Engineering

The expander cycle pumps oxygen to the chamber, and hydrogen to a higher pressure into the cooling jacket where it evaporates. Lukewarm hydrogen passes through a turbine and flows in the chamber. It gives the RL-10 and heirs good performance, simplicity and an easy start. Operation with methane was demonstrated. Though, an engine burns fewer methane moles with more oxygen moles; I propose instead to pass the oxygen through the jacket and the turbine, which enables higher pressures hence improves the performance. I compare with 400K before the turbine, 74% and 79% efficient pumps and turbines, injectors keeping 88% of the pressure - and no drop in the cooling jac…

https://www.cracked.com/personal-experiences-1848-i-work-in-nuclear-power-plant-5-insane-realities.html "A small mistake during the reassembly caused 50 gallons of thin, flammable, corrosive oil to go spraying everywhere. Another time, the control room people goofed and shut a massive valve to the cooling tower before turning off the pump. The resulting pressure caused the pipe to burst, and we had ourselves a man-made geyser. Of course, this was in the winter, so the whole thing then froze solid. Yes, I realize I'm painting a very Homer-Simpson-ish portrait of the operation. But to be extra clear: None of that put the public in danger. These are expensive pro…

We've tried mask mandates. But those either weren't enough; or weren't enforceable enough; to adequately curb the pandemic. We've tried vaccines. But we don't even know if they'll be effective against the new strains of THIS pandemic, let alone whatever other pandemic we're dealing with NEXT time. It seems increasingly like everything short of a lockdown is a half-measure. While I'm sure many people would object to lockdowns on "freedom for freedom's sake" grounds, a number of people object to them on "how the hell will I get my groceries?" grounds. And for that, we need... a pandemic-proof system of food distribution. Befor…

Hi. Picture a bunch of solar panels on a roof to generate 3KW electricity. The purpose, to heat a dwelling, nothing else. No connection to mains, no inverter to supply appliances nor lighting. Just heat. Powering a heater during the daylight hours, warming the dwelling plus heating up something that will release warmth at night time. A water reservoir works well absorbing/releasing heat, but needs piping implemented toward radiators like in some very old houses. Barrels of rocks heated by electric elements can warm air passing trough them to release warm air at nights into existing HVAC ducts. What if the rocks are replaced by iron scrap, like engine …

I am trying to remove the friction material from automatic transmission brake bands, they use a "phenolic" glue which dried for 24 hours and is then baked at 204 degrees, my question is how can I remove this "polymer" bonding agent in order to reline with the new friction material ? I have tried a gas torch and this is very labour intensive not to mention the fire risk, but it still needs to be bead blast to get the residue off, I was curious to see if there is any chemical I could use to soak them off ? but I couldn't find anything that will attack this "thermoset" material. Any help would be very appreciated

Greetings. A LED emitter can have a long life. Even longer if underdriven from specifications. Asking for an educated guess... A LED designed to operate on 1 Watt of power, if energized to 1/10W; would it last 10 years ? 100 years ? Same question if it is a laser diode.

Does anybody have a piece of information about microsatellites? I wanna know the capability they have, what kind of mission they have, will microsatellites be able to substitute the satellites we have now?

Could you fine people please help me identify this pump for a project? Im working on a movie prop with my son (got to have a hobby to pass this lockdown), it’s from the film Die Hard 3 but we’ve hit a wall looking for part. It’s a graduated cylinder which uses a rack & pinion gear to drive a graduated plunger, My first thought was a syringe pump but there are no syringe plungers with rack teeth that I can find, then I thought is it a graduated cylinder but I can’t find one with an output at the bottom. It’s definitely a real world item but I can’t find any details. thanks in advance Rich

If you take a spur off the ring main to a suitable external socket on an outside wall of the house, can you spur off that to put a socket in a nearby garage? What would be a UK-compliant arrangement under current regs if that isn’t? The goal is to have a weatherproof socket on the outside wall and power to the garage, which is a few metres away. Expected power demands will be a tumble dryer, freezer on constantly, and whatever power tools are being used.

