wiEngineer,

You mentioned props. Here's a quick primer.

11X7:
11 = diameter (in inches) equals "torque" or pulling power, especially vertical pull.
7 = pitch (also in inches) equals speed. Theoretically, 7" pitch will pull the plane forward 7 inches for every revolution.

General rule of thumb: If you increase diameter by an inch, you decrease pitch by an inch (to prevent taxing the engine), and vice versa. (Reducing Dia. nd pitch will increase RPM, sometimes beyond peak efficiency. Similarly, increasing both will reduce RPM, sometimes with like effect.)

The OS 46LA is not known to be a powerhouse, so the 11X5 recommendation may be a good one, especially for break in. You want a prop in the lower end of the manufacturer's recommended range for break in anyway.

I have a well broken in 46LA and it handles an 11X7 pretty well.

Sounds like you're making good progress, and you've had some terrific advice. Keep us posted!
Dennis-