Was tested and another embodiment of the fuselage foam. Of PVC material with thickness of 4 mm cut out all the details of the plating, even reinforcing plates. Despite the seeming “carelessness” of this design it has proved tough enough, and the operation is kept much whiter rough bumps and landing than with obrezkoj of plywood.
WING simple, specific explanations, neither its design nor the production technology are not required. Unusually marked only the steering servos – fiberglass fairing-mounting bracket. This suspension not only allows you to quickly attach and detach mechanism, but also to get rid of tabs on the top of the center section, which often interfere with the reset of the wing in case of unsuccessful meetings of the model to the ground.
Tracing and drawing the wing in full size, try not to distort the shape of the winglets. The obliquely cut ends of the consoles not only improve the shape of the wing when viewed from above, but serve to increase the stability of the apparatus. Such endings have given the supporting planes a relatively small angle of the transverse V (on the training models, it is usually increased in 1.5 times).
Mount the wing to the fuselage with the most progressive type. At the expense of beech pin inserted into the dural tube and the incoming center-8 mm in the second frame, and the nylon screw M5, pressing the rear edge of the planes wing to the box. When you hit the console on the ground in an emergency plastic bolt sheared, and the wing falls away from the fuselage. The ability of this attachment is to protect the model from breaking not less than the rubber bands, used in the past to primocki wing. But in flight it will not allow different parts of the model to shift relative to each other, and the appearance will benefit, not to mention the ease of loading and unloading planes during transportation or need to get to the radio.
Fig. 2. Fuselage:
1 – engine mount (beech 12X10 mm) 2 – front boss of the fuselage (basswood), 3 – triangular slats strengthen the junction of the motor bulkhead with the sides (Linden 8X8 mm), 4 – spar of the fuselage (basswood 5 mm). 5 – triangular slats-stringers (Linden 8X8 mm), 6 – panel (plywood 4 mm), 7 – lower valance, it is also the base of the wing fairing (plywood 1 mm), 8 – threaded boss (birch), 9 – Board of the fuselage (plywood 1 mm), 10 – panel Board (plywood 1 mm), 11 – compartment cover (plywood 1 mm), 12 – slot compartment cover, 13 – tail boss (Linden).
Fig. 3. Chassis:
1 – an additional side bar (will be glued when assembling the wing), 2 – landing gear (wire OVS dia. 3.5 mm), 3 – panel (1 mm steel), 4 – the screw of fastening of a cover.
Fig. 4. Model hog:
1 – thrust (balsa dia. 6 mm), 2 – pin (wire OVS dia. 1 mm), 3 – termination rod (wire OVS dia. 2 mm), 4 – biscuit pig (aluminum or nylon), 5 – hog (OVS wire dia. 2.5 mm), 6 – bracket (brass 0.5 mm).
Fig. 5. Stabilizer:
1, 2 filler (foam packing 5 mm), 3 – the mount of a hog. 4 – hole screw mounting stabilizer, 5 – ending (balsa 5 mm), 6 – fairing (balsa), 7 – pin (beech diam. 5 mm), 8 – pad (plywood 1 mm).
Fig. 6. Fuel tank:
1 – drain tube 2 – plastic Bank, 3 – speed intake, 4 – rubber tube of a fence of fuel, 5 – cap banks, 6 – supply and additional gas drain tube (optional after filling tank is closed).
Fig. 7. The design of the wing:
1 – the foam console. 2 – extra side rail mount chassis, 3 – spar-set (plywood 3 mm), 4 – cheeks of the boss (1 mm plywood), 5 – boss (balsa 15 mm), 6 – dural tube 10X1, 7 – toe support additional bulkhead (plywood 2 mm), 8 – the leading edge (balsa 5 mm), 9 – framing the trailing edge (balsa), 10 – pad (plywood 1.5 mm).
A few words about the profile. Making metal templates its shape, be very careful. After all, many of the advantages of this model is the result of applying the relatively new profile Е474, which, like other profiles Epler, requires careful seasoning of the circuit. We recommend you to rely on and build templates for chord 260 mm, after trimming them up to 250 mm at the tail trailing edge of the wing you can’t carry knife-like, which is very difficult, and dull. Е474 allows the unit to stay in the air even at low speeds, and unlike the models, the wings of which are of the profile type NACA 00…, the new brand is not prone to spontaneous breakdown in a tailspin with the loss of speed.
