Propellers can have any number from 2 -8 or so blades.
Cloud Model
A propeller is like a spinning wing. The airfoil shaped blades pull an airplane forward just as an airplane's wings lift it upward. The amount of thrust created by a propeller depends on how fast and at what angle its blades cut through the air. The propeller is generally powered by a combustion engine which fires pistons and turns the propeller.
A helicopter has rotor blades and an airplane does not.
Drag if friend and foe of aircraft. it is created by wing flaps or feathering of propeller blades.
Yes. Propeller blades are much like the wings of an airplane. On a propeller the airfoil chord, twist and camber are change drastically from root to tip - more than on a wing.
It's the engine that makes the propeller go fast, not the number of blades.
The propeller blades are angled in the opposite direction, sort of like an airplane flying on its back. Of course, the propeller's blade twist from hub to tip is inappropriate, and the camber of the airfoil is wrong when thrust is reversing, but efficiency of the propeller is not of paramount importance during that phase of operation.
In production the different models came with 3, 4 or 5 blade propellers of different manufacturers.
Barrel Assembly
The rotor is like the engine to the propeller. A propeller is the fan like blades on the top that spin to make the helicopter fly.
"Lavat" is not a commonly recognized term in English. It could be a misspelling or a term from a specific language or context. Can you provide more context or clarify the term so I can offer a more precise explanation?
A propeller works by converting the rotation of the engine into horizontal thrust similar to a fan. The blades push the air backwards creating acceleration, and create a difference in pressure between the forward and rear surface adding to the movement. The above is, of course true for a boat propeller. For an airplane propeller Bernoulli's pincipal is involved. Bernoulli's principle states that the greater the speed of a fluid, the less the lateral pressure. So the propeller uses the same deal as the wing.