ORIGINAL: johncdh
Is a 13-4 to little prop for a Magnum 61RFS?, all of the charts I have seen recommend a 13-5 6 or 7. I am looking for a good pulling prop and not interested in speed (excessive speed). The engine is on a U-Can-Do 46.
Go to a 14-4. A 13-4 is not enough prop based on what you listed above as recommended props. If you want to have good thrust and lower speed, take a recommended prop and increase the diameter and lower the pitch.
For example, 13-5 --> 14-4.