Operating time
Operating time of an electric powered helicopter (see "Engine") on one battery charge or on one set of batteries. This parameter is rather conditional and approximate: it is usually indicated for optimal operating conditions, with a uniform low load on the engine (most often for hover mode), and when using replaceable cells — for high quality batteries. Accordingly, in fact, the operating time may differ markedly from that stated in the specifications. Nevertheless, this indicator quite reliably describes the battery life of the car, and different models can be compared according to it.
Frame
The frame is the base of the helicopter; it is on it that the engine, mechanisms, electronics and body are installed. It may have the following structure:
— Team. This category includes frames consisting of separate parts on detachable joints — for example, bolts. Other things being equal, they are considered less reliable than solid ones, because. connections are usually the "weak point" of the design; however, for simple flights, this reliability is quite enough, and prefabricated frames are somewhat cheaper. This option is found mainly in entry-level models, as well as in inexpensive middle-class cars.
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Whole. A frame that does not have collapsible joints and is made in the form of an integral structure. Theoretically, this option is able to provide high strength, making it suitable even for professional-level machines. However, in fact, a one-piece frame in itself is not an indicator of a high class model — it is found among helicopters of all price categories, and the quality of the structure, usually, directly depends on the cost.
Material
The material used for the body of the helicopter.
The case, usually, is an external casing that covers the frame with the equipment installed on it (in whole or in part). It plays a decorative role, and also provides the necessary balance and aerodynamics of the model. High strength is not required for such a casing, since even during difficult piloting the loads on it are minimal, and accidental cracks, chips and other damage are not critical for the machine's performance.
In light of all this, plastic has become the most popular material for radio-controlled helicopter bodies. This material can easily be given almost any shape and coloring, while it is lightweight and inexpensive. Of the shortcomings, one can only note the susceptibility to scratches, but this moment mainly affects the appearance of the car, and not its flight qualities. Plastic is common among all categories of helicopters, from low-cost to professional.
Another option found in modern models is Lexan. This material is in many ways similar to plastic, but much more durable and wear-resistant. On the other hand, it costs accordingly, and therefore is used mainly in cars of the middle and higher price range.
Dimensions (LxWxH)
General dimensions of the model. Note that the length and width are indicated only for the fuselage, excluding the main rotor. However, for ease of transportation, the blades are often made removable or folding.
