Why do some planes have propellers in the back?

At takeoff, a canard pusher pilot does not have to apply rudder input to balance this moment. Efficiency can be gained by mounting a propeller behind the fuselage, because it re-energizes the boundary layer developed on the body, and reduces the form drag by keeping the flow attached to the fuselage.

Why are turbofan blades twisted?

Rotor blades for large wind turbines are always twisted. As you learned on the page on stall , a rotor blade will stop giving lift, if the blade is hit at an angle of attack which is too steep. Therefore, the rotor blade has to be twisted, so as to acheive an optimal angle of attack throughout the length of the blade.

Why are some propeller blades curved?

The curved shape of scimitar propellers helps to minimize the strength of the sonic shock wave formation, providing optimal performance at higher power and RPMs.

Why don’t planes have propellers in the back?

the engines are used for propulsion thrust. its turbulant flow behind engines creates a drag causing it to reduce its speed if it were in the front. also it makes ships to steer the ship easier if its at the rear instead of middle or front with the help of tail or diverter.

Why blades are tapered and twisted?

In the most of the application the rotor blades are tapered from hub to tip. This reduces the weight of the peripheral portions of the blade and hence the hub stress, which must be carried under the high rotational speeds, will be reduced [1].

Why are wind turbine blades curved?

Generally, wind turbine blades are shaped to generate the maximum power from the wind at the minimum construction cost. Its believed that by slightly curving the turbine blade, they’re able to capture 5 to 10 percent more wind energy and operate more efficiently in areas that have typically lower wind speeds.

Why do scimitar propellers have such a high blade count?

That scimitar propellers have a high blade count is a result of their high operating speed: To keep the tip Mach number low, the diameter must be limited which increases the load on the single blade. Flying fast needs a lot of thrust, so the activity factor(power absorbed by the propeller per blade area) is high.

How do propeller blades affect the flow of air?

In so doing, the angle of attack of the blades increases allowing the blades to impart greater energy to the air flow. Increase the diameter of the propeller disk, i.e. make the blades longer. The blades will therefore transfer more energy by affecting a larger volume of air.

Are scimitar blades better for fuel efficiency than straight blades?

Propeller design plays a key role in the fuel efficiency of an aircraft. With their enhanced aerodynamic design, scimitar blades may improve efficiency over conventional straight blades, potentially helping pilots save on flying costs.

What is the maximum number of blades on a prop?

The maximum number of blades ever used on a propeller is probably eight. The reason propeller design varies so is most often related to the power produced by the engine in question–more powerful engines require more propeller blades. Tupolev Tu-114 with some of the most powerful turporop engines ever built

https://www.youtube.com/watch?v=oUGb97KnU_Q