Propeller FAQs:

Q: Is a propeller a type of fan that transmits power by converting rotational motion into thrust?

A: Yes.

Q: Is a propeller most common on ships such as tugs where there can be enormous differences in propeller loading when towing compared to running free?

A: Yes, and a change which could cause conventional propellers to lock up as insufficient torque is generated.

Q: Is a propeller made up of sections of helicoidal surfaces which act together 'screwing' through the water?

A: Yes, Three, four, or five blades are most common in marine propellers, although designs which are intended to operate at reduced noise will have more blades.

Q: Is a propeller removed?

A: Yes, and the splined tube can be cut away with a grinder and a new spline bushing is then required.

Q: Is a propeller swept back against the direction of rotation?

A: Yes.

Q: Was a propeller the extension of that arc through more than 360° by attaching the blade to a rotating shaft?

A: Yes.

Q: Is a propeller put under a load that could damage the engine?

A: Yes.

Q: Is a propeller the controllable-pitch propeller?

A: Yes.

Q: Is a propeller used in sculling?

A: Yes.

Q: Is a propeller a "frozen-on" spline bushing?

A: Yes, and which makes propeller removal impossible.

Q: Is a propeller the most common propulsor on ships?

A: Yes, and imparting momentum to a fluid which causes a force to act on the ship.

Q: Are propellers pioneered by the Wright brothers?

A: Yes.

Q: Is a propeller a propeller that turns around the vertical axis?

A: Yes.

Q: Is a propeller added to a ship its performance is altered?

A: Yes, there is the mechanical losses in the transmission of power; a general increase in total resistance; and the hull also impedes and renders non-uniform the flow through the propeller.

Q: Is a propeller operating and gravity?

A: Yes.

Q: Is a propeller overloaded?

A: Yes.

Q: Is a propeller essentially the same as a wing?

A: Yes, and were able to use data from their earlier wind tunnel experiments on wings.

Q: Is a propeller exposed to the risk of collision with heavy objects, the propeller often includes a device that is designed to fail when overloaded?

A: Yes, the device or the whole propeller is sacrificed so that the more expensive transmission and engine are not damaged.

Q: Is a propeller operating at a very high speed?

A: Yes.

Q: Is a propeller operating at high rotational speeds or under heavy load?

A: Yes, The pressure on the upstream surface of the blade can drop below the vapor pressure of the water, resulting in the formation of a vapor pocket.

Q: Is a propeller modelled as an infinitely thin disc?

A: Yes, and inducing a constant velocity along the axis of rotation.