27 Apr 2024, 09:42 [ UTC - 5; DST ]
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Post subject: Re: New Speed Record: 394,736 MPH Posted: 29 Oct 2023, 13:10 |
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Joined: 12/03/14 Posts: 19252 Post Likes: +23622 Company: Ciholas, Inc Location: KEHR
Aircraft: C560V
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Username Protected wrote: I wonder how hot this probe gets at the perihelion point (4.51 million miles from the surface of the Sun). "At closest approach to the Sun, while the front of Parker Solar Probe' solar shield faces temperatures approaching 2,600° Fahrenheit, or 1,400° Celsius, the spacecraft's payload will be near room temperature, at about 85° F." https://parkersolarprobe.jhuapl.edu/The ... /index.phpThe heat shield protects the spacecraft. If they lose orientation, the spacecraft will be destroyed in seconds. More about the thermal design of the probe: https://spectrum.ieee.org/how-the-parke ... th-the-sunMike C.
_________________ Email mikec (at) ciholas.com
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Post subject: Re: New Speed Record: 394,736 MPH Posted: 29 Oct 2023, 18:24 |
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Joined: 12/31/10 Posts: 319 Post Likes: +146
Aircraft: Bonanza G35, V35
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Wow! They use plain old water, distilled, to cool the photocells, not some exotic chemical fluid. Who would have "thunk".
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Post subject: Re: New Speed Record: 394,736 MPH Posted: 29 Oct 2023, 19:22 |
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Joined: 12/08/12 Posts: 848 Post Likes: +1016 Location: Ukiah, California
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Username Protected wrote: I wonder how hot this probe gets at the perihelion point (4.51 million miles from the surface of the Sun). "At closest approach to the Sun, while the front of Parker Solar Probe' solar shield faces temperatures approaching 2,600° Fahrenheit, or 1,400° Celsius, the spacecraft's payload will be near room temperature, at about 85° F." https://parkersolarprobe.jhuapl.edu/The ... /index.phpThe heat shield protects the spacecraft. If they lose orientation, the spacecraft will be destroyed in seconds. More about the thermal design of the probe: https://spectrum.ieee.org/how-the-parke ... th-the-sunMike C. Excellent, thank you! This is fascinating!
Dan
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Post subject: Re: New Speed Record: 394,736 MPH Posted: 29 Oct 2023, 23:42 |
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Joined: 08/17/15 Posts: 825 Post Likes: +435 Company: Looking Location: Hattiesburg, MS
Aircraft: Ex-King Air 350i
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Username Protected wrote: They need to make it go 1695 times faster. “Warp one. Engage!”
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Post subject: Re: New Speed Record: 394,736 MPH Posted: 30 Oct 2023, 11:06 |
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Joined: 12/08/12 Posts: 848 Post Likes: +1016 Location: Ukiah, California
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Username Protected wrote: Wow! They use plain old water, distilled, to cool the photocells, not some exotic chemical fluid. Who would have "thunk". I was surprised at that as well. No mention of using ethylene glycol which would have at least been a better anti-freeze solution (even though there is sophisticated management of potential freezing situations with the DI water). Dan
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Post subject: Re: New Speed Record: 394,736 MPH Posted: 30 Oct 2023, 11:33 |
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Joined: 11/03/08 Posts: 14584 Post Likes: +22970 Location: Peachtree City GA / Stoke-On-Trent UK
Aircraft: A33
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Username Protected wrote: I was surprised at that as well. No mention of using ethylene glycol which would have at least been a better anti-freeze solution (even though there is sophisticated management of potential freezing situations with the DI water). Dan maybe the amount of reduction in freezing point is insignificant in the context of the potential temperatures involved ? another thought, what happens to the big organic molecules forming the antifreeze, in that irradiated environment? I have no idea but I bet it warrants examination
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Post subject: Re: New Speed Record: 394,736 MPH Posted: 30 Oct 2023, 11:41 |
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Joined: 09/16/10 Posts: 8892 Post Likes: +1956
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Username Protected wrote: Wow! They use plain old water, distilled, to cool the photocells, not some exotic chemical fluid. Who would have "thunk". Don't underestimate the reach of the EPA.
_________________ If you think nobody cares about you. Try not paying your income tax.
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Post subject: Re: New Speed Record: 394,736 MPH Posted: 02 Nov 2023, 21:20 |
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Joined: 08/29/19 Posts: 7 Location: KTCL
Aircraft: Mooney M20J
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Username Protected wrote: Parker Solar Probe … and it continues to accelerate on each pass: https://blogs.nasa.gov/parkersolarprobe ... y-the-sun/Is it getting faster because with each pass it gets closer to the sun, or because of some kind of gravitational/tidal assist? I'm guessing that it gets closer because it's losing energy with each orbit?
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Post subject: Re: New Speed Record: 394,736 MPH Posted: 03 Nov 2023, 11:00 |
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Joined: 04/26/13 Posts: 19981 Post Likes: +19739 Location: Columbus , IN (KBAK)
Aircraft: 1968 Baron D55
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Username Protected wrote: Is it getting faster because with each pass it gets closer to the sun, or because of some kind of gravitational/tidal assist? I'm guessing that it gets closer because it's losing energy with each orbit? I don't think that its speed is increasing. In fact, this source indicates that it used a series of fly-bys of Venus to adjust its flight path and decelerate. It did approach closer to the sun over the first 1200 days, but it has remained stable since. https://parkersolarprobe.jhuapl.edu/The ... ere-Is-PSP
_________________ My last name rhymes with 'geese'.
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Post subject: Re: New Speed Record: 394,736 MPH Posted: 03 Nov 2023, 11:34 |
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Joined: 11/03/08 Posts: 14584 Post Likes: +22970 Location: Peachtree City GA / Stoke-On-Trent UK
Aircraft: A33
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so is this thing faster than the nuclear blast manhole cover ? I thought that was (accidentally) the fastest thing ever created by human hands ?
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Post subject: Re: New Speed Record: 394,736 MPH Posted: 03 Nov 2023, 11:44 |
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Joined: 04/07/18 Posts: 100 Post Likes: +38 Location: KMRY
Aircraft: Baron B55
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Username Protected wrote: so is this thing faster than the nuclear blast manhole cover ? I thought that was (accidentally) the fastest thing ever created by human hands ? https://en.wikipedia.org/wiki/Operation ... l_bore_cap"When Pascal-B was detonated, the blast went straight up the test shaft, launching the cap into the atmosphere at a speed of more than 66 km/s (41 mi/s; 240,000 km/h; 150,000 mph)." So definitely beat that record! That speed also feels like a guesstimate based on a single frame of available high-speed camera data. Not to mention that also it probably vaporized soon after, a whole lot less impressive to maintain that speed for a couple of seconds vs. years.
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Post subject: Re: New Speed Record: 394,736 MPH Posted: 03 Nov 2023, 11:50 |
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Joined: 12/03/14 Posts: 19252 Post Likes: +23622 Company: Ciholas, Inc Location: KEHR
Aircraft: C560V
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Username Protected wrote: Not to mention that also it probably vaporized soon after, a whole lot less impressive to maintain that speed for a couple of seconds vs. years. The Parker probe has significantly less indicated airspeed and thus a lot less drag. I doubt its KIAS is over 1 knot. But it isn't zero. Mike C.
_________________ Email mikec (at) ciholas.com
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