The micro-model is a leisure which is similar to models and dedicated to the design, manufacture and control of models very small. The most accomplished objects have a mass not exceeding a few grams and measure only a few centimeters in length. Often, micro-models are the objects that can fit in one hand and have a motor system that allows them to move independently. Micro-modeling is therefore distinguished in this sense models , which remain static.
Unlike the models, whose goal is to reproduce as faithfully as possible all the details of an object (usually a means of transport) without it being able to move by its own means (with the exception of the model boats) , micro-modeling emphasizes the actual operation of the device.
There are usually three types of control:
- Wired link control;
- The remote infrared;
- The radio remote control, or radio remote control .
The wired command
The device is connected to its control device by a wired connection (wire guidance). This mode of control tends to disappear more and more, because the presence of the thread prevents the realization of many figures.
The infrared remote control
This mode of remote control is particular to the interior flight ( indoor ) and the reach can reach the length of a gymnasium ( 30 m ), which is largely sufficient for a micro-plane of 3 g and 15 cm of wingspan (limit visibility).
- The infrared transmitter
Here is an amateur construction transmitter. It consists of an electronic circuit with a microcontroller , a joystick and a Li-Po battery of two elements:
This receiver is large enough to be made by a non-specialist. we will notice the microcontroller which is a PIC10F200. Most components are very easy to find in France, they are all CMS , whose advantage is the small size and the very reduced weight.
The components are welded on the circuit, we will notice the infrared sensor on the left.
The radio control
The radio remote control is by far the most sophisticated control mode and best suited to micro-modeling. It operates on a variety of frequencies , but it is necessary to ensure that no other micro-model or model reduces use the same frequency, otherwise conflicts may occur to create incidents or accidents.
Micro-modeling in aviation
Aviation micro-model is still called micro-aviation. Of all the disciplines of micro-modeling, it is micro-aviation that provides the most spectacular effects and the biggest “challenges”.
There are three categories of micro-aviations:
We find the replicas of the following helicopters 1 :
- The Hughes 300 FAIRY Micro: a 2 axes which allows, by its microscopic size and flight stability, to evolve in the smallest spaces. The design is particularly successful;
- Boeing CH-47 Chinook 2-Axis R / C Micro Helicopter : Pretty replica of the Boeing CH-47 Chinook. This micro-helicopter is a 2-axis (up / down, left / right). Its gyroscopic system in flight gives it a perfect stability;
- Microhelicopter R / C 2 axis such Picoo Z : The smallest and lightest R / C helicopter in the world ( 17 cm long, weighing less than 10 g ). Helicopter very stable thanks to its new patented gyroscopic system;
- Microhelicopter R / C 3 axes AMAZING MICRO 3D APACHE: A 3-axis (up / down, left / right rotation, translation forward / backward). This is a model mainly for indoor flights.
We find the following aircraft 2 :
- Micro Plane R / C twin- axle : With its 6.8 grams , it allows its microscopic size and slow flight to evolve in the smallest spaces. Virtually unbreakable, it is suitable for the youngest;
- Micro plane ” Mini Bee Plane ” 2 axes : Twin-engine aircraft very lively. In indoor or outdoor flight without wind, it is able to evolve in the smallest spaces. 2-axis control by differential action of the two motors.
Mini- gliders are gliders equipped with an electric motor . They usually have sufficient spans to make it possible to shut down the engine at altitude and to continue the gliding flight 3 :
- Mini 3-axis glider R / C glider: 107 cm wingspan, range of 300 meters ;
- Mini Flyglider Easy fly R / C AIRPLANE 2 axes : 105 cm wingspan, range of 150 meters ;
- Mini Humming R / C motorglider 2 axes: 94 cm wingspan, range of 150 meters ;
- Orange R / C mini sailplane 2 axes: 155 cm wingspan, 500 meters range .
Micro-aircraft R / C scale “pistachio”
The “pistachio” scale (a plane whose wingspan does not exceed 20 cm , or 8 inches ) is an already known category in free flight with elastic propulsion. We have here to make models with electric propulsion and remote control in infrared.
This BD4 pistachio scale has a wingspan of 20 cm for a weight weight of 4 g . It is powered by a motor Didel MK04S-10 4 x 8 mm Pager 10 ohms . The remote control is amateur built according to a scheme by K. Tanaka. The plan is from Andy Mitas.
The bottom of the model is generally not touched, to allow an easier access to the electronics (the winding wires are 0.03 mm !). We notice at the top the Pager engine and its reducer. Further down to the empennage is the Li-Po battery on which the infrared receiver is glued.
This model of the Piper Vagabond (in) has its plan published in a review of Bill Hannan. The fuselage is lined with Japan Esaki paper . The wings are covered with mylar and colored yellow with an airbrush. The registrations are made with decals in mylar support .
This micro-plane is a model of inspiration “golden age” aviation. The Pietenpol Air Camper (in) was one of the first aircraft homebuilt aircraft (1928). The fuselage is lined with capacitor paper and the wings are covered with mylar passed to the painting “old canvas” using an airbrush . We see the receiver and the battery glued under the fuselage.
It is a model really easy to achieve and a safe and enjoyable flight. For once, the engine is almost completely concealed by the hood. The white propeller is of personal construction, from a plastic cup.
Notes and references
- ↑ ” RC Helicopters ” [ archive ] , Micro-aviation (accessed January 25, 2017 )
- ↑ ” Micro-RC planes ” [ archive ] , Micro-aviation (accessed January 25, 2017 )
- ↑ ” Mini RC motorgliders ” [ archive ] , Micro-aviation (accessed January 25, 2017 )