it is economical
The power events occur more often with more cylinders. That then doesn't require a heavy flywheel to keep the engine rotating smoothly.
smaller lighter flywheels allow an engine to rev up faster, less mass to accelerate, a heavier flywheel will give more power at low rpms by smoothing the pause between power strokes
that isn't always true. however, smaller engines are made towards higher rpm's. and also rev up faster. larger engines are more for torque, and smaller engines are more compact and for lighter cars.
They are - most inboard engines are 4-stroke. But as with land vehicles, you can get a smaller engine with 2-stroke (or more horsepower with a smaller engine) so the small engines like some outboards tend to be 2-stroke.
That would depend on the size of the engines. A 4 cylinder is much smaller than a V8.
Champion RCJ8Y. Very common plug for smaller 2 cycle engines. Champion RCJ8Y. Very common plug for smaller 2 cycle engines.
Model rocket engines are reproductions of rocket engines that are scaled down to a much smaller size than the real thing. They usually don't do anything and are for display purposes.
Jet engines are made of fans, they get smaller and smaller as the jet gets deeper... U know how jets are big at one end and small at the other? That's because the fans get smaller and what it does is the air condenses and escapes at a great force through the other side.
Smaller planes have piston engines, but bigger planes like the Boeing 717-777 and other planes have turbine engines
Motorcycles and Aircrafts are two of the main vehicles that uses an air cooled engines. They use this feature since they normally have smaller engines then a normal moving vehicle.
they're the same as the big ones, only on a smaller scale.
They can be. Petrol engines can be either fuel injected, or have carburetors. Smaller engines, like scooters, lawnmowers etc are almost always carburetted, while car engines are usually fuel injected these days.
It depends on the size of the aircraft. A smaller airplane like Cessna has only one engine. The biggest cargo plane like Antonov has six engines.