Thanked 1,095 Times in 242 Posts

Thanked 1,095 Times in 242 Posts
Propeller mechanism that directly or by reduction system (reduction gear) connected to the crankshaft and rotates Bvslh the relatively large mass of air resulting in accelerated and drove them back, and according to Newton's Third Law reaction resulting from the increased speed Air Force that is driven propeller and the propeller thrust (Thrust) pools say, in other words bhp engine propeller true power of the Force turned Thrust and push the plane forward .ml completed the locusts in the air like a Screw in one body, so it is also called airscreew. Propeller mechanism may consist of two, three, four, or five blades are formed, number of blades, length, width and angle depends on the engine power, the engine power is greater than the length, width and angle of the blade more and more would be to allow the engine's power to capture and convert the thrust propeller shaft .tyghh or connected by HUB to Mylng. Grasshoppers are made proportional to the engine power at low engine pools powers two-blade propellers pools are made of wood or aluminum alloy one-piece or two-piece and the propeller engines Bold and the strength of aluminum alloy, solid and powerful engine propeller blade Azalyazh steel blades are hollow and more. AIRFOIL cross blades as aircraft wings, pools and so all the definitions and rules as aerodynamic wings on the blade applies Thus, each blade leading edge, trailing edge, and the hypotenuse has a curved portion of the propeller camber side And part of it (face) is flat when the propeller spins the disk of the propeller's spinning propeller (palne of rotation) call. Grasshoppers and efficiency of the piston engine, or Tvrbvmlkhy flying craft or helicopters, propeller using the power of the engine, the driving force is generated. The spinning propeller wings. pools Wing of the plane on the move, lift and drag forces generated, and the propeller is rotating the same two forces will produce. To force the wing upward pools (perpendicular to the direction of motion), but the force of the propeller to the front (vertical takeoff rotation), and accordingly the driving force or driving force say. The propeller through the air displacement with increasing speed and reducing the pressure on. Locust-like wings with airfoil cross-section, mounting angle, pools torsion angle, pools diameter, chord, etc.. As the propeller rotates, the air velocity at different sections of the same grasshopper edge, in other words, the air velocity at the leading edge of the propeller blade root is very low and the velocity of air at the leading edge tip of the propeller, the speed of a little less sound. For reasons of structural pools and aerodynamic pools blade angle of attack is the angle of attack at the tip of their lower roots, as well as smaller blade chord at the root. Fusiform-shaped cross section of the blade to generate the pressure difference, generate forward propulsion. In general air displaced by each blade propeller, pools called Q, the flow rate is equal to the product of air velocity and propeller drive cross sections, namely: Q = VA = V (ПD ^ 2) / 4 where D is the diameter of the propeller It is. Note that the total air flow rate through the propeller is equal to the sum of the air flow through the fins. The amount of air flow on many factors including the speed of rotation of the propeller and propeller blade section aerodynamic characteristics depend. For Tshryh performance of each propeller Tuesday pools diagram of which include curve forward propulsion CT in front of the advancing curve power coefficient CP in front of the advancing curve torque ratio CL in front of the advancing blade angle Angel of blade angle is the hypotenuse This angle makes the blade's direction of rotation or in some grasshoppers fixed and variable in others .. Angle of attack Angle of attack angle that the chord of the blade with the blade of dealing with the relative wind weather makes. A: Angle blade angle of blade β: angle of attack, pools angle of attack AB: aerial collision-induced rotational speed of the propeller CA: clash of the velocity pools vector air plane CB: Aerial deal according to Figure 1, the following results are obtained: 1. If for any reason an aircraft in flight, the aircraft speed increases but the propeller blade angle remains constant (the vector CA is high but constant AB) aircraft to Dive eg in front of severe pools wind, or the angle of attack β regresses that to where it may be zero or even negative, in which case the air propeller that moves but does not speed up or slow down the result, instead of Thrust, drag produce. 2-If the propeller blade angle is high and constant air velocity (the vector AB is high but constant pools CA) angle of attack is high, such as during takeoff and the rise of a maximum of the angle of attack increases pools β .lza for imprimis Grasshopper The efficiency of the engine during the come up and have a maximum RPM of the propeller low pitch and put it in cruise flight, the propeller rpm is low and quickly pools put the situation pools in both cases, the locusts High pitch best angle of attack of Thrust and efficiency is highest. Note: The angle of the propeller blade from root to tip to tip deflection is reduced, ie the propeller from Root to stay Thrust during the same blade root to the tip of the blades are enumerated. pools Different parts of the propeller 1-blade shank: the blade closest to the Hub to say. 2-blade tip: the farthest part of the Hub to say. 3-HUB bore: the part that allows the propeller pools to the engine crank shaft attached. 4-Blade back: the curved propeller 5-Blade face: Smooth grasshopper. Step by Step propeller propeller propeller pitch is the distance that the propeller-driven for a distance pools equal to the