Echoing the sentiments of many in the science community, Fricker and Adusumilli said they are hopeful that the ICESat-2 data will lead to new discoveries about ice sheets and sea ice. Oct 04, The entire science team now awaits the trove of data that is bound to begin pouring in. This story appears in explorations now , Scripps Institution of Oceanography's award-winning ocean and earth science magazine.
Sign up to receive our free monthly story roundup. The Delta II launch vehicle offers the user a choice of three fairings: a 2. Each of these fairings can be used on either two-stage or three-stage missions. The stretched-length 3. The stretched 3-m ft -diameter composite fairing has a reshaped nose cone and a cylindrical section 0.
A pillar of the American aerospace industry for more than four decades, the RSA is second to none in its class featuring a mature engine design and demonstrated manufacturing processes. The RSA is a single-start, fixed thrust liquid bi-propellant gas generator cycle main engine and two vernier engines. In addition to providing vehicle roll control during flight, the vernier engines each contribute more than 1, pounds of thrust to the main engine. Six GEMs are ignited at liftoff; the remaining three GEMs, with extended nozzles, are ignited in flight after burnout of the first six.
Ordnance for the motor ignition and separation systems is fully redundant. The X and X vehicles include three or four GEMs respectively, all of which are ignited at liftoff. Both types of GEMs are flown with a fixed nozzle that is canted outboard from the vehicle centerline at 10 degrees.
That is one of the great things about Space Politics, thoughtful commentary and good, well sourced discussions. Let me guess. DoD has conveniently scheduled the procurement specifically to disqualify SpaceX, no doubt in a generous attempt to save SpaceX money? Ya think? They are enormously cheaper, and may be considered less reliable. Perhaps their capabilities are not quite comparable.
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Those facts are critical to the value equation, which the DoD needs to solve. But without a bid, there is nothing to solve! While Musk has focused on powered descent, which he intends to use in Deep Space, I do not know that this is the best method for ordinary launches. There are drogue parachutes, along with either folding wings rogallo wings. I do not know why SpaceX had problems with its drogue parachute. Their analysis is undoubtedly proprietary. A drogue chute will not do much for you.
Which means that the first stage gets destroyed way before that speed in its dive. You MUST stabilize it as early as possible. Folding wings??? On a classical first stage rocket? Nope not a chance. A rogallo wing??? Oh well. If you start talking wings you usually end up with scissor wing of some sort but it does not work either. Your center of mass is not where it needs to be. Unless you design some sort of TSTO two or three stage to orbit with a winged first stage you have little to no chance to make it work.
See Stratolauncher for example: First stage with wings everything else is a rocket. Even Shuttle first stage did not have wings and they tried, and tried, and tried to make one and tried some more. Search flyback booster. See the advanced Zenit studies for example. Therefore a drogue chute is useless at these velocities. Ummm…so you are saying the award of launches to a competitor of ULA should not be undertaken, as ULA will simply turnaround, as well they have the power to, and increase prices on their remaining manifest screwing the DoD? Cost plus after all.
AmericaSpace Imagery Team Capture Rare Launch of Venerable Delta II « AmericaSpace
No divorce. That would cost more! The billions apparently refer to issues concerning sub-contractors lost business, etc. Good news.
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Here is hoping some corrupt officials in the procurement department of the air force get in serious legal trouble over this. Not sure what that has to do with anything. It WAS a formal procurement. NASA endured two years of their missed milestones. Good riddance. With all due respect, Mr Musk does not have a vehicle that is qualified to the current requirements and there is no precedent to delay contractual competitions until all parties have developed their vehicles.
He may not understand that since his NASA contract was let before he had any successful launches, ie it was political not cost based. He should be somewhat careful, in the military world, unlike NASA, if you dont launch on time and successfully, you pay for the lost mission. In fact, the precedent is the other way.
The solicitation will not only specify that requirement but also usually state that the bidding period will not be extended to allow a bidder to do so. What is it about the Falcon 9 launchers that make them unqualified to the current requirements?
Delta-II STSS-RTRR Launch, May 5, 2009
Can you be specific? Their security certification is practically in hand. His vehicles are most certainly developed. Where have you been for the last four years and nine launches?
The last three launches were of an especially mature design. The Falcon 9 is qualified. Also, there was no reason for a 36 core, five year blockbuy other than to guarantee ula profits for that time. Boo hoo. And this guy wants to fly millions of people to Mars. High time Space X earned some genuine street cred in the space biz beyond following in the wake of Sputnik, Explorer I and other satellites launched over the past fifty years or so.
But then, LEO is a ticket to no place, going in circles, no where, fast. Wow, released out of stasis? The world has changed while you were gone, maybe you should look around and update yourself before starting to rehash your old arguments…. HYour own posting reveals nothing has chenged. You might as well acccept the remainder of the Obama years as free drift and muddling along with space policy. Twitching over how and why to go in circles, no where, fast is the make work for the next few years. You want street cred, take the risk and fly somebody.
Related US AIR FORCE FACT FILE DELTA II LAUNCH VEHICLE
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