OK here's an odd question...

Just how important is the size of a spinner?

Point in fact - a local flier increased his spinner from 2.25" to 2.75" and the plane is now noticeably quieter.

I like to used aluminium prop nuts that are 'Bullet Shaped' - could I improve the efficiency of my engine by changing to a 2.5" Plastic Spinner?

Is There a 'Science' to Spinners?

OR .

Are they Just to look pretty? []