Comparison WL Toys V931 vs WL Toys V911-Pro

Helicopter rotor(s) diameter. In fact, this parameter primarily determines the dimensions of the machine in the working position; this is especially true for three- and four-bladed models, where the propeller cannot be deployed along the fuselage, reducing the width of the space occupied (although the blades can be folded, which eliminates this drawback). Otherwise, the diameter of the rotor is of secondary importance: it is selected by the manufacturer in such a way as to provide features corresponding to the class of the machine, and it is worth focus primarily on the general purpose and price category of the helicopter, and not the size of the propeller.

The diameter of the tail rotor in machines of the classical scheme (see below). This parameter is of practical importance only in professional aircraft modeling sports, and even then quite rarely; relevant moments are described in special sources.

The number of blades provided in the design of the main rotor of a helicopter. When calculating this number, all rotors are taken into account — this means that in the coaxial circuit models (see above), the total number for both screws is indicated. Actually, in such machines 4 blades are used as standard — 2 per screw, there is usually no need for more; but in the classical scheme, this number can be different — from 2 to 3 — 8(technically, more is possible, but in fact this is rare).

The fewer blades provided in the design, the simpler and cheaper the screw (ceteris paribus), but the faster it must rotate in order to provide the necessary lift; this puts forward corresponding requirements to the engine. However, the number of blades is usually chosen by the manufacturer in such a way as to provide the machine with flight characteristics corresponding to the price and class. Therefore, this parameter can only be of practical importance for professional models designed for complex aerobatics; You can read more about this in special sources.

The presence in the design of the helicopter of a stabilization system in the form of a so-called servo axis (flybar) located on the axis of the main rotor (above it or below it). A spun flybar tends to keep the plane of rotation in one position, thus ensuring a stable position for the entire helicopter. This has a positive effect not only on resistance to wind gusts, but also on the quality of control: without a flybar, the helicopter would react too sharply to commands from the remote control, and with a stabilizer, control becomes soft, smooth and accessible even to beginners. On the other hand, the higher the stability, the lower the accuracy and responsiveness of the control; therefore, in professional flight machines, a flybar may be absent — its role in such cases is played by an electronic stabilization system.

The capacity of the battery supplied with the electric motor model (see "Motor"). Indicated only for variants using branded batteries (see "Battery type"), measured in ampere-hours: 1 Ah corresponds to the capacity at which the battery is capable of delivering a current of 1 A for 1 hour.

The higher the battery capacity, the more time the helicopter can spend in the air, usually. However, the practical time of operation on a charge is largely determined by other characteristics of the machine — dimensions and weight, engine model and power, etc. Therefore, in most cases, this parameter plays a purely reference role, and only helicopters that do not have any significant differences in other characteristics (and even then very approximately) can only be compared in terms of battery capacity.

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.

The type and number of batteries needed to operate the helicopter control panel.

— AA. Replaceable batteries, colloquially known as "AA batteries". They are available not only in the form of disposable batteries, but also in the form of rechargeable batteries, are produced under various brands that differ in price and quality (which provides freedom of choice), and finding such elements on the market is usually not a problem. The power and capacity of AA elements are relatively small, but in most cases they are quite enough for normal operation of the transmitter for quite a long time. Usually, modern remotes require several of these batteries — usually 2, 4 or 6.

— AAA. Also known as "pinky". In fact, a smaller version of popular AA elements (see above); has the same key features, but differs in more compact dimensions and, as a result, somewhat reduced power. This option is typical for low-cost class models, with a small range of the remote control.

The presence in the model of a special flight mode, designed to perform various aerobatic manoeuvres. In this mode, usually, stabilization systems are disabled, so that the helicopter can perform sharp bank turns, rolls, loops and other similar elements that are not available during normal flight. Note that this requires special care and precision in control: if in normal mode many control errors are corrected by stabilizing automation, then in acrobatic mode the helicopter accurately executes all operator commands, including incorrect ones.

This category includes radio-controlled models, the design of which copies the appearance of real-life helicopters — attack, transport, search and rescue, etc. Such a design, most often, does not affect the functionality, but it gives an additional resemblance to full-size machines. This is primarily appreciated by aviation fans, however, the use of copy models is not limited to purely aesthetic moments — they can also be useful for quite practical tasks (for example, imitation of a real helicopter when shooting a movie).