Monday, January 30, 2012

Tumbling rockets

Tumbling Rockets from Ralf Vandebergh on Vimeo.


Presentation of pioneering imagery in the project called 'Tumbling Rockets''. Contains some examples of obtained high resolution imagery of tumbling orbiting Rocket Stages using a 10 inch telescope during the years 2010/2011.

Featured objects are:

1) Tumbling Aureole-2 rocket from 1973 launch, one of oldest still tumbling objects in orbit.

2) Tumbling Soyuz rocket upper stage, launched Soyuz TMA-19 to the ISS

3) Tumbling Spektr-R rocket, a Zenit 2 seconds stage which launched the Spektr-R radiotelescope into a high orbit. This original unprocessed video of images shows a very rare capture of this rocket passing through the telescopic field of view

4) The Nanosail-D solar sail captured tumbling in Earth orbit. This is a bonus which has indirectly to do with the tumbling debris like rockets, due to its demonstration technological purposes. Nanosail is used to demonstrate future technology were sails could possibly be used to manage faster decay of satellites and debris.

Credit/Copyright: Ralf Vandebergh

A Realistic Interstellar Explorer



1.0 Introduction

"For more than 20 years, an “Interstellar Precursor Mission” has been discussed as a high priority for our understanding (1) the interstellar medium and its implications for the origin and evolution of matter in the Galaxy, (2) the structure of the heliosphere and its interaction with the interstellar environment, and (3) fundamental astrophysical processes that can be sampled in situ.

The chief difficulty with actually carrying out such a mission is the need for reaching significant penetration into the interstellar medium (~1000 Astronomical Units (AU1)) within the working lifetime of the initiators (50 years). During the last two years there has been renewed interest in actually sending a probe to another star system - a "grand challenge" for NASA - and the idea of a precursor mission has been renewed as a beginning step in a roadmap to achieve this goal.

Ongoing studies now being carried out by the Jet Propulsion Laboratory (JPL) in conjunction with a NASA-selected Interstellar Probe Science and Technology Definition Team (IPSTDT) are focused on the use of solar sails to achieve a more modest goal of ~400 AU in 20 years with a requirement of reaching at least 200 AU. This approach, as well as all of those previously considered, obtains significant solar-system escape speeds by “dropping” the probe into the Sun and then executing a DV maneuver at perihelion. In the solar sail approach, the sail is used first to remove the angular speed of the Earth and probe about the Sun; the sail is then maneuvered face-on into the Sun at 0.1 to 0.25 AU (set by sail thermal heating constraints), and solar radiation pressure accelerates the probe away from the Sun until the sail is jettisoned (at ~5 AU in the ongoing studies). The previous approaches, and that adopted for study here, initially send the probe out to Jupiter, using that planet's gravity to remove the probe angular momentum. The probe is then allowed to fall much closer to the Sun - in this case to 4 solar radii (RS 1) - where a large propulsive DV maneuver is required over a very short time - taken here to be ~15 minutes to minimize gravity losses. At this time all acceleration is over and the probe continues on a high-energy ballistic escape trajectory from the solar system.

In the scenario studied in our Phase I work, the use of a carbon-carbon thermal shield and an exotic propulsion system capable of delivering high specific impulse (Isp) at high thrust is enabling. For the NASA/JPL case, the manufacture, deployment, and management of long-term low-thrust maneuvering with a solar sail is the enabling propulsive technology. Both implementations require low-mass, highly integrated spacecraft in order to make use of moderate (Delta-class) expendable launch vehicles (ELVs). The further from the Sun that operation is required, the more stressing are the reliability requirements for the spacecraft itself. Our Phase I concept is baselined to operate at least 2.5 times as far from the Sun as the goal for the JPL study (1000 AU versus 400 AU) and contains system-architecture elements required as next-roadmap step after the sail mission - our probe design is largely independent of the propulsion means, whether those studied previously by us, solar sails, or others. In the Phase I work we have completed an initial scoping of the system requirements and have identified system drivers for actually implementing such a mission.

In this Phase I study we began the task of looking seriously at the spacecraft mechanical, propulsion, and thermal constraints involved in escaping the solar system at high speed by executing a DV maneuver close to the Sun. In particular, to fully realize the potential of this scenario, the required DV maneuver of ~10 to 15 km/s in the thermal environment of ~4 RS (from the center of the Sun) remains challenging. Two possible techniques for achieving high thrust levels near the Sun are: (1) using solar heating of gas propellant, and (2) using a scaled-down Orion (nuclear external combustion) approach. We investigated architectures that, combined with miniaturized avionics and miniaturized instruments, enable such a mission to be launched on a vehicle with characteristics not exceeding those of a Delta III. This systems approach for such an Interstellar Explorer has not been previously used to address all of these relevant engineering questions but is required to lead to (1) a probe concept that can be implemented following a successful Solar Probe mission (concluding around 2010), and (2) system components and approaches for autonomous operation of other deep-space probes within the solar system during the 2010 to 2050 time frame."

