prop size and pitch will make a difference, not number of blades.

Not knowing what the torque of the motor is at the given RPM's but lets pretend that your motor has enough torque to drive a bigger prop.

For instance if you have a 10 inch prop now and want a little more speed you may go with a 11 inch prop at the same pitch. Or...

If you want to keep the same size prop and want more speed you can get a 10 inch prop with a bigger pitch that will provide more pull.

e.g. 10X7 prop. 10 is the size in inches and the 7 is the pitch. want more speed go with 11X7 or 10X8 props.

NOTE: bigger prop and steaper pitch mean more resistance for the motor. The motor rpm will drop slightly unless your motor has enough torque to drive the prop.

I know this sounds a little jumble but it is midnight......

Hope this helps