FROM THE IDEA TO “BOUZOUKI”

Typically to achieve the necessary alignment of heavy fighting model of the micro retracts in the cutout of the front edge of the wing. This leads to some loss of strength and complication of manufacturing technology, and access to the engine for maintenance is much more complicated. So I had the idea to implement the idea of forward-swept wing is given in the “M-K” № 7 for 1988. Front and rear edge of the wing of the new models are made by gluing pine veneer (thickness of 2-1. 5 mm) on the mandrel with the subsequent cutting on a lathe to the required edge thickness. The bonding is conducted on the PVA. Mandrel is more practical to manufacture of chipboard, and in the mounting position and clamp the veneer pack to apply a lacquer coating to facilitate removal of the part after drying.

The design of the Central rib of the type “sandwich”. Plate construction foam (7mm thick) paste the sides with a phony veneer of thickness 1.5 mm. Pre-in front and rear portions are inserted pine plate thickness equal to the plate of foam and a length sufficient for mounting the motor and rocking. The whole set of glued on PVA and after drying is processed according to the profile. To facilitate in the Central rib, holes are drilled with a tubular drill bit, is made of thin-walled steel tube of suitable outside diameter, with sharpened cutting edges in saw teeth.

 

Central rib:

1 — front edge (5X3 mm pine veneer thickness 1.5 mm), 2 — power part of the rib (pine 7 mm), 3 — boss (Linden 7 mm), 4 — side panel of the Central rib (Linden 1.5 mm), 5 — a reinforced trailing edge.

Ribs and wingtips from Linden veneer 2 mm thick. the Forehead is cut out from packing foam and pasted over paper with the use of PVA.

 

The Elevator is made of construction foam, paste on the perimeter of the pine rails and fitted by a Mylar film. In places the hanging rudder trailing edge reinforcing strips, inserted from the inner side and equal to the thickness of the edge; all paste pine veneer (1 mm thick). The wheel is hinged at the rear edge by two hinges made of sheet metal and steel wire Ø 2 mm.

 

Control system: to simplify construction, the chair control is mounted on the wing on a removable axis Ø 3 mm and is made of fiberglass 2 mm thick. Pull out steel wire Ø 2 mm, pig rudder — strips of tin, bent in half. Guides for cord — steel, wire Ø 1 mm — glued with epoxy resin.

 

Engine mount from the dural corners. Good characterization gives the engine mount of beech bars section 11X11 mm. the Weight ratio of the motors of these two materials is almost identical. When testing the model with a modified KMD-2,5 even if the alignment 18-20% of SAH showed good maneuverability during steady horizontal flight. Installation CSTOM nitro-2,5 given the opportunity to achieve alignment in the range of 25-27%, even with the installation of the Elevator stacked design with a weight of 6 g. With the increased agility by reducing the moment of inertia of the tail section.

 

In the end I would like to warn about the correct definition of SAH with a similar wing sweep, to avoid errors when setting the position of the center of gravity.

Dimensions models:

1 — spar (pine 3X7 mm) 2 — guides for cord, 3 — container for tank, 4 — pads (Linden 4 mm), 5 — area (plywood with a thickness of 1.5 mm), 6 — rear flange (7X3 mm pine veneer thickness 2 mm).

 

Weight characteristics of structural elements of the model, g:

 

 

I. VEPRINTSEV, head of the society of the city of Navoi, Uzbek SSR