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Evolution. The monkes who couldnt move their legs after sleeping on it got eaten.

Most likely this distinction between nerves happened first in Amphibians or Reptiles and goes way back to the first land vertebrates who actually had to deal with the weight of their own bodies.

If Fish dont have this distinction then my guess is right

Can we really trust members of the same team or even same organization? I consider myself an honest person, but unconscious biases can easily slip in, especially under pressure and lack of sleep.

The honest reason? Who writes the regulations? The same people who have private planes. Banned lead in avgas would basically mean retiring the majority of the private planes in the US. Rich guys don't like that, regulations remain unchanged. If the regulation was pushed through the oil companies would absolutely, 100%, develop an alternative and they'd do it quickly. Right now they have quite literally ZERO motivation to do so.

Whats HNPP?

You're thinking very much in terms of "What can be done with today's electric propulsion and storage technology?" In 30 years will electric planes be more common? Will leaded avgas for small piston planes still be the only common option? Think of where batteries have gone in the last 20 years. Where will they be in 30 years from now? What amazing breakthroughs in lab batteries in the last 10 years are being fleshed out and readied for production in the next 5-10 years? Or even today. Like Amprius doubling the Wh/kg with 1/2 the Wh/L of the previous reigning champs. See how it starts to get difficult to say that electric powered craft will never be viable for your 500 mile trip? Unless engines make some big leap in efficiency that they haven't done in the last century and can suddenly use even half of the 45 kWh/kg available to them and just run away with the range crown, it's possible for ev aircraft to become a viable option in our lifetimes and not just a neat party trick.

Interesting. In auto world bore being larger than stroke is usually a sign of high-revving sport-ish engine.

>you would have more exposure near smaller municipal or regional airports

For increased exposure, grow your produce right past the end of the runway. Nothing like fresh organic fruits and vegetables rich with vitamins and tetra-ethyl-lead.

They're also helpless potatoes at 5 months, but a lot more pulled together. Perhaps coincidentally that's also around when they start not being a complete nightmare wrt sleep.

For two particles you can't be sure, indeed, you can only tell from statistics if you have a large sample.

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> Can a jet engine run on avgas?

Firstly, turbine not jet. And not only can they but it is in the maintenance manual and the POH/TO for the aircraft.

A plane I flew had this very limitation. 100 hours of operation on 100LL.

Turbines can run on all different kinds of fuels, including gasoline/avgas. It doesn't mean it will produce its rated power, or will be as reliable as when running jet fuel, but it will run. Avgas/gasoline will definitely ignite from compression alone. Remember, Avgas is leaded so it won't ignite from the heat of compression in a piston engine at its designed compression ratios.

C-130s for example have a section in the flight manual about alternate fuels. They list things like diesel, kerosene, gasoline, avgas, etc, but they're all intended for extreme circumstances (stuck somewhere without jet fuel and need to get out now) and all have maintenance requirements after using them.

That being said, I highly doubt modern commercial turbofans are certified to run these alternate fuels. But from a technical standpoint, they would most likely run.

I can assure you that gas turbines have ignitors and can run on a large range of fuels, AVGAS included.

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It's not used in airliner flights because that's not the fuel the engines were designed for.

Can a jet engine run on avgas? Probably, but it's probably not allowed by the certification of the aircraft, and thus is not allowed by the regulations. Some military aircraft have allowances for short runs using alternate fuels like avgas, actual kerosene, diesel, etc, but I doubt most civilian airliners have this option at all.

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AVGAS isn't used in turbines because it's the wrong fuel for them, and they will not run. AVGAS needs a spark to reliably ignite, and turbines don't work like that - they're effectively diesel engines and ignite the fuel from the heat of compression.

I stand corrected. Turbines *will* run on AVGAS, but it's not recommended, and can have other issues.

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This is 100% wrong. Tetraethyllead as a fuel additive has nothing to do with protection against icing. It's all about increasing octane and reducing detonation.

Airplane engines are designed for torque at low RPM vs horsepower at high RPM, hence the very large bore sizes in aircraft engines.

My Honda Civic has a 1.5L (91 cu in) turbo inline 4, and pulls 174 hp at 6000 rpm, and 162 lb-ft of torque.

A Lycoming O-360 aircraft engine is normally aspirated with a 5.89L displacement, and produces 180 hp at 2700 rpm, but 350 lb-ft of torque.

Pretty massive difference.

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yeah. after dad planted the seed he travelled a great distance to get away