 <unk> by the late delivery of its propeller , the first prototype was rolled out at Brough in February 1947 and then taken by road to RAF <unk> where it made its maiden flight on 1 April that year . All three prototypes were completed by the end of September and the third prototype had been modified to reduce the outer @-@ wing dihedral to 3 degrees . Both the second and third prototypes remained <unk> when the Ministry of Supply ordered that flying be ceased and work on the aircraft be stopped . Later in the month , however , the third prototype was allocated to tests of powered <unk> controls , as testing of the first prototype had shown that while adequate at cruise speed , the ailerons were heavy both at low and high speed . The second prototype was allocated to structural testing . 
