Starship: Take 2

 art, awesomeness, history, news, photography, rockets, spacecraft  No Responses »
Nov 182023
 

The second Starship/Superheavy launched today. Vastly more successful than the first flight, but both stages were still destroyed.

This sort of thing would be unacceptable for a modern NASA launch system… but it was common in early launch vehicle development. Atlas and Titan kerploded with regularity. This sort of thing is not desirable, but it is a natural part of the learning process.

Scott Manley has done an analysis of the video and has some good suggestions about what happened with the booster. There would seem likely to be some serious issues with slosh and propellant hammer effects, caused by the sudden deceleration and flip maneuver. These are resolvable.

But beyond the technical issues and successes… this flight was simply *gorgeous.*

 

 

 

 Posted by at 4:24 pm

Forced deflection nozzles for ICBMs

 drawings, Hmm..., nukes, projects, rockets, weapons  No Responses »
Oct 192023
 

There are several ways to accomplish the goal of extracting maximum performance from a solid rocket motor via the nozzle. The most common way – a convergent-divergent nozzle – is the standard for a reason: it’s the simplest, lightest most reliable way to do it. But there are alternatives that provide specific advantages. One of them is the “forced deflection nozzle.” Instead of a single circular throat, the nozzle has several; instead of directing the exhaust gas due aft, it forces it “sideways” to smack into the broader, shallower nozzle.

The advantages here:

1: The nozzle is sort of a hemispherical bowl, rather than a long, slim cone or paraboloid.

2: It provides some altitude compensation, similar to an aerospike.

There are also disadvantages, not least of which is that the throat is now under substantially greater thermal and dynamic forces. Few materials known to Man will be able to long withstand the high heat load and erosive forces. But in 1986, Aerojet proposed to develop such a nozzle for a singular purpose: to integrate into future ICBMs. The reasoning was… the bowl-like nozzle fits the bowl-like forward dome of the lower stage. Instead of a long interstage structure being required, the stages fit together neatly. in principle this would allow ballistic missiles to be more compact, shorter by useful distances. This is not very important for space launchers, but for missiles that need to fit into silos, submarines, bomb bays or Shuttle cargo bays, extra space means extra capacity.

 

Ā 

Diagram showing a conventional 3-stage solid rocket ICBM against three concepts making use of the forced deflection nozzle. You could have a much shorter vehicle with equivalent weight and payload, or same-length boosters with 28.4% greater range for the same payload, or 33% greater payload for the same range.

 Posted by at 9:02 pm

Yet another war

 AARRRGH, Crazy, dumbassery, Gah., news, politics, religion, rockets, ą² _ą²   No Responses »
Oct 072023
 

“Palestinians” decided it would be not only a good idea to launch thousands of rockets into Israel, but to send a large number of invaders into Israel to slaughter civilians. I’m not sure what they thought they’d gain from this; it sure as hell won’t be the overthrow of Israel. Perhaps it will be the conversion of Gaza into a depopulated buffer zone.

 

Israel In ‘State Of War’ After Hamas Fires 5,000 Rockets In “First Strike”

 

 

 

 

 

 

 

 Posted by at 1:44 am

August 2023 Rewards

 aircraft, art, CAD diagrams, drawings, history, Monthly Historical Documents Program, new products, projects, rockets, spacecraft  No Responses »
Sep 012023
 

The rewards for August, 2023, have been released. They include:

Document: Report No. ZD-013, “Preliminary Detail Specification for United States Navy Class VP Long Range Patrol Seaplane,” Convair, 1 April 1946

Document: “Space Shuttle: What Will It Do?” A 1970’s brochure describing the Shuttle, with six full-color full page illustrations

Art: McDonnell-Douglas lithograph of “NASA Earth Orbital Space Station”

CAD Diagram: Northrop Grumman Next Generation Long Range Strike

 

If you would like to help fund the acquisition and preservation of such things, along with getting high quality scans for yourself, please consider signing on either for the APR Patreon or the APR Monthly Historical Documents Program. Back issues are available for purchase by patrons and subscribers.