This paper is an excellent 30 minute read. The design of a Sun diver mission, used to greatly accelerate a spacecraft on an escape trajectory from the Solar System, is clearly very difficult. There are lots of challenges, including the question of how to protect the spacecraft from exposure to the environment within several radii of the Sun. Communication is another issue, as is weight savings. A spacecraft of only 50, 75, or 100 kg is required so that propulsion demands are not excessive. Even still, a change in velocity of 10 to 15 km/sec is required in a 15 minute interval. This is massive by normal standards, and will result in a 50 km/sec or greater escape velocity from the Sun. Burning within the gravity well of the Sun, after diving into the Sun from either Jupiter or the Earth, allows for a great amplification of the delta v rocket burn. Various methods could achieve the needed thrust, but not chemical rockets. Solar sails have always been an attractive alternative, as are ion propulsion systems, and nuclear pulse (orion type) rockets. In this paper, a method of collecting solar radiation (extremely powerful at this range) to heat a gas such as ammonia. Hydrogen would work better, but does not store well on long (ca 5 years) missions particularly when the heat on approach to the Sun is taken into account. This would be an ideal propulsion method because it can achieve the high ISP of ion propulsion, but also have higher thrust. Ion engines are not likely to burn quickly enough to work in only 15 minutes. In the end, only the solar-thermal option appears to work in a sun-diver mission. Perhaps this could be augmented with the use of solar sails in a hybrid mission.

Phase I Final Report - NASA Institute for Advanced Concepts: A Realistic Interstellar Explorer

Saturday, January 28, 2012

Can a lighter-than-air spacecraft enter orbit?


Among many other relevant technologies, JP Aerospace is investigating the use of low thrust, high ISP ion thrusters to accelerate their spacecraft from near space to orbit. These are not traditional rockets made out of metal, but rather lighter-than-air spacecraft which float to high altitude (over 100,000 feet) and then slowly accelerate and climb to orbit using propellers and later plasma rockets. This kind of flight is slow, but also gentle and quite inexpensive once the system gets working. A minimal amount of fuel is required because much of the lift and propulsion is done using lift gas and solar power. When fuel is consumed, perhaps xenon for the plasma engines, it is burnt at a very high isp, so that only a few kg are required to orbit payloads. In addition to orbital craft, there are plans for massive high-altitude stations where astronauts can live for extended periods. Payloads can be held here for staging to orbital craft as well. Once in orbit, the craft can drop payload, and slowly return to the Earth. Because reentry is gradual, there may be ways to prevent the high-energy reentry with the requisite heat and deceleration. If this can be done, the spacecraft can reenter deep space, rendezvous with the large floating station, and pick up a new payload. Refueling can be accomplished by transferring minimal amounts, dozens of kg perhaps, of propellant.

See more about this specific project here.

Friday, January 27, 2012

Reaction research society two stage rocket



One problem with having over 1000 posts is that I can't remember if this is a repost or not. I think this rocket was mentioned previously, either while talking about the never flown 4 O 10,000 to 1 O 10,000 Kosdon project, or perhaps talking about Project Farside. If anyone can remember, post in the comments. Flying such a configuration helps if you want to stick to smaller, more reliable motors rather than giant motors of new design. This comes at the cost of reduced mass fractions and increased drag.

"On 17 October, 2009 a two stage rocket consisting of a cluster of four standard RRS “class” motors in the first stage and a single “class” motor for the second stage (Figure 1) was flown at the Mojave Test Area. Pre-flight modeling suggested a peak altitude of about 45,000 feet and a maximum velocity of about Mach 2.5. Available data indicate that a partial failure of the nose cone attachment resulted in “cocking” of the nose cone and subsequent “coning” of the vehicle as it accelerated. The coning in turn resulted in a trajectory that headed approximately southeastwardly rather than in the planned southwest (downrange) direction. Analysis of video of the second stage burn allows the performance of the rocket to be constrained to a probable burnout velocity above 1700 feet / second at about 6900 feet altitude. Six DOF modeling suggests a maximum altitude of at least 13,000 feet."

More here.

Vesta!


Credit: NASA/JPL-Caltech/UCLA/MPS/DLR/IDA

Thursday, January 26, 2012

Project High Jump Boosted Dart






How do I always miss the great projects?

