Recent comments in /f/explainlikeimfive

dr_xenon t1_j6imocs wrote

A Diesel engine, or any piston engine is limited by the linear speed of the piston. When the fuel air mixture is ignited, the flame front travels around 4000 ft/min. The piston can’t travel any faster than that. The stroke of the engine and the rpm determine how fast the piston is going.

An engine with a short stroke can rev much higher than one with a long stroke. A diesel engine tends to have a very long stroke to get the high compression ratios, hence a low redline. A small motorcycle engine has a short stroke and can rev much higher.

Rotary/wankel engines don’t follow this rule.

Turbines have a different combustion system in stages which allows it to go higher rpm.

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aspheric_cow t1_j6imjzt wrote

3.5mm earphone jacks have been standard for ages though - the original Sony Walkman (released in 1979) already had it. My understanding is that the airline industry deliberately chose a different connector so people won't steal the headphones. Then later, they switched to 3.5mm when headphones became dirt cheap and not worth stealing.

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CrushAtlas t1_j6iljum wrote

For one, the forces are different. You're comparing the rotational force of a turbine against the reciprocating mass of a piston engine, the forces at high RPM are incredibly strong on a connecting rod.

Secondly, diesel engines are compression/ignition design and are very efficient and make lots of torque at low RPM so there is no need to spin it faster.

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Flair_Helper t1_j6ik574 wrote

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