 

 

And as happens far too often, I’ve been remiss in my PR campaign. The rewards for July, released a month ago, included:

Document: “C-5 Galaxy Pocket Guide,” brochure giving info on the C-5

Document: GDIC-64 O29-21, “Alighting Gear Convair Model 48 Light Armed Reconnaissance Airplane,” an illustrated report on the landing gear for Convairs competitor for the OV-10

Document: “Police Department Lecture #3 Effects of Atomic Weapons,” an early-50’s paper describing what NYC could expect int he event of a nuclear strike

Diagram: EMW “Wasserfall,” German WWII surface to air guided missile

CAD Diagram: Boeing 2707-100-derived bomber

 

 Posted by at 1:43 am

Someone needs to clean house

 AARRRGH, Crazy, dumbassery, Forward!, Gah., news, politics, rockets, spacecraft, Worldwreckers, ą² _ą²   No Responses »
Aug 242023
 

US Justice Dept sues SpaceX over hiring practices

 

ā€œOur investigation found that SpaceX failed to fairly consider or hire asylees and refugees because of their citizenship status and imposed what amounted to a ban on their hire regardless of their qualification, in violation of federal law,ā€ Assistant Attorney General Kristen Clarke said.

 

How about No. SpaceX is building the future of national security. I say let them be as got-dayum picky as they want to be *especially* when it comes to hiring people of dubious loyalty.

The next time we get a President who is non-insane, non-senile and pro-America, they need to go through the halls of the Federal Government withĀ  leafblower hooked up to a backpack full of pink slips.

 Posted by at 8:18 pm

Recent acquisitions

 aircraft, art, awesomeness, drawings, eBay, history, Monthly Historical Documents Program, news, Patreon, projects, rockets, spacecraft  No Responses »
Aug 182023
 

Thanks to ebay and my fabulously lean bank account, I have recently procured a number of items of potential interest:

“NASA Earth Orbital Space Station,” a poster-sized lithograph from McDonnell Douglas depicting a space station that tumbles for artificial-G.

“Re-Entry Payload Launch Vehicle,”Ā  A *brief* General Dynamics presentation on a vehicle to launch re-entry vehicles such as MIRV warhead shapes

 

“Proposed Development Program on Rocket-Type Missiles,” a 1948 Convair report on early ballistic/boost glide missile concepts, that would lead to Atlas. Includes some fantastic large format layout diagrams.

 

“Detail Specification for Consolidated Vultee Model 117 Airplane Class VR Transport Flying Boat,” August 1950, all the details on the then-brand new Tradewind.

 

 

“Detail Specification for Class VP Long Range Patrol Seaplane,” Consolidated Vultee 1946, all the details on a proposed flying boat patrol/bomber

32 issues of “Astronautics” magazine from 1957 to 1969, mostly 57-59 and 63 or so.

The lithograph and the reports will be scanned and put forward for consideration for monthly rewards; the magazines will have the interesting bits scanned and made available to the subscribers/patrons.

 Posted by at 11:02 pm

$200 a round rocketgun

 awesomeness, blather, history, Hmm..., rockets, spacecraft, weapons, youtube  No Responses »
Aug 162023
 

Here’s something you don’t see too often… someone firing *numerous* rounds from a Gyrojet. Each of these .45 caliber rounds are solid propellant rocket units, last manufactured in the 70’s or so. They apparently run about $200 *each,* which makes me wonder if there might be a market for newly manufactured ammo. As a practicalĀ  home defense, police or military weapon… the Gyrojet basically wasn’t. It took something like 50 feet for the round to reach maximum velocity, which means at close range it might just bounce off an opponent. But as a range toy they might be fun, especially if the cost per round could be dropped substantially. And there’s no reason why it can’t… sure, each round is more complex than an equivalent conventional bullet, but they are just some basic parts with 1960’s rocket propellant. And that last could doubtless be improved; better propellant, better grain design and better manufacturing of the nozzle plate could *really* boost performance.

