SPUN PROP? C'mon maaaan 1961 10hp

While operating at full throttle yesterday, my '61 evinrude 10hp sportwin suddenly revved up and i lost power, so i throttled down (expecting cavitation) but each time i powered up, the motor screamed but with minimal power. It would still go but no power. Lower unit is all new and oil was clean. Now heres the Q's: Is the brass part inside of my prop separate from the prop itself? I thought that the shear pin protected the prop from damage, but theres actually 2 lines of defense here? I locked it in gear and could not turn the prop. I pulled off the prop and it looks fine. would'nt the shear pin go before the prop??? whats happening here? any help appreciated

Re: SPUN PROP? C'mon maaaan

Prop is aluminum and hub is brass / bronze------so yes it does have a rubber drive in there.-----------You can mark the prop and see if the marks shift.----------------If you think the prop is fine , then remove the lower unit and inspect drive splines at the top of the the shaft. If that is ok then something broke in the lower unit.

Also keep in mind its gonna take allot of torque to imitate a spun hub.