The master list of GAL types (now closed for comment) wrongly states that the successor to the GAL56 series - the GAL61, was proner piloted. In fact the pilot was I believe seated conventionally but it was the observer who was prone.
Whilst I may have missed something obvious - very few words seem to have been published about the GAL61 which appeared at the 1948 Farnborough show but was never flown. It is the only other design to employ the spanwise, extending 'trafficator' drag rudder, used on the Horten H.VII, that I am aware of.
Can anyone cast some light on when design c=started and constyriuction began and was completed ? ands why was it never flown ?