Too many times are things too good to be true. It seems to me if it were really true they could use materials like graphene. Or make such bold claims as the beginning of perpetual energy if it charges in as little time as they say. If it is real how many years till it is used? Or widespread?

Hi, I installed manually a LPG tank and other devices for my car but the mixer[air/fuel] Then i thought what will be if i connect the pipe of output of LPG into the Air filter box directly without any mixer, But i cut wires of the TPS and put one resistor instead of that that deceive the ECU and the ECU think the Throttle is always closed and command the Injector to inject fewer fuel [at all speeds] But I connect the TPS to a series of devices that inject LPG instead of the rest needy fuel[petrol] Is that Okay !? Means at once there be Petrol/LPG/Air mixed together into the engine

I am trying to figure out the difference between a rheostat and a bridge rectifier. I tried Wikipedia, a bunch of resources and even a few videos, such as this one (url deleted) but I’m still not 100% sure about the difference. Can somebody here tell me like I’m 5 what the difference is.

Several countries have tried using Bluetooth to measure soical distancing distances. None (to my knowledge) have found a successful method. So what are the problems they are facing ?

would you like to share your opinions in convenience of title? let us learn which engineering book you mostly enjoyed,pleased to read and why.

Hello I am a student from belgium. I work in a group. For our thesis we have the topic "range of an electric car". My question is what you think we could test. How could we improve the range? We increased the mass of the wheels and as a result we increased the battery life a little but not much. Would you like to help me. Thanks in advance

Should car manufacturers blame road design and construction or themselves if their technology fails to account for all road types ? https://www.bbc.co.uk/news/uk-england-somerset-55571080

All of you probably know how the test launch of Starship ended. But what was the reason it crushed? Was the test successful for Space X, notwithstanding the final landing part?

Hi, I'm trying to find a window covering that will block out UVA. I'm posting this on a few boards, so I'm sorry if you're seeing this question in various places. I need this for a temporary residence (about a year) with many large windows and an insane amount of sunlight coming through them. I don't do too well with sunscreen and would prefer not to apply and reapply many times a day while I'm home. I take a number a couple photo-sensitizing allergy meds, plus I like to care for my skin in general. I'd love to find something cost effective that does not require drilling into walls. I've read UV window film does not block out all UVA wavelengths, so I'd rather skip that. …

If we replaced the engine with a thermo-nuclear engine, and used water as the fuel, could you produce enough thrust from the steam to get into orbit? And considering the amount of water on earth, would it make a good engine for space exploration?

People love to drive. For some people, it's literally to die for; the tens of thousands who die driving have not deterred people thus far. In practice, it's not just those who drive who can be killed, but those who get run over by cars while walking. So "I have the risk to assume the risk" is not as valid an argument as it would be for, let's say, eating junk food. On top of that, even the individuals who claim they'll drive more safely than others do (which I suspect is mostly said by those for whom its not true) are still harming others through greenhouse gas emisisons that result in flooding. But it's still popular enough that libertarian and non-libertaria…

Hey everyone, I have a project that I am working on and I am in search of any material that is completely heat resistant up to about 150 degrees and does not change form, if there is such a substance out there. If anyone knows if there is a good heat resistant pant out there that would be awesome as well. Glad my title is grammatically correct...are* Thanks, -Jason-

If we add stuff on for the next generation of them, What else could we do with it? would it be possible to attach solar panels to the top of them, then use the energy to power lasers or radio waves to power aircraft? what about a solar farm, I've read they'll be around 48000. would it be possible to support space manufacturing?

The seed of vegetation, properly worked, produces a perfect, restful, productive ecology.

Hi. Is it possible to reduce all about arc welding; like using a sewing needle-size electrode, much less current... to work on tiny parts, with either arc, TIG or MIG ? 🙄 By the way... is there a minimum size for a flame; that smaller does not sustain ?

Hello, I want to know if someone can explain me how the resonance is induced in micromechanical resonator please? Is it with a piezoelectric crystal?