Twin-engined german bomber in the battle of britainTwin-engined German bomber in the Battle of Britain
Soviet single-engine fighter at the airfield after the battleSoviet single-engine fighter at the airfield after the battle
Drawing of the soviet ant-25 single-engine aircraft in the skyDrawing of the Soviet ANT-25 single-engine aircraft in the sky
Soviet single-engine fighter in the air with the enemySoviet single-engine fighter in the air with the enemy
Using a protractor by an engineer in the old schoolUsing a protractor by an engineer in the old school