A good propeller is one that has properly shaped blades. A small but properly shaped propeller can already be very effective. A good and large one that is properly shaped can be several times more powerful, at the expense of load and heat.
If you change the propeller to one that has the same size and with a correct shape, you will observe an instant and visible speed improvement.
Metal propellers tend to be more solid. Some plastic propellers will flex or even deform underwater when the motor is too strong.
Normally, when looking from the back, the propeller (on a single prop system) should spin counterclockwise (a left prop) while pushing the boat forward.
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