this is an easy to use prop wizard. lots of factors/options you can input. i had a spun prop and decided to buy a new aluminum one as a backup. i did the prop wizard and got the Hustler prop model number. Found it for $42 on walmart.com and the hub was $21 (lifetime guarantee on the hub).
Even if you don't buy their props, it can tell you blades, pitch, diameter, etc.
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