I made that Revell model when I was 7. Couldn’t read the instructions so things often required “innovation”. I miss those AC model kits.
I’d bet that when that cannon was fired, there is a jolt to the pilot and plane! I’d presume that prudence would dictate that only one at a time would be fired.
The name in that Stuka picture - Hans-Ulrich Rudel. He was one helluva pilot. Later in the war he flew a FW190. I read his book Stuka Pilot when I was a kid.
Wiki: Hans-Ulrich Rudel (2 July 1916 – 18 December 1982) was a Stuka dive-bomber pilot during World War II. The most highly decorated German serviceman of the war, Rudel was one of only 27 military men to be awarded the Knight’s Cross of the Iron Cross with Oak Leaves, Swords and Diamonds, and the only person to be awarded the Knight’s Cross of the Iron Cross with Golden Oak Leaves, Swords and Diamonds (Ritterkreuz des Eisernen Kreuzes mit goldenem Eichenlaub, Schwertern und Brillanten), Germany’s highest military decoration at the time.[Note 1]
Rudel flew 2,530 combat missions claiming a total of 2,000 targets destroyed; including 800 vehicles, 519 tanks, 150 artillery pieces, 70 landing craft, nine aircraft, four armored trains, several bridges, a destroyer, two cruisers, and the Soviet battleship Marat.[1]
Another pilot with artificial legs was Sir Douglas Bader, RAF. Bader lost both legs in a 1931 crash. He was restored to flying duty with the RAF after war began in September 1939. Bader fought in France and through the battle of Britain. He was shot down over France in April 1941 and captured. After several foiled escape attempts, he was sent to Colditz Castle for the duration of the war. Bader was liberated from Colditz Castle in April 1945. Bader was so dedicated to escaping captivity and rejoining the fight that his German captors had to lock up his artificial legs at night. Bader retired from the RAF in February 1946.