http://lepah55qyp2fhuwxlz7bwrhzckn4gkuofivnofoeuyfpmke5x2hq.b32.i2p/archive/wintringham/1930/12/x01.htm
, that in recovering from “ a bad angle ” (a steep tilt upwards or downwards) the vessel will rise or fall 200 feet, or 600 feet or more, according to speed, gustiness of the wind, original angle of flight