Spinner size for the Funtana 90 is 2 & 3/4". The best prop I have seen for that plane engine combo is the APC 16X4 and unfortunatly, no one I know of makes a 2&3/4 inch spinner that is pre-cut for that prop. As I said, Tru-turn will do it for you but it is pricey. I cut mine myself with the handy-dandy dremel.