model aircraft for air combat with electric motor Speed - 400
The emergence in recent years of specialized model shops is relatively inexpensive and quite powerful motors allowed to transfer a number of classes of aircraft models to electric drive. The result was the emergence of a new aircraft modeling of his admirers, who had previously stayed the need to acquire a model internal combustion engine with all its attendant problems - their high price, low-life, low reliability, and problems with the acquisition of fuel components, difficulty starting, running and operation.
We offer our readers a model of air combat with motor Graupner Speed-400, which is the operating voltage of 7.2 V to power the motor easier way is to use the motorcycle battery to 12, taking into account the voltage drop across the current-carrying cords motor terminal voltage should be close to worker. When you run it's best to place the battery in a bag with a shoulder strap or in a small school bags. Engine start toggle switch located on the control stick.
The model of the design is not very different from those that are created by internal combustion engines, it is only slightly decreased. Spar pine shelves, variable section - 8x3 mm in the center and at the ends of 4x3 mm, a wall - made of plywood thickness of 1 mm. Forehead wing - from packing foam, electric cut made of saws, which instead of the steel deck stretched nichrome heating up the electric current thread.
Leading edge - a section of pine strips 2x10 mm, rear - pine slats 5x5 mm. Central rib cut from balsa plate thickness of 5 mm, the rest - from plates 3 mm thick. All the ribs on the perimeter edged strips of balsa section 8x2 mm - this increases the rigidity and strength of the overall model. Ending - balsa, from plate thickness of 5 mm. At the outer edge lines are fixed lead weight weighing 15 - 20 g
Tail and elevator are also made of balsa. Joints of the elevator - from a nylon thread, braided around the steering wheel and the liner "eight" engine is mounted in a fiberglass cage, vykleennoy of fiberglass and epoxy binder on the disc, the diameter of which is the same as that of the motor. The length of the cage makes sense to do with the stock - this will allow for debugging model change its alignment, moving the engine forward or backward.
In the wing clip is secured with epoxy glue. After final adjustment clip is cut to the motor is wound strip or two of vinyl electrical tape or duct tape, which allows him to fix reliably rocking control cut out of fiberglass (you can use other insulating and sheet material is strong enough) with a thickness of 2 mm.
Secured it in the slot of the central rib, between the two washers, its axis is the segment dural needle of 2.5 mm diameter. Of a needle made and longitudinal traction control. For more reliable connection to the pylon uses simple lock of elastic steel wire with a diameter of 0.5 mm (as shown in the picture). Transverse thrust are cables, twisted from two to four (depending on the diameter) copper wires.
Wires coming from the motor, combined with transverse rods by soldering. Good cords (their length is 8 - 10 m) obtained from the telephone cable - you just take from a couple of isolated stranded provodnichkov. With transverse rods are connected by a loop or node, the electrical contact is ensured by soldering. After completion of wiring to connect the battery to the cordite-conductors, including the engine and measure the voltage across its terminals, as well as on the battery terminals.
Ideally, the voltage on the engine should be around 10 (remember, its operating voltage - 7.2 V). If the 12-volt battery does not provide such a strain, you should either increase the cross-wire cord, or switch to a more powerful battery. Wing tied up thin metallized Mylar film (with glue BF-2, BF-6, or "Moment" and using electric iron).
On the basis of this modell can be done with a larger version of the twin-engine thrust - a model can use more experienced "fighters" Piloting models - including the twin-engine options - no difficulties.
Model has to be run together: after the engine performs assistant stuffing tangent to the circumference of the flight. Pilotazhka site requires a diameter of about 20 meters Model quite confidently held in the air, performing with most maneuvers. To conduct air combat model-fixed paper strips about 3 m long