11/18/2023 0 Comments War thunder helicopters fawThe tail rotor (same as the main rotor) may encounter a vortex ring effect during hovering with high rotation speed when a helicopter spins around the main rotor axis (left or right) in the same direction as the tail rotor airflow. Tail rotor thrust depends on its blades pitch that is controlled by pedals. This can be compensated by, for example, slightly angling the main rotor axis or in other ways. The side effect of the control rotor is a side thrust, which tries to make a helicopter fly slightly sideways. The tail rotor is used to compensate reactive torque of the main rotor that tries to make a helicopter spin around in the direction opposite to that of the main rotor. Collective rotor pitch should be minimal in order to keep the main rotor speed high enough for control and landing. And finally after the engine failure the main rotor may still be rotated by the airflow. You should increase your horizontal speed to be able to pull out. Whilst flying at low horizontal speed with high descending speed (3 m/s or more) the main rotor encounters a vortex ring effect that results into a thrust loss and uncontrollable fall. ![]() Whilst flying above the surface at lower altitudes (comparative to the rotor diameter) there is a ground effect that increases the main rotor lift. To control the collective pitch you should use collective pitch stick - on the left of the pilot’s seat it moves vertically. Collective pitch is used to control ascending/descending, or to compensate for the vertical component of the main rotor lift whilst a helicopter is titled and moving forward/backward or left/right. By increasing the collective pitch, you increase the main rotor lift. The final angle of each blade, in each direction, is equal to a sum of angles created by a collective and cyclic pitch. ![]() So it doesn't depend on the direction on the rotor disc. The main rotor lift is controlled by the collective pitch that affects the angle of all blades in all directions on the rotor disc. The rotor cone tilt is possible because of the hinges that allow the blades to flap both horizontally and vertically, and rotate around their axes. Both of these factors create horizontal component of main rotor lift which allows a helicopter to move horizontally. The first one creates the momentum which tilts the helicopter, while the second tilts the rotor’s cone itself. Taking gyro precession into account, this means that in directions angled at 90 degrees from the directions with maximum and minimum cyclic pitch maximal and minimal lift is created as well as maximal and minimal rotor blades fly (up and down). When a cyclic-pitch lever is pointed in the given direction, it increases the angle of the rotor blades in one direction and reduces it in the opposite direction. It is controlled by a cyclic-pitch lever that is placed in front of the pilot. Rotor disc tilt is created by a swashplate that controls the cyclic pitch of the main rotor. How does a helicopter fly? Flight physics in War Thunder: So, in order to introduce helicopters that meet the requirements of our current physics engine we had to implement some new simulation elements: a rotor with moving blades and a swashplate, turboshaft engines with detailed transmissions, and other important flight control systems besides what we have already implemented for the planes. Additionally, we had planned to introduce many more rotary-wing machines than we did in A:AA. It was good enough for that ‘one time’ event, but to implement helicopters on a large scale in War Thunder, it didn’t really suit, since it did not allow us to reproduce the level of detail we already have for aerodynamics and damage models that we use for the planes in the game. During the April Fools event of 2017, we used the flight models from A:AA. Gaijin Entertainment already has experience in developing games with combat helicopters - back in 2010, we released Apache: Air Assault (A:AA), undoubtedly some of you are familiar with that game. ![]() ![]() You will learn how the helicopters will fly and what forces act upon them whilst doing so, and we will also show you how to control your heli in different game modes. In this devblog, we’d like to talk about the flight models and physics of these helicopters. Recently, we announced that combat helicopters will be coming to War Thunder in update 1.81 "The Valkyries".
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