The claim is made here that the Gyrojet was designed to be used in space because they were uncertain if conventional gunpowder firearms would work in a vacuum. This is untrue; nobody with the least bit of understanding of the chemistry of gunpowder and how guns work thinks that guns *won’t* work in space. However, conventional firearms do have three major issues for space applications:

  1. Recoil.
  2. Thermal issues: exposure to sunlight and vacuum means that small metal devices like guns heat up *fast.*
  3. Vacuum issues: grease, gun oil and the like boil off quick, meaning they can’t be used in space.

 

The Gyrojet has far lower recoil than conventional firearms. And the Gyrojet is a far simpler mechanism, made largely from stamped metal sheet to far lower specifications. This means it can heat up without jamming, with virtually no need for lubricants. So the Gyrojet seems like it’d make a dandy sidearm for the USSF. Bump it up to .75 caliber and you have yourself a light bolter. And perhaps best: home manufacture of Gyrojets would be *easy.* A 3D printed Gyrojet, with some *basic* metal parts, would not only be easy to make, but with vastly lower forces imparted on it than a conventional firearm, it’d be far less likely to explode.

 

So… where are the new-manufacture Gyrojet rounds? At $200 a round for the vintage stuff, you can start off *real* expensive and still undercut the current market.

 

 Posted by at 6:52 am

KSC Master Plan

 awesomeness, books, history, Monthly Historical Documents Program, Patreon, rockets, spacecraft  No Responses »
Aug 102023
 

Recently acquired at some cost, and finally fully scanned at some effort, is this 1965 “Master Plan” for Kennedy Space Center. It’s basically a book of maps of the region showing all aspect of the infrastructure. It’s in good shape and was scanned at 600 DPI rather than the usual 300, due to the fine quality of the maps. It will be in the next catalog for Patrons and Subscribers to vote on. It’s a little out of the usual for APR… it’s not about unbuilt aircraft or spacecraft; in fact, no aircraft or spacecraft designs are included. But it’s still an interesting historical artifact.

I also have a KSC Master Plan from the Shuttle era. Substantially larger format, with more conventional full-color maps. I haven’t scanned that due to the chore it would be to get done, but if this proves popular, I’ll get on it. I *also* have a large-format Master Plan for Ames Research Center.

 

If you are interested, check out the Historical Documents Program.

 

 

 Posted by at 11:46 pm

The best of all possible worlds

 awesomeness, blather, Hmm..., news, rockets, science, spacecraft  No Responses »
Aug 022023
 

If LK-99 pans out as a true room temperature superconductor, it really does seem like it’ll be world changing. That’ll be great: no more need to cryo-cool electromagnets, making maglevs practical and making CAT scanners and the like a hell of a lot cheaper. And making the nightmare scenario of running out of helium much less nightmarish. They’ll make electric motors run cooler and more efficiently and, so I’m led to understand, rings of superconductors can be fed vast amounts of electricity which will losslessy just zip around the ring until called upon. More complex than a battery, but with the potential for *vast* energy densities. At last electric cars might be truly practical: an energy storage system allowing for a thousand miles range and the ability to be recharged in minutes rather than hours, using storage systems based on *lead* rather than rare earths. What’s not to like?

Some preliminary studies by independent labs suggest that at least some aspect of LK-99 are panning out, though nobody is ready to declare victory just yet. And even if the stuff works as advertised, to become truly useful it’ll need to be manufactured at high quality on an industrial scale.We don;t know squadoo about doing that just now. It might turn out to be easy enough for laymen to whip up batches of the stuff. it might turn out to be very difficult.

Here is what I think would be the absolutely best scenario: it’s possible to make the stuff to *adequate* quality on industrial scales, but it’s difficult and expensive. Unless… manufacturing takes place in microgravity. Then the stuff comes in with glorious quality and reliability. This would not only make the world better for all the reasons that the superconductor would, it would kick off space industrialization. Woo.

I would, however, be satisfied with the stuff working and being ground-manufacturable. Decades ago the Shuttle was supposed to kick off space industrialization via microgravity manufacturing of crystals and pharmaceuticals, but people figured out how to make that stuff on the ground.

 Posted by at 10:52 pm
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