Thanks elpirata,
That all makes a lot of sense. I thought that was the case with autos, but only found out recently. I gather the school I was at has now been told to do autos to the ground; I think this was due to something I said, all unknowing, in a conversation with someone from the CAA - long story. If I'm responsible I'm very pleased about it - should have happened long ago.
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Whirly
To fly is human, to hover, divine.