Leif is correct 1/FL will provide an adequate shutter speed for sharp fuselage with some prop blur. However Wheeler is also correct to reduce shutter speed to yield a desired prop blur BUT depending on experience this will dramatically effect the number of 'keepers' but one or two crackers are possible. I have developed a formula specifically to give a certain amount of prop blur as five bladed props do not require as much blur as a single blade to give the ultimate full disc.
Forumla :-
Shutter Speed = (60/rpm)/(360/bdeg)
Where
rpm = prop rpm allowing for any reduction gearbox
bdeg = desired prop blur in degrees i.e. 72 for five blade and 180 for single blade.
This may not be perfect and is subject to real-life experimentation but is certainly good for guidance.
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