elevator tabs to allow for control surface movement. Building : Landing gear and struts: Build these directly over the plan, holding the rods down with double-sided adhesive tape. Use CA to tack glue the joints with CA, then bind with carbon rovings or thread and secure with more CA. Fuselage: Use foam-friendly adhesive for all joints. Score the top surface of the floor sheet at the dotted lines to allow for the taper. Glue F2 at right angles to the floor, making sure there is 3mm (1/8") clearance on either side for the fuselage side panels. Glue the landing gear/carbane frame to the rear of F2, the horizontal bar goes below the floor, and is secured with another sheet of Depron. Mark the angle of F3 on the inner surfaces of the side panels, and glue the central sections in place together with F3, ensuring that the sides are square and the F3 remains at the correct angle. Glue the remaining formers in place and glue the tapered front and rear sections or the side panels to the floor. Make the battery cover a tight fit in the front of the fuselage. Glue the tailplane and vertical stabiliser to the fuselage, this will be reinforced by the rear decking. Check the fit of the middle decing section, and make holes for the cabane struts. These points should be reinforced with plastic sheet as in the wings. The forward decking is made to be removable to allow access to the motor and battery. Glue the tail skid to the rear of the fuselage. Wings: Reinforce the points on the wings where the struts pass through with small (10mm^2,1/2 x1/2") pieces of plastic sheet. Those for the upper wing go on top of the wing, those for the lower wing, below. Chamfer the joints between the middle and outside upper wing panels to give a good fit with 3cm (1 1/2") dihedral at each wingtip. Glue them using the foam adhesive. The lower wing panels fit to the fuselage and should be similarly chamfered to give the same dihedral. Assembly: The lower wing panels can either be glued directly to the fuselage, or attached with carbon rods and short lengths of tubing. Push the carbon struts through the holes in the wings and secure with short lengths of tubing. The elavator and rudder tabs are attached with clear tape. Paint using foam-friendly paints. Installation of R/C gear. Use what ever method you prefer, but I include a few suggestions as to how I did it. The servos are attached to the inner surface of the fuselage with double sided tape. The pushrods were of 1.2mm (3/64") diameter carbon rods with linkages of 0.5mm (1/64") diameter wire, attached with heat-shrink tubing and CA. Control horns were fabricated from plastic sheet. I mounted the motor in a foam box that fitted snugly into the nose. The centre of gravity is positioned halfway between the cabane attachment points on the upper wing. This plan was made for people who know how to adjust a model airplane, so there are no further information how to make the first flights. The deflections (?) of the control surfaces should be as big as possible, don?t be afraid to use some values > 30?. For further questions, ask Ralph Pinkhaus r.pinkhaus@tu-bs.de or take a look at http://www.unisport.tu-bs.de/~modellflug Plans by Ralph Pinkhaus Translation by Martin Pike Published by Patrick Wegener 31.01.?00
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