Re: Prop question: how can you tell pitch? Or if the hub is spun?

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Tom

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Replies: 636
Topics: 57
#74641

If you want to determine pitch, and can’t cross reference the numbers on the propellers, this should help:

https://www.youtube.com/watch?v=Uzv_m_Gm1es

Search around the site and print out the templates. Then measure as directed. I’ve used this method on known 40 hp OMC props and found it to be accurate to about 1/4" of pitch.

As far as determining whether a hub has spun: I’ve seen two spun hubs, both on 40 hp OMC props. In both cases, the hub and the prop were displaced enough that I could notice that the shear pin hole in the hub ended up too close to the propeller casting to get the pin out easily.

Tom