KingZarkon
KingZarkon t1_jdwgo9p wrote
Reply to comment by MAS2de in Does living in an airplane flight path, near an airport, pose a health risk? What happens to the lead from the jets fuel? by [deleted]
>Will leaded avgas for small piston planes still be the only common option?
Leaded avgas will certainly be banned by that point, if not sooner. Older engines designed for leaded gas depend on the lead and other additives (like zinc in the oil) for wear protection but those can be managed by adding a bottle of additives to the gas for planes that still need leaded gas.
KingZarkon t1_jcz4i8e wrote
Out of curiosity, what does that translate to?
KingZarkon t1_j5z8y96 wrote
Reply to comment by cjameshuff in Why do sample return missions such as OSIRIS-REx use their own reentry vehicles instead of just going to the space station for pickup and return with ISS equipment? by PromptCritical725
Isn't it just Newtonian math? I mean, we know the weight of the craft, how much thrust it has etc, so why is it so hard to calculate?
KingZarkon t1_ivc2zbw wrote
Reply to comment by l337hackzor in What is the cause of the steep escarpment at the base of Olympus Mons? by Strong-Ball-1089
It would stop the rear wheels but they would just lock up and end up dragging behind when you've got a fwd vehicle.
KingZarkon t1_ivbs6ap wrote
Reply to comment by mrbombasticat in What is the cause of the steep escarpment at the base of Olympus Mons? by Strong-Ball-1089
From another comment I made, if your throttle is running wide open, then you lose engine vacuum. You have what's in the vacuum reservoir but that's it. Without regenerating it, you have enough to hit the brakes once, maybe twice with good power. After that, there's little chance a person could push the brake pedal hard enough to overcome the engine at full throttle. I suspect these tests have not taken that into consideration.
KingZarkon t1_iugnayj wrote
Reply to comment by urzu_seven in ELI5 Why are airport ceiling so high? by TrShry
It was originally supposed to be for processing but someone decided the viewers were too stupid and changed it to batteries. Something like that anyways.
KingZarkon t1_iugn6d8 wrote
Reply to comment by WayneConrad in ELI5 Why are airport ceiling so high? by TrShry
That's at rest. If they are active, say walking around in an airport while carrying luggage, that goes way up.
KingZarkon t1_jdzwod4 wrote
Reply to comment by sonicjesus in Does living in an airplane flight path, near an airport, pose a health risk? What happens to the lead from the jets fuel? by [deleted]
>Has nothing to do with wear. Leaded fuel has a very high autoignition point that prevents knock. Modern fuel uses alcohol, but engines designed for alcohol free fuel are dangerously unreliable.
Turns out, it does both, actually.
>Lead allowed the development of higher 'octane number' fuel (the higher the number, the greater the resistance of the fuel to uncontrolled burning in the engine, or 'detonation'), and was also discovered, later, to have the property of protecting valve seats from wear.
Source
As for knock, you could just go all the way. E85, for instance, doesn't detonate, period. You can run the timing all the way to TDC and be fine. Would need bigger fuel tanks, though, so that might cut into payload a bit.