Interesting and different version of the wing structure. If you have the opportunity to use construction or packaging foam large size, cut out its console, using a metal template and heated by an electric current nichrome wire. Kleiv in the foam structural elements, fit an wing thick paper or fiberglass with a thickness of 0.1 mm on epoxy resin, it is necessary to duplicate the center section of this layer on the scale of 300 mm. to Collect and prepare such plane for coloring can be almost three times faster than normal, the weight of the foam wing, stacked loses only 20%.
STABILIZER profile flat plate, like Elevator, carved out of packing foam and banded rails. After processing, he glued thin writing paper. Mounted stabilizer like the wing, only the beech pin diameter less than 5 mm, and the thinner nylon screw – M3.
CHASSIS modern torsion type. When take – offs and landings on unpaved diameter stands should be increased to 4 mm.
FUEL TANK volume of about 150 cm3 is made from a plastic bottle of shampoo. On the model it should be fixed so that its axis was 10 mm below the axis of the jet of the carburetor of the engine. In the manufacture of the tank check whether there is enough weight on the end of the intake rubber tube – in any position of the tank it needs to reach the walls of the tank, which will ensure uninterrupted supply of motor fuels.
THE ELEMENTS OF THE MANAGEMENT SYSTEM. Control horns are made so that allow you to adjust the length of the shoulders is useful in debugging deviations of the rudders and ailerons. First, get lowering or raising the breadcrumbs of hogs through the thread, the following maximum angles: Elevator ±20° rudder ±30°, ailerons ±15°. Such angles ensure ease of management when you first starts. Subsequently, they are adjusted depending on the properties of the model, requirements and… temperament of the pilot.
Pay special attention to mounting the rudders. The main condition – the ease of movement with minimal backlash. The prototype weighed were the nylon ribbons of a width of 15 mm, glued under the skin before the exterior of the apparatus So that the axis of rotation of the elements is practically on the surface of the tail or wing. Wedge-shaped grooves on the flight properties of the model are not affected.
ENGINE – “rainbow-7”. Used with the standard propeller, muffler, and carb controlled, has a modified piston group. Latest lightweight, which allowed to reduce the level of vibrations, harmful influencing the resource model and the reliability of the machines.
The external finish of pilotage ordinary, no different from the widely used model in practice.
Before the first start check the position of the centre of gravity – he at first must be within 30% of the SAH (mean aerodynamic chord). After the “acquaintance” from the flight properties of the model this distance can be increased up to 40% of SAH.
FIRST FLIGHT is a joyous and exciting event. But don’t let the emotions make you forget about pre-launch preparation. Check the installation of the tank and the engine, the position of the center of gravity of the model, ease of movement servos and their proper connection, the lack of the curvature of the wings and tail, the condition of the batteries.
Immediately before you start check the operation of the engine, the stability of the idling conditions. It is useful to look at the properly functioning equipment in terms of vibration from the running motor, how easy and right to roll the model on the runway.
First better off with wheels. If this is your first microplane with the engine, charge it oblamyvanii a more experienced colleague. If a good runway could not be found, the new model (of course, with no swirling and planes are correctly aligned) may start from the hands. It is better to have an assistant, for whom the throwing of these projectiles is not new.
The coordinates of the PROFILE Е474
Once you find the correct position of the handles of the trimmers on the transmitter, taking off with his hands is no more difficult than on earth, and no less spectacular. Set just before the start of the trimmer of the Elevator in the “up” position and fully fill the tank: empty it can cause stalling of the engine at the most inopportune moment. After a set of normal flight speed trimmer this translates into optimal position.
Now pick up a higher model (of course, leaving her within sight and range of radio equipment). At first need to remove the gas engine. Although this will reduce the possibility of maneuver in the vertical plane, but will help you familiarize yourself with the temper of your “acrobat”. In test flight, do not attempt to run the entire complex. Start with the simplest “flat” shapes (u-turns by a specified angle, the implementation of “boxes”). In subsequent workouts check how the device reacts to vigorous action controls the ailerons and Elevator.
When you “friends” with a flying model, you can test your skills in performing simple acrobatic figures of the complex. An experienced pilot is similar to the microplane seemed to be sluggish to control, but to study this, with a high degree of stability. Subsequently, the controllability can be reduced to the requirements of championship models by moving the center of gravity of the machine in the extreme rear position.
Cu S to 34.5 DM
Article S – 6.5 DM
R – 1600 g
R – 46 g/DM
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