With a 48" radius (8ft dia) prop and an air gap alternator it should be spinning at 5 mph. It may be that you have too much grease and if it has tapered roller bearings you may have pre loaded the bearings. Wait for a bit more wind and see what happens.

Things usually free off and start better after it has run for a while.

You will not know about the matching to the prop until it starts to make power so that is not an issue at this stage.

If there is a reasonable breeze and it still doesn't start then try disconnecting the rectifier ac leads if you can get at them.

I think that if you had made a connection error on the stator you would feel it when turning it by hand.

If it is on a temporary mount down among the trees you may not have the wind you think you have as it may be mostly turbulence.