It looks like the sound insulation is applied in the form of individual panels which have some kind of bright reflective edging. Does anyone know why that would be? The more obvious way to do it would be to spray foam on the inside, as was done on the outside of the Space Shuttle external tank.I'm impressed that there appears to be almost no charring. They're down to the last 50 m/s. Pretty nice.
New instagram post from Elon Musk:https://www.instagram.com/p/BiQ5qXnA_OM/?taken-by=elonmusk
Quote from: Lars-J on 05/02/2018 06:09 amNew instagram post from Elon Musk:https://www.instagram.com/p/BiQ5qXnA_OM/?taken-by=elonmuskIs it traveling wrong-end-first? I had pictured the top of the fairing headed into the wind.
It looks like the sound insulation is applied in the form of individual panels which have some kind of bright reflective edging. Does anyone know why that would be? The more obvious way to do it would be to spray foam on the inside, as was done on the outside of the Space Shuttle external tank.
Quote from: mattstep on 05/02/2018 11:58 amQuote from: Lars-J on 05/02/2018 06:09 amNew instagram post from Elon Musk:https://www.instagram.com/p/BiQ5qXnA_OM/?taken-by=elonmuskIs it traveling wrong-end-first? I had pictured the top of the fairing headed into the wind.You assume a direction of flight into the center of the frame. But it might as well be heading out of frame.
Long time lurker, first time poster...I'm a paraglider pilot and my first reaction to the instagram photo is that it is travelling out of frame. A paraglider has a curved leading edge and often a more or less strait trailing edge. The curved leading edge gives the glider inherent yaw stability.I think we can see the curved leading edge in the photo.
Quote from: IainMcClatchie on 04/26/2018 11:48 pmIt looks like the sound insulation is applied in the form of individual panels which have some kind of bright reflective edging. Does anyone know why that would be? The more obvious way to do it would be to spray foam on the inside, as was done on the outside of the Space Shuttle external tank.Yeah, that would make a nice and clean environment for spacecraft
Below 1KHz a foam layer would be 13 inches thick to be 1 wavelength thick.
As another point, filling the fairing with Xenon about halves the speed of sound, and filling it with R22 approaches a third.
Quote from: speedevil on 05/03/2018 12:02 pmAs another point, filling the fairing with Xenon about halves the speed of sound, and filling it with R22 approaches a third.Isn't Xenon pretty expensive? Would filling that big volume cost more than the fairing itself, and not be recoverable?
Quote from: Lars-J on 05/02/2018 06:09 amNew instagram post from Elon Musk: https://www.instagram.com/p/BiQ5qXnA_OM/?taken-by=elonmuskDo we know from which mission is that landing?
New instagram post from Elon Musk: https://www.instagram.com/p/BiQ5qXnA_OM/?taken-by=elonmusk
Quote from: john smith 19 on 05/03/2018 06:36 amBelow 1KHz a foam layer would be 13 inches thick to be 1 wavelength thick. This assumes the speed of sound in porous absorbers is 340m/s.This thread claims 111m/s or so may be more realistic, and gives some references I haven't chased up in the literature.As another point, filling the fairing with Xenon about halves the speed of sound, and filling it with R22 approaches a third.Evacuation makes the fairing unfortunately heavier.For a 5.4m diameter fairing, that's around the equivalent stresswise of the whole rocket sitting on it, admittedly symmetrically, but it's going to get quite a lot heavier.