Why two stroke engine not used in aircrafts?

Answer 1

In the two stroke petrol engine as you know suction,compression,ignition,expansion and exhaust is completed in only two stroke and one revolution of crank wheel

more over diesel ignites at very high pressure which is not the same in case of petrol........if petrol is also ignited under pressure it explodes producing a big thumping sound.called KNOCKINGthis may reduce the power output and also lead to breakdown of the engine.

For the above reason two stroke engine cannot compress air and ignite the fuel like diesel engine.

Answer 2

two stroke engine are better than 4-stroke engine in the following ways:-

in 2 stroke engine there is only one revolution of crank shaft and in each revolution the power is delivered (in power stroke). thus it has a good mechanical efficiency rather than the 4- stroke engine.

also the power we get through 2-stroke engine is double than the 4-stroke engine because of the same reason written above.

2-stroke engine is lighter than the 4-stroke engine because in 2- stroke engine there are no valve mechanism thus no push rod, cam-follower arrangment, rocker arm etc, thus 2-stroke engine is lighter than the 4-stroke engine.

in 2 stroke engine in each revolution the power is delivered (in power stroke) thus torque is uniform, hence less torsional oscillation occurs.

Answer 3

They are, microlight or ultralite aeroplanes use typically a Rotax two stroke engine. They are very reliable (used for skiddos) and cheap compared to the alternatives.

Answer 4

It is possible but has not been invented and would most likely be inefficent

Answer 5

The first two-stroke engine to have any success was built in 1878 by Sir Dugald Clerk. He was granted a patent for it in 1881.