Engineering

Hello fellow bassoon players! (Plural just in case) Shoulder straps or harnesses carry bassoons at the boot, or the joints might separate. This is much below the centre of gravity. An extendable part can fasten the strap higher on German bassoons, French ones typically lack it. Also, the holding point is always between both bores, supposedly because wood is thicker there, but when playing the tenor joint is almost above the bass joint, so the bassoonist must roll the instrument manually. Here's my makeshift solution to carry comfortably a bassoon, in this case a French system. It's comfortable and can inspire a durable elegant design. …

What contraptions can re-direct sunlight during dawn to dusk hours towards a single direction ? Is there some prisms, lenses, mirrors, combination of them ? The solar tubes product seems does it well to a certain degree; may have been designed as best as the manufacturer could. The point of entrance/collection of solar light... What other passive methods exist ? -No heliostats, no moving parts-

Glass reflects all visible light depending on how it catches it. But, can glass be laser cut to a specific angle, or treated, to reflect a specific wavelength of light e.g. red ? Similar to annealing stainless steel (heating it to create an oxide layer) which gives steel "colour".

I briefly talked about this before on this forum about the process of how a car works, gasoline burns and in doing so gives off kinetic energy which goes through a bunch of processes (pushing pistons, turning gears, ect.) until finally it gets to the wheels and serves its intended purpose, moving the car forward. Anyway I believe it was mentioned here that about 80 percent of the energy is lost, its lost in the form of heat and friction. If only 20 percent of the energy is used to make the car go that's quite inefficient, can we make cars more efficient?

Dear visionary inventors, megalomaniac engineers and audacious explorers, Chemical rocket engines aren't up to our desire to hop in the Solar system: go quickly to Mars, deviate Earth-threatening objects, and so many more missions. We need a higher ejection speed to save propellant mass, but this takes more energy than chemical reactions bring. One possibility is to tap Sunlight instead of transporting the energy. I suggest - as others did - to directly heat the propellant with Sunlight. Converting first to electricity would enable even higher ejection speeds, but direct heating is energy-efficient, so for a long weak thrust, the collector area is feasible - smaller…

Hello everybody! Some sensors need a huge input impedance: if highly resistive, if capacitive, at low frequencies - reasons vary. Commercial resistors exist up to 22Mohm, uncommonly 100Gohm, and high values integrate badly on a chip; instead, I propose to polarize the amplifier by photocurrents. The loop can provide a feedback at frequencies lower than the signal, or include the signal frequencies, or set a zero when not sensing the signal - or other uses and their combinations. Over a resistor, photodiodes have the advantages of a huge impedance up to some 0.2V, especially if used in the photovoltaic mode (=without external bias) which has zero residual current. Thi…

Hello All, I have completed my b.tech in 2020 with computer science and after that i have done the certification for c++ programming. I want to know the average salary of software engineer? I have checked link removed and found the information which is 0.8M per year in India. Can anyone suggestion me, Is it right?

Could hand held motor be powered from the resonance of power supply cabling behind a dry-wall ? Nothing hardcore, but enough to get it going; as if connected to a 9V battery.

Hi! I was trying to analyse the RC series circuit for a sinusoidal AC input. I fed the input with an AC voltage V1sin(wt), and found the differential equation for the voltage across the capacitance Vo. RC dVo/dt +Vo = V1sin(wt) I assumed the capacitor was chargeless, so Vo = 0 at t=0. Next I tried to solve for Vo using two methods. I used Laplace transform and brute-force solving the differential equation itself. However I arrived at two different results, considering the same initial condition. Please see if I'm missing something. Or do give an explanation. I know it's very trivial, but this is getting on my nerves. P…

Consider an unmanned lunar cargo lander that delivers 5,000 kg to the lunar surface. The delta-v for landing from a low lunar orbit is 2,100 m/sec. and the Moon's gravity is .16 Earth's. Now, consider that same lander used to land a payload on Mercury from a low Mercury orbit where the delta-v involved is 3,200 m/sec. Mercury's gravity is .38 Earth's. All of the physical characteristics of the lander must remain the same, only the payload mass can be altered. How much payload must be off-loaded to accomplish the landing? Thank you. . .

Hi, Not an electrical engineer. Im looking for a replacement for a Mean Well SP-320-24 and I cant find something with the exact same specs. Is it better to overshoot the output amperage meanwell original https://www.amazon.com/MEAN-WELL-SP-320-24-Supply-Single/dp/B005T8X19K potential replacement https://www.amazon.com/Supply%EF%BC%88SMPS%EF%BC%89Constant-Transformer-220VAC-DC24V-Monitoring-Industrial/dp/B0782RGQJ9/ref=sr_1_10?dchild=1&keywords=120vac+to+24vdc+power+supply&qid=1627664937&sr=8-10 another potential replacement https://www.amazon.com/Aclorol-Switching-Universal-Regulated-Security/dp/B082TTQZ4H/ref=pd_sbs_19/137-4265577-6618049?pd_r…

Hi. Can the video recording of the event show if the lower structure failed first and the top structure dropped crushing on what was already collapsed; or if the upper floors near the roof failed first and their consecutively fall on next floors under fractured them ? A sink hole would produce the first behavior, right ?

Hello all. Having a problem with 'tile' meaning a perforated pipe. But hey, it is English and am not the one to fix it 🥴 [ Image borrowed from the net.] Unsure of positioning the perforations under the pipe half for proper drainage. Seems like the gravel below the perforations level will always be flooded, (never flowing upwards to drain into the pipe) Shouldn't the pipe have no gravel under it, and perforations on sides ? What is the rationale ?

