Originally Posted by
barry lloyd
Yes, that was the basis of the question. I understand the radius of the props was 5.6 m (18 ft 4 in), so given some greater than normal ground clearance, bearing in mind the speed at which those propeller tips rotated, as a general scale, we must be looking at about 18ft or more.
A prop radius of 5.6m would be scary... a prop diameter of 5.6m is somewhat more likely.