Recent comments in /f/explainlikeimfive
sepientr34 OP t1_j6in4vz wrote
Reply to comment by dr_xenon in Eli5 Why gas turbine can rev at >10000 rpm but diesel engine red lone at 3000-4000 rpm? by sepientr34
If I remember correctly flame from turbine need to be ignited once than you just switch of the ignition unlike piston engine
dozure t1_j6imzq0 wrote
Reply to comment by epic1107 in eli5: Why do most airlines still use 2-pin audio jacks for the in-flight entertainment systems on their planes? by JJGLC92
I fly a little more than you, mostly US domestic, mostly Delta. Had no idea what this post was about, only ever seen 3.5mm jacks. So yeah, maybe its a regional thing.
[deleted] t1_j6imu8n wrote
dr_xenon t1_j6imocs wrote
Reply to Eli5 Why gas turbine can rev at >10000 rpm but diesel engine red lone at 3000-4000 rpm? by sepientr34
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.
Foef_Yet_Flalf t1_j6imo69 wrote
Reply to comment by MrM_37 in Eli5 why does eating boiled potatoes make you feel full quicker than eating fries even though fried potatoes contain more fat & calories? by MrM_37
I'm adding butter and salt to my boiled or mashed potatoes. Who isn't?
aspheric_cow t1_j6imjzt wrote
Reply to comment by stephenph in eli5: Why do most airlines still use 2-pin audio jacks for the in-flight entertainment systems on their planes? by JJGLC92
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.
[deleted] t1_j6imf9d wrote
Reply to comment by redditlurker67 in eli5: Why do most airlines still use 2-pin audio jacks for the in-flight entertainment systems on their planes? by JJGLC92
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[deleted] OP t1_j6imbgq wrote
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Yoink1019 t1_j6iltmd wrote
Reply to comment by Kleysley in eli5: Why do most airlines still use 2-pin audio jacks for the in-flight entertainment systems on their planes? by JJGLC92
So, mono audio?
sepientr34 OP t1_j6ilrae wrote
Reply to comment by CrushAtlas in Eli5 Why gas turbine can rev at >10000 rpm but diesel engine red lone at 3000-4000 rpm? by sepientr34
Why don't gas turbine have trouble burning fuel fast enough but diesel has (I never see sooth from gas turbine engine!)
CrushAtlas t1_j6iljum wrote
Reply to Eli5 Why gas turbine can rev at >10000 rpm but diesel engine red lone at 3000-4000 rpm? by sepientr34
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.
epic1107 t1_j6ikpy3 wrote
Reply to comment by pseudopad in eli5: Why do most airlines still use 2-pin audio jacks for the in-flight entertainment systems on their planes? by JJGLC92
I've been on close to 40 flights in the last 5 years, and I can't remember a single one with standard 3.5mm. All had the two pin connectors.
I was flying mostly in the SEA and Middle Eastern regions, so maybe that's the reason?
Flair_Helper t1_j6ik574 wrote
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Flair_Helper t1_j6ik4hs wrote
Reply to ELI5: Is there any reason for having USB 2.0 ports in a USB 3.0 age other than price? by HugeLibertarian
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shawnaeatscats t1_j6ik1ov wrote
Reply to comment by [deleted] in ELI5: What causes the stomach to make an audible grumble noise when it requires food? by bdcubedon12
Oh I guess this does make sense. There's pain when ur hungry, there's pain when you have gas. The pain goes away when your stomach growls, and the pain goes away when you flatulate.
BackRowRumour t1_j6ijyc0 wrote
Reply to comment by Dorocche in Eli5 why does eating boiled potatoes make you feel full quicker than eating fries even though fried potatoes contain more fat & calories? by MrM_37
I appreciate you looking into it. I can't stand raisins myself, so the risk seemed low. But I thought it was worth mentioning.
Kleysley t1_j6ijx8l wrote
Reply to comment by blackbirdblackbird1 in eli5: Why do most airlines still use 2-pin audio jacks for the in-flight entertainment systems on their planes? by JJGLC92
Might work sometimes, though last time I did that I only got audio on one ear...
[deleted] t1_j6ijx0b wrote
Flair_Helper t1_j6ijvwu wrote
Reply to ELI5: what does "salience" mean? by CoatedGoat
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Flair_Helper t1_j6ijvjm wrote
Reply to Eli5 - “Good morning America. It’s 8 a.m. “ by tuff_gong
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[deleted] t1_j6ijs7b wrote
fescil t1_j6ijqxx wrote
Reply to comment by Adventurous-Tour-981 in ELI5 - why body massage are always better when done by someone else? by Adventurous-Tour-981
You would also stab and bash yourself with things all day long, man. Come on
fescil t1_j6ijey1 wrote
Reply to comment by MrM_37 in Eli5 why does eating boiled potatoes make you feel full quicker than eating fries even though fried potatoes contain more fat & calories? by MrM_37
I disagree. I think boiled tatties feel much more wholesome and appetizing than the puffed up fry.
KennstduIngo t1_j6in5ln wrote
Reply to comment by Yoink1019 in eli5: Why do most airlines still use 2-pin audio jacks for the in-flight entertainment systems on their planes? by JJGLC92
Mono audio generally means having one channel of sound, whether you are using one speaker or ten to play that one channel.