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Propeller size

charlie
 

I have a 54 inch 3 blade on my Q1 with generous clearance.
But mine is not built strictly to the plans. For one we used the Lamb tires that were available at the time, these are 4.80 on 5 inch if I recall mounted on nylon rims. There are changes to the incidence and if I recall a slight increase to the anhedral on the canard, the tires and anhedral as well as the gear drive on the 447 raise the propeller a fair bit over the original build with the Onan.
Charlie N