I have been making propellers since 1980 in all shapes and sizes from small 2 blades at only 2ft diameter up to a 9ft diameter 4 blade one for the DH51 on display with the Shuttleworth Collection at Old Warden. See the picture below to show me standing beside it before covering.
Unfortunately I no longer make propellers due to other commitments in aeroplane restoration work although I still do the odd one if its interesting. The latest one is a new propeller for the Deperdussin at The Shuttleworth Collection, Old Warden. www.Shuttleworth.org