To counteract the the right hand tourque produced by the clockwise rotating engine
No. Gliders, jets and rocket-propelled aircraft do not have propellers.
Aircraft propellers
You can make propellers spin in opposite directions by using a differential thrust system, where one motor spins in the opposite direction of the other. This can be achieved by programming the motors on a drone or aircraft to rotate in opposite directions, resulting in counteracting torques that cause the propellers to spin in opposite directions.
For an aircraft to stay aloft, the an air current has to move over the wings in a specific way. The propellers generate the air current and direct it in the proper way to keep the aircraft airborne.
The Helios is the aircraft with the most engines. This was an unmanned electric aircraft with 14 engines with propellers.
I doubt it. I have seen thousands of Cessna and they all appear to have alloy propellers
No, that is not possible except with rotors. (which I would include among propellers)
Propellers are typically used in smaller aircraft and boats, while turbines are used in larger aircraft and power plants. Propellers have blades that rotate around a central axis to generate thrust, while turbines have blades that are turned by a fluid or gas to generate power. Turbines are more efficient at higher speeds and altitudes, while propellers are better suited for lower speeds and altitudes.
Fixed pitch propellers are simpler, lighter, and more cost-effective than variable pitch propellers. They are also easier to maintain and operate, making them a popular choice for smaller aircraft.
Aircraft, birds, bats, propellers.
Aircraft do have propellers , unless they are jets.
They propel the aircraft by propellers or jet thrust.