Whirls - I note that you come from this lads territory! Are you of sound mind?
Bishop Bonner who is said to have been the man responsible for burning over two hundred heretics ...
I like the idea of looking at your shadow, but as you said not hugely practical in the summer, nor on a boat nor if you cannot see directly underneath the aircraft!! Also one should always remember that the main rotor is much better at clearing small trees than the tail rotor................