- I have a surface and am constantly measuring the impedance - I placed an object on the surface, any material Is it possible to use the impedance to detect a change? I'm not interested in the specific weight/mass, just interested if a "change" was triggered? Take it a step further, would a rise or drop in impedance correlate with objects being added or removed? Thanks!

And if so, would any telescope pointed at the moon be, in turn, de facto surveillance of any position on the face of the Earth? (For good or for ill; anyone looking to misuse this technology would probably come up with it independent of our discussion so best we discuss whether it'd work before we come to any conclusions on whether it'd be something that'd need to be stopped if useful.) I ask this because I was recently thinking about this involving their counterpart in the form of concave mirrors: Which while the image quality isn't ideal, one can still get a rough idea of what is going on in the reflected image. I'm t…

Hello everybody! Rockets must be light to attain a high speed, but their thin structures, pushed by the engines, are threatened by buckling. Usual tank construction includes sheets milled down to an isogrid structure, or omega stiffeners welded on a sheet. I propose to assemble rocket structures from tailor-made extruded profiles instead. http://en.wikipedia.org/wiki/Extrusion Extrusion can produce thick profiles consisting of thin walls that build closed channels. Such walls are well supported hence strong against buckling. The extrusion direction parallel to the rocket axis has advantages. All walls bring strength against rocket bending moments and axial co…

I suggested repeatedly to electroform Ni and Ni-Co, possibly allied with Mo, for music instruments and more scienceforums and later and elsewhere Strong electroformed alloys would serve many more uses. For instance rocket chambers are of nickel electrodeposited on an inner copper jacket where cooling channels have been milled. But what alloys might be possible? Please remember I'm not reliable on electrochemistry. Strong nickel alloys are known, mainly for superalloys used in gas turbines. They consist of Ni, 20% Cr, 0-20% Fe, <20% Co, <10% Mo, <5% Ti, ~1% Al, Nb, and some more. Nice source: Nickel and Its Alloys, monograph 106 by the National B…

What money does When one uses money to do something, the usage of money reduces the time and effort one has to spend to do this something, because if you REALLY think otherwise… When one uses money to do something, the usage of money doesn’t reduce the time and effort one has to spend to do this something, but if you think this is REALLY ok for you… If in the end, when one uses money to do something, the usage of money doesn’t reduce the time and effort one has to spend to do something, it doesn’t seem to me one knows how to use money…does it seem to you…idiot? Who is good at making money When one is good at making money, one …

Boeing 737 max - does the system give 15 seconds for pilot to disable the autopilot system?

Hello, heirs of James Clerk, Nikola and the others! It is well known, but by too few people : in an electric machine, only the force means losses and heavy parts, the speed comes for free. When a motor or generator runs quickly, say 50 or 100m/s at a power plant, it is smaller than a turbine. Quick machines with rotating permanent magnets use to hold them in a tight sleeve of strong steel to counter the centrifugal force. I propose to wind a composite of graphite fibres around the magnets instead of the steel sleeve. Graphite fibres are lighter than steel and produce less eddy current losses where they cross the stator's windings; better, while the accurate diamete…

Now, for a bit of social and urban engineering trivia, here's Kowloon, the walled city of Hong Kong: https://www.businessinsider.com/kowloon-walled-city-photos-2015-2?r=MX&IR=T

Hello Everyone, Recently my research work investigating the quality of engineering skill in the UK was peer reviewed and published. I'm am trying to publicise this research as much as possible to hopefully make some real changes to the educational systems for engineers in the UK. Please have read, the below link is where you can download the paper, feedback is welcomed. links deleted Thankyou, Sam Edwards. BEng (Hons), IEng, MIET.

So the question arises, why be at the bottom of the sea? The international space station has a lot of scientific experiments that can only, or best be performed in microgravity. So I ask the question what experiments can best be performed at the bottom of the sea? What comes to mind is the pressure. Immense pressure. Almost 2x the pressure that we can generate with pump technology. 690bar seems to be the upper limit of pump technology, but Challenger Deep rests at 1014 bar. And so I suggest that there is opportunity for experiments here. Enter the "Diamond Anvil Cell." https://home.hiroshima-u.ac.jp/kawazoe/html/Kawazoe04-Method-EN.html https://www.scien…

In continuing my series on a deep sea base, another hypothesized reason of being there is biotechnology. This one seems more probable than the diamond anvil cell. The most obvious need is to research piezotrophs in their natural habitat. If the lab can be ambient pressure then the lab really can just be as flimsy as tin foil. Not literally, but relatively speaking that's still true. The problem of deep ocean comes from pressure hulls and ballasts that can survive those depths. Even the best ballasts, syntactic foams, are likely to crack and their failure means the loss of the lab to the Deeps. Enthalpy has shown some other interesting solutions to ballast, but u…

I call it the "hydrolock". People may not realize, because often times "space" is considered the most difficult frontier, but there currently is no docking system for deep ocean. If you want to go to the deep ocean you have to enter a pressure vessel on the surface before your long descent. We are basically at the Mercury mission stage if comparing deep sea exploration to space exploration. Space was easy for a reason I'll mention below. I've been working on this thought problem about how to create a docking system for deep sea bases. It's not as straightforward as one might originally think because the system has to: 1) maintain hull integrity the whole time.…