Rotary engines have far fewer moving parts than conventional piston engines and run a lot smoother. See how much you know about these internal combustion engines by taking this quiz.
Who patented the first rotary engine?
- Walter Hancock
- Ferdinand Verbiest
- Felix Millet
How many cylinders did Millet's engine have?
What year was the first rotary engine patented?
During which war were rotary engines used in many airplanes?
- World War I
- World War II
- Korean War
Wankel rotary engines are also sometimes called what?
- camless rotary engines
- pistonless rotary engines
- cylinderless rotary engines
What is the best trait of a Wankel rotary engine?
- fantastic fuel efficiency
- superb power-to-weight ratio
- low oil requirements
Wankel engines are named for their inventor.
What major drawback did rotary engines present to novice pilots?
- visibility issues
- stability problems
- spontaneous explosion
True or false: Wankel rotary engines use the same combustion cycle as four-stroke piston engines.
What was the primary advantage of the first rotary engines over radial engines?
- better handling
- better lubrication
- better cooling
Which car brand is known for its occasional use of specific types of Wankel rotary engines?
What sort of cooling keeps rotary engines from overheating?
- air cooling
- nitrous cooling
- liquid cooling
What phrase is used to describe a rotary engine's oil usage?
- total loss
- low ratio
- low viscosity
Which British fighter plane used a rotary engine?
- Sopwith Snipe
- Armstrong Whitworth F.K.8
Where was the engine placed in the Megola, a 1920s German motorcycle?
- front wheel
- rear wheel
Wankel engines can produce more power with less …
- oil checks
How the gyroscopic effect of the spinning engines affect fighter plane performance?
- Right turns were slow and arduous.
- Left turns were alarmingly fast.
- It was pretty easy to keep the plane level.
True or false: Wankel rotary engines produce fewer emissions than piston engines.
The first rotary motors omitted which part altogether?
Which company made some of the most reliable rotary engines of the World War I era?
- Gnome Engine Company
- Hall-Scott Motor Co.
What does a radial engine have that a rotary engine does not?
- spinning crankcase
- rotating cylinders
- rotating crankshaft
What was the approximate horsepower rating of the most powerful rotary engine from a World War I fighter plane?
- 250 horsepower
- 140 horsepower
- 98 horsepower
When were the first Wankel rotary engines patented?
When did Felix Wankel finish his first working prototype?
What is one advantage of a Wankel rotary engine over a regular combustion engine?
- shorter stroke duration
- compact design
- better sealing against the chamber ends
Why was the Mazda RX-8 ushered into retirement in 2012?
- poor emissions performance
- too many oil leaks
- random engine failures
Why are Wankel rotary engines inefficient in terms of fuel usage?
- The air cooling system means it needs a higher fuel-to-air ratio.
- They have too much friction.
- They work best at full throttle.
What was an unfortunate consequence for pilots who flew rotary engine fighters?
- They were shot down because they were slow.
- Oil from the engines splattered all over them.
- Gasoline fires were a common occurrence.
With older Wankel engines, cold weather often caused which problem?
- excessive vibration
The simple design of Wankel engines means they resist what?
- crankshaft breakage
- oil leaks
- catastrophic failure