Mistral II (oz15410)

About this Plan

Mistral II. Radio control slope soarer model. Wingspan 3020 mm.

Direct submission to Outerzone.

Cleanup by Circlip.

Update 13/7/2024: Added article, thanks to Doro.

Quote (google-translated): "Construction plan 695. RC glider model MISTRAL II/I, by Jan Bartovic/CSSR.

The glider model 'Mistral', designed for thermal flight, is built entirely from balsa wood. It was originally designed under the name 'Mistral I' for the medium class with a wingspan of 2,500 mm. Even while the first prototype was being built, a decision was made to go for a larger wingspan, which was hoped to increase performance. The other parts of the model remained unchanged; the larger version with a wingspan of 3,020 mm was created under the name 'Mistral II'. The wing outline of the model Mistral I is included in the MT construction plan for information and of course also for reproduction; the latter for those model pilots who prefer medium class models.

Both Mistral I and Mistral II are characterized by good flight performance, their stability is excellent, and both are suitable for enriching the model fleet of the demanding model aircraft sportsman with a 'good piece'. In terms of construction, the Mistral does not deviate from the majority of those models that have always been flown in this category. The fuselage is designed in a relatively simple, box-like shape and the wings are also built in the conventional way; they are broken in a U-shape, their wing tips are negatively twisted. The fuselage and wing halves are held together with plug connections. The model is equipped with a pendulum horizontal tail unit.

Fuselage assembly instructions: The fuselage base is formed by the side parts 9, which are cut out and processed according to the construction plan. Both parts are sanded together in the same shape; the reinforcements 7 are then glued to the inside. While the glued areas are drying, the fuselage frames 2 to 6 can be made from plywood. The subsequent assembly of the fuselage takes place on a flat construction board, which is made easier by the flat fuselage bottom 10. The fuselage frames are glued between the side parts using UHU-plus. Make sure they fit carefully, especially at an angle! This means that the main work on the actual fuselage is almost finished. A piece of balsa wood that corresponds to the thickness of the tail unit spar is then temporarily inserted in place of the tail unit spar. This allows the fuselage end to be freely shaped according to the construction plan. Once the straightness of the fuselage frame has been checked, the fuselage bottom 10 can be adjusted and glued.

In the meantime, the vertical tail unit is built and completely manufactured, including lever 13. Work on the fuselage can then continue. - A piece of the longitudinal belt 8, approximately 20 cm long, is glued to the upper edge of the fuselage (at the rear); it is provided with the recesses for the vertical stabilizer and the lever arm 13. The vertical stabilizer can then be firmly glued with UHU-plus and the two Bowden cables for the rudder and pendulum elevator can be pulled in. The entire longitudinal belt 8 must then be fitted and glued. Now only the fuselage tip 1 needs to be worked on and the intermediate piece 24 for the high-start hook glued in and attached to the frames 4 and 5 with polyester fabric.

After all the glued areas have dried, the fuselage is sanded down cleanly and, above all, the edges of the 'box' are evenly rounded off (see section of frame 3). - The cabin of the model is pressed from 1.5 mm thick Plexiglas or molded from other plastic. Very important are the holes for the plug connections 25/26, the correct gluing of the wing/fuselage transitions and the same setting angle on both wing halves. After a final sanding, the fuselage can be painted.

Wing: Light balsa wood should be used to build the wing. The ribs 37/37a, which serve as templates, are cut out of 2 mm thick plywood. Balsa ribs for the middle part of the wing and the plywood ribs 37b and 37c are cut according to pattern rib 37; with the latter two, attention must be paid to the holes for the plug connections (25/26). The ribs for the outer wings ('clocks') are to be made using the block method and using pattern ribs 37 and 37a..."

Supplementary file notes

Article.
Parts list.

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