1. B-17 Flying Fortress
   P-51 Mustang
2. Messerschmitt Bf 109E

The German Messerschmitt Bf 109 was one of the most successful planes in the early parts of the war. This liquid-cooled V12 engine could push the plane to altitudes of nearly 15,000 feet.

1. Christmas Bullet
   Supermarine Spitfire
2. A6M Zero

The Supermarine Spitfire is one of the most iconic fighters of the war, a critical weapon during the Battle of Britain. Many versions used the Merlin engine, which could generate up to around 1,000hp.

1. 1
   4
2. 16

The B-29 was a technological marvel of WWII, armed to the teeth and brimming with power thanks to four prop-driven engines. The engines, however, were not always up to snuff.

1. They randomly exploded in hangars.
   They weren't very reliable.
2. Most of them fell off of the plane at takeoff.

Considering the size and heft of the B-29, the plane really needed solid engines. Unfortunately, many of the early versions of the R-3350 weren't very dependable, leading to some tragic consequences.

1. Kawasaki Ha-40
   Daimler-Benz DB 601
2. Allison V-1710

The first design of the P-51 Mustang was meant to use the Allison V-1710. But the Allies soon realized that the plane would perform better with a different motor.

1. Argus As 402
   Packard V-1650
2. Hirth HM 512

The Packard V-1650 Merlin was a version of the famous Merlin engine made in Britain. This one, however, was built in the United States by the Packard Motor Car Company.

1. B-17
   Zero
2. Spitfire

The A6M3 Type 0 Model 32 was a common engine in the Japanese Zero fighter. Japan started production of this engine in 1942 and used it extensively against the United States.

1. China
   Japan
2. USSR

Until after the end of the war, the Soviet Union produced incredible numbers of the Shvetsov M-11, a five-cylinder radial engine. In total, about 100,000 of the M-11 were built for a variety of aircraft -- mostly civilian planes.

1. 50hp
   750hp
2. 5000hp

Each of the four R-1690 engines generated about 750hp. At full speed, the engines propelled these large bombers to a speed of around 250 mph.

1. Kerosene
   Radial
2. Jet

The R-1830 Twin Wasp was a 14-cylinder radial engine used in the '30s and '40s. It was exceedingly common and built into two of the most numerous aircraft models (DC-3 and B-24) ever built.

1. Rolls-Royce Merlin
   Diesel HEMI
2. Shvetsov M-11

It's fitting that one of America's most iconic fighters was actually powered by a Rolls-Royce Merlin, the same engine that made Britain's Spitfire such a powerful weapon in the epic Battle of Berlin. The Merlin boosted the P-51's capabilities, particularly at high altitudes, making it much deadlier against German fighters.

1. China
   Britain
2. Liechtenstein

In the late '30s, Britain was getting serious about aircraft engines, and the Napier Sabre was definitely a step in the right direction. It was one of the most powerful engines of the era, with some later models generating more than 3,000hp.

1. They were literally bulletproof.
   They were both high-powered.
2. They burst into flames instantly after being struck by shrapnel.

Both the Sabre and the Vulture were exceptionally high-powered engines during the WWII era. They were both meant to top 2,000 horsepower.

1. True
2. False

The BMW 801 was a 14-cylinder radial engine built by the tens of thousands, and it was ultimately implemented into planes like the Focke-Wulf Fw 190. But it relied on air to keep heat levels under control -- it was not liquid-cooled.

1. Propeller
   Rocket
2. Slaves

The Me 163 was an incredible rocket plane that the Germans introduced in 1944. It's still the only rocket-powered fighter ever used in combat and could top speeds of 1,000 mph.

1. Curtiss
   Pratt & Whitney
2. Honda

Pratt & Whitney engineered the R-1830 Twin Wasp, which was used in countless Allied warplanes. It may actually be the most-manufactured plane engine in the history of the world.

1. 55hp
   2,000hp
2. 10,000hp

Both the Allies and Axis pushed horsepower ratings in order to build planes that could reach ever greater altitudes. At the time the war started, many engines were pushing 2,000hp.

1. Hamsters
   Jet engines
2. Extreme fear

The German Me 262 was the first-ever jet fighter made ready for combat. Its turbojet engines meant it could zip to about 530 mph, making it a high-speed target for Allied foes, who countered the plane's speed by blasting it during takeoff and landing.

1. True
2. False

Both the older Hurricane and newer Spitfire both used variants of the legendary Merlin engine, which provided fantastic power and speed even at higher altitudes, a critical point when battling sophisticated German planes.

1. Merlin III
   Merlin 45
2. Merlin 666

If the Nazis had built the Merlin, there definitely would have been a variant called the 666. As it was, there numerous models of the engine built from the III to the 45 to the XX and a lot more.

1. 2
   12
2. 26

The BMW VI was a common V12 engine that found its way into numerous German aircraft during the war. The Japanese and Soviets used identical versions in some of their planes, too.

1. Gandalf
   PV-12
2. Crumpet 5000

The Merlin was originally given a bland moniker of PV-12. But then the company got wise to marketing and realized that naming its engines after birds of prey would be way cooler.

1. They were so heavy that they cause wing failure.
   New engine technologies emerged.
2. The British were just tired of making so much stuff.

Sure, the Sabre was an amazingly powerful engine, but it was by no means cheap to build. Plus, at the end of the war, a new type of technology -- jet power -- was emerging.

1. Flying tanks
   Transports
2. Bombers

The Mitsubishi MK4E engine was built into the G4M, a common bomber used in the Pacific theater. These engines had large superchargers to help the G4M attack its targets.

1. Fighters
   Transport
2. Bombers

The Jumo 211 was a V12 that saw use mostly in German bombers like the Ju 88. The Germans produced tens of thousands of these engines during the conflict.

1. It never even got off of the ground.
   It was fantastic.
2. It made an easy target.

The Fairey Battle did indeed use the amazing Merlin engine, but the plane itself was much heftier than other aircraft, and it was an easy target for the Nazis. It was shot down in droves before the British wised up.

1. About 100hp
   About 50hp
2. About 10,000hp

The Shvetsov M-11 was a smaller engine used in little aircraft. It had a horsepower rating of around 100hp.

1. Ram jet
   Piston
2. Rocket

The Mikulin AM-35 was a type of piston airplane engine made by the Soviets starting in 1940. It was used to power the Ilyushin Il-2, one of the most common Soviet ground-attack aircraft of the war.

1. True
2. False

The He 178 really was the first aircraft to soar through the skies using turbojet technology, but it was only able to endure the strain of combat for 10 minutes at a time. That kind of jet fighter technology wasn't ready for prime time until well after the war ended.