Twin-engined german bomber in the battle of britainTwin-engined German bomber in the Battle of Britain
North american single - engine long - range fightersNorth American single - engine long - range fighters
Soviet single-engine fighter at the airfield after the battleSoviet single-engine fighter at the airfield after the battle
American armored, single-seat, twin-engine thunderbolt attack aircraft in flightAmerican armored, single-seat, twin-engine Thunderbolt attack aircraft in flight
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