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David W. Knisely . . . . . . "If you aren't having fun in this hobby, you aren't doing it right." Hyde Memorial Observatory http://www.hydeobservatory.info Prairie Astronomy Club http://www.prairieastronomyclub.org
Quote:This thing just keeps getting better and better! I kept wanting to say, "KEEP GOING!" as it reached full altitude, but I guess they wanted to land the thing and not drop a stage on anyone . Congrats to SpaceX for another fine achievement.
Indiana for a three more weeks...
14.5" Teeter w/ Richard Fagin mirror, TT #66
EON 120ED on CG-5 ASGT
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Denk Super System with A45 OCS
"Starman" Dan Doyle
Texas Astronomical Society of Dallas
Central Texas Astronomical Society
8" LX200GPS w/ST80 guidescope, Canon 350D+DSI Pro
150mm f/8 Sky Watcher Refractor
10" f/4.5 Homemade Dob RV-6 Criterion Dynascope http://www.darcstarobservatory.webs.com
Quote:While very cool, I wonder why Elon is perusing this method of recovery.
CG5ASGT Astro-Tech AT6RC Zhumell 10 inch dob deluxe kit 10x12 observatory Echo Astronomy maker of Custom bahtinov masks and Duncan collimation masks.
15x70-Ultra~TV-85/SM-60~MN-66~12.5"dobsonian Unistar Deluxe~Unimount Light~DM-6/Planet tripod
Quote:What use is this?
Quote:While very cool, I wonder why Elon is perusing this method of recovery. Seems to me a powered vertical landing system is much riskier than other forms of recovery. What happens when the decent stage gives out 100 feet from touchdown? Why not parachute the ascent stage down? It could even be GPS controlled and landed in a large, man made lake as opposed to the open ocean.
Quote:What use is this?
"Scientists aren't perfect, just peer reviewed.""Eye of Sauron Observatory", featuring "Sauron's Other Eye", 16" dob, conical Royce mirror.
Quote:That was really cool. Looked fake - like an animation. Are you sure it wasn't?
Quote:That was really cool. Looked fake - like an animation. Are you sure it wasn't?Also, reminded me of Lunar Lander on the GT40. Anyone remember that?/Ira
Huh?? It didn't look even remotely like a fake to me.
Quote:It's more than just that. The whole scene looks uber real, too real to be real. Also the angle it was shot at adds to the sense of "animation". It was partially shot from above. How'd they do that?
Quote:I still do not understand what good will come of such a vehicle.
Quote:Quote:I still do not understand what good will come of such a vehicle.Did you read what I wrote in my third post in this thread?
Quote:Quote:Quote:I still do not understand what good will come of such a vehicle.Did you read what I wrote in my third post in this thread? It's a pretty simple concept. As Musk said, "You don't throw away a brand new 747 after every flight."
"Many a night I saw the Pleiads, rising thro' the mellow shade, Glitter like a swarm of fire-flies tangled in a silver braid." Tennyson: Locksley Hall
"The truth rarely gets in the way of a good story. ~ R. Woods
Quote:The obvious disadvantage is that having the booster land under its own power requires propellant that won't be available to lift the payload. However, there is usually extra margin for most payloads. Also, the returning booster hasn't all the mass of the upper stage and payload and the spent propellant to lift. I haven't run any numbers, but I'd make a SWAG that returning to launch site or other recovery area would need about 15 to 20% of the propellant. A tradeoff. Sacrifice some payload mass to recover a 150 million dollar booster? Worth it, I'd say.
Quote:From the video, I suspect it will need to be thrusting continuously to maintain attitude control. I think if it cut thrust completely and fell at terminal velocity it would probably start tumbling, then resuming controlled thrust would be difficult. Maybe in combination with some drag chutes or something...It was impressive how it maintained balance on top of just a single engine.Jarad
My gear: --Celestron 8EdgeHD & 11EdgeHD | 80mm F/6 Triplet | Modified Canon T1i | QSI683WSG-8 | Celestron AVX mount | iOptron CEM60 mount | iOptron ZEQ25 mount --- My skies: