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

Home Forum Ask A Member Prop question: how can you tell pitch? Or if the hub is spun? Re: Prop question: how can you tell pitch? Or if the hub is spun?


nj-boatbuilder57


Replies: 286
Topics: 41
#74642
quote paulfromYork:

I am not familiar with “spun hub”. Is there a slip mechanism in the hub??? I know about shear pins ;>) Can anyone enlighten?

In these props, the bronze "tube" in the center of the prop (that goes over the shaft on the engine) is not rigidly connected to the actual propeller……there’s a rubber hub in between. I believe it’s there primarily as a shock absorber.

As I understand it, if a prop hits something hard, the rubber hub will loosen itself from the prop rather than break the prop blade. However, on the workbench, it can be difficult to tell if a hub is in tact or not. A "good looking" prop can reveal itself to have a bad hub when you accelerate: the engine revs up, but the prop slips, as 49morphew stated in post #2.