The photo from the book Vultee Aircraft 1932-1947, Jonathan Thompson, shows the prototype aircraft of the series that became the Valiant, the Vultee Model 54 with retractable undercarriage seen flying on test.

Самолёты на фотографии: Aircrafts on the photo: Vultee Valiant / BT-13 / SNV - СШАUSA - 1939

A photo from Jack Meaden's collection of a Morane Saulnier-built DH60M Moth (either F-AJOC or F-AJQC) being used to demonstrate the "Bemberg Stabiliser" which looks like fans attached to the wing struts - does anyone know anything about this device please?

Самолёты на фотографии: Aircrafts on the photo: De Havilland Gipsy Moth / Moth X - ВеликобританияUnited Kingdom - 1928