Recent content by Sam Phillips

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    I Can Satellites in Frozen Orbits of the Moon Study Different Ground Areas?

    Darn, that means a satellite at 22km would have a limit of 1148.18km of observable distance on the surface. Only 7.7% of the surface area of the moon. Even less when you account for obstructions... O well, you can't fight physics.
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    Electromagnetic Levitation for a stationary hoverboard - How can I do it?

    I think I understand the problem, and you don't have an easy solution. Magnetism loses its strength rapidly as you move away from it, and if you add the two poles of the magnet constantly wanting to flip your board over then you have a tough road ahead. You might not need to use...
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    Designing an Automatic Coolant Monitoring System for CNC Machines

    My question about separation refers to the mixture at rest. Will the concentrate slowly separate from the water (think of dirty water with the particles slowly drifting to the bottom) or is it fully dissolvable like salt water where time will never cause the dissolved material to separate. New...
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    I Can Satellites in Frozen Orbits of the Moon Study Different Ground Areas?

    The hope is to use very small satellites with weaker sensors to save on cost and launch weight, then make up for that by placing them in an extremely low orbit (hoping for 20km). Apollo missions orbited between 60-70mi from the moon during their time. But from what I am reading, large mass...
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    Designing an Automatic Coolant Monitoring System for CNC Machines

    I have done a large amount of plumbing in my day, and I think I can offer some help here. Before I try though, I just want to make sure that I'm understanding the core problems as I have been reading down the posts: 1. You have several machines in a factory that require coolant solution...
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    I Can Satellites in Frozen Orbits of the Moon Study Different Ground Areas?

    Quick question for the people to better understand orbital mechanics. Due to large mass concentrations on the moon's surface, there are only four orbital inclinations that a satellite can be at to maintain an indefinite orbit: 27°, 50°, 76°, and 86°. My question is this: If a satellite was...
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    Storing Energy as Heat in Vegetable Oil

    I worked as a solar power plant developer for 6 years and the problem always came down to efficiency, cost, and maintenance. Then there is the almighty cost vs benefit analysis. There were 4 main types of power storage that we explored: batteries, pumped water (pump water uphill and let if flow...
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    Reflection of only visible (safe) light on moon/mars

    Since glass can have a filter applied to block UV, could you apply this directly to the glass on silver mirror? If so, is that blocked UV light converted to thermal energy or reflected along the glass?
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    Least cost to get a self-sustaining space infrastructure

    Their are two costs to space infrastructure. The first is getting the infrastructure to its destination, whether its Low Earth Orbit, the moon, or Mars. Once you have the infrastructure in place the cost is maintaining it. Let's look at the ISS as an example for maintenance. Every few...
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    How to ventilate a room with no windows with one inline fan?

    I might be able to help you a bit as part of my job as a civil engineer is designing sound walls to prevent traffic noises from disturbing residential neighborhoods. First thing to know is that you get a 5dB reduction in observable sound just by breaking line of site from the generator to the...
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    Do you have to be good at hand-drawing for civil engineering?

    Don't worry John, most engineering drawing are now done on computers. I have been a Civil Engineer for 3 years now working at a company with 40 other civil engineers. Other than rough sketches to quickly convey an idea to someone else, no one hand draws plans. It is unlikely that you will be...
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    I How to measure the surface area of an arbitrary 3D object

    you could use a 3D laser scanner to create a mesh of the object on a computer. From that you would easily get a surface area. https://pages.shanti.virginia.edu/medianet/2012/09/28/scan-big-with-the-faro-focus-3d/ You might even be able to use photos to make a 3d model but the accuracy would...
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    Reflection of only visible (safe) light on moon/mars

    As I understand it, Cosmic rays are mostly Alpha, Beta, and Neutron particles. Would any of these be coming from the ground (below the horizon)? or would these particles only travel on a direct path from above the horizon (with the exception of minor reflections off of positive or negatively...
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    Reflection of only visible (safe) light on moon/mars

    I have seen many articles lately regarding planned manned missions to the moon and Mars but the question of radiation protection constantly comes up. Engineers keep proposing various shelter designs that use local materials (regolith) as a concrete base to absorb harmful radiation so that the...
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