Provided the propeller is submerged low enough in the water, the most likely culprit would be a spun propeller hub. This condition causes the propeller to slip free from the hub, thereby causing the boat to lose propulsion.
This sounds like a classic case of a spun propeller hub. If when you throttle up, you can hear the engine rpm increase, but the boat speed drops off, then the propeller hub is suspect.
Propellers are measured in stations. This is done by first finding the propeller station number where the angle measurements are taken. Stations are measured in inches from the center of the propeller hub. As an example; propeller station 35 would be 35 inches from the center of the hub. The propeller maintenance manual and/or the Type Certificate Data Sheet for the specific propeller will provide the station number. Once you have located the proper station a propeller protractor is used to measure the angle. The protractor must first be "zeroed" (normally at the hub). Then the angle will be checked on the "Face" of the blade (this is the side that "faces" the pilot when sitting in the pilot seat). This must be done on each blade of the propeller to ensure they are all the same (or within limitations set by the manufacturer).
A Hub Means a portal couldn't u look it up in a diconary
1) Trailing edge 2) Face 3) Fillet area 4) Hub or Boss 5) Hub or Boss Cap 6) Leading edge 7) Back 8) Propeller shaft 9) Stern tube bearing 10) Stern tube
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.
Most likely a faulty propeller, especially if the "slippage" is more pronounced at higher rpm's. This would be indicative of a spun prop hub, (the rubber clutch surrounding the hub is loosing it's bond with the propeller). If this is the problem, you can either have the prop re-hubbed, or replace it with a new one.
The fadec sends a signal to the pcu which in turn ports oil through a beta tube into the cylinder to either the front or backside of the piston to move the blades. The piston is connected to a crosshead assembly inside the propeller hub which slides up and down with the piston to move the blades
1) keyed propeller and 2) keyless propeller................... they have further classificaton 1.fixed pitch propeller 2.controllable pitch propeller 3.directional pitch propeller
How do you build a propeller
A propeller airplane is, simply put, any airplane which uses a propeller for propulsion.
A propeller is a rotating wing.