Here is video footage of the attempt:



The motor failed during burn, resulting in a shred and recovery failures. This flight was one of several proposed Carmack 100kft projects. You can read more about these projects here.

The specs for Project High Jump are:

Boosted Dart configuration
4" dia 36,000ns Booster
Case bonded
Double Taper Core
Booster 7' 4" Overall length
Welded Fin Can

Dart Configuration
1.5" dia
40" Length
Fins Welded to tube

Raven Altimeters in booster and Dart
Big Red Bee 2 meter high power GPS telemetry

A boosted dart is a small, dense dart that is attached to a larger booster. On burnout the dart flies free, and is optimally designed to coast very well. Darts are dense, thin, and usually have a boat tail on the bottom. Boat tails greatly reduce base drag in the lower atmosphere, and are something like a backwards nosecone. When a rocket has a built-in motor, there is severe base drag because the bottom is typically a flat, abrupt ending to the rocket.

Boosted dart apogees can be twice as high as a regular rocket of similar impulse, perhaps higher. In one example, the Reaction Research Society (RRS) launched an R motor boosted dart that hit nearly 100 KM altitude despite burning out at about 10,000 feet. That tiny dart coasted at 4,500 fps in dense lower atmosphere, yet almost made space despite that. The dart coasted for about 50 miles! A full-sized R motor would have been lucky to get as high as 100,000 feet if it had to fly as one unit simply because drag is so serious at low altitude. By comparison, rockets typically need to hit mach 5 and 40,000 feet to get space. Darts can do it from miles lower.

It is logical to use a boosted dart for a "simple" goal like getting electronics over 100,000 feet. It is cheaper than a giant motor (the Q motor that did break 100,000 feet) and less complex than a two stage rocket. The N5800 motor is a bit slow burning for a dart, but it would certainly be enough to get a dart above 100,000 feet under the right conditions. In this case, the booster was a thin O motor that could have done a bit better than the N5800, but reliability matters also.

More images here

Solid Propellant Burn Rate Enhancement in Rocketry

A REVIEW OF SOLID PROPELLANT BURN RATE ENHANCEMENT BY MECHANICAL METHODS

DAVID REESE

Abstract. The inclusion of metal fibers in a solid propellant grain has been shown to increase its bulk burning rate dramatically, and is a technology that was applied in several early sounding rockets. This review covers historical and current applications for the technology, as well as the theoretical basis for burning rate enhancement. Though technically successful, the use of wires to achieve high burning rates has largely been replaced with the use of reactive catalysts and other high burning rate energetic materials. However, recent concern over the sensitivity of such propellants is generating interest in other means of accelerating burn rates. As such, several practical research topics involving wire enhancement of burning rates are presented to reintroduce this technology into the motor designer’s toolbox.

TDK Propulsion

Saturday, January 21, 2012

The Libya Rocketry Association


"I am working on a plan to make (tourist rocket sport) in Libya and open the door for the world amateur rocketry to come over and shoot their rockets with me on the Libyan desert and by the sea side..."

I have to admit that I get bad flashbacks when I think about amateur rockets in Libya considering the violence last year, not to mention the typical role of rockets in northern Africa, but if the goals of this association are to practice rocketry for the sake of science and exploration, it is a good thing. Before I hold Libya to excessively high standards, let's not forget that American rocketry started (and remains) largely a military matter. Maybe if more people flew rockets for hobby, the World would be better.

http://rocketlibyan.blogspot.com/

Thursday, January 19, 2012

Post number 1000


Despite being around for many years, this blog has only today arrived at the 1000th post. Most of these posts have come in just the last three years. Thanks to all the loyal readers; without your interest, the minuscule Google payments alone would not justify maintaining a regular post rate. The picture above may perhaps be the best in the history of rocketry. It is a 4 stage, 10 motor rockoon, accelerating with something like a 75 to 1 thrust ratio on it's way to space. The rocket has just flown directly through a giant helium balloon, piercing it in two places the way a bullet would pass through a soap bubble. The rocket is so fast that the balloon has not yet collapsed. This image encompasses all that is great about rocketry. The farside project was complex, risky, expensive, and damn fast. The upper stage was expected to hit more than 17,000 mph, and top out at an apogee of thousands of miles. That giant balloon contained 3.75 million cubic feet of lift gas. After getting this rockoon to work, there was a tentative plan to use an extra stage to launch payloads at the Moon!

This is the substance of rocketry. This is why rocketry and space exploration will always have a central place in my life. In other words, get ready for the next thousand posts. Soon enough, I will start a new rocket project and attempt level 2 certification in the spring.

Just because this picture is so great, I decided to throw in a Hayden Planetarium (the sphere within the glass building) for scale. It is a bit less than half the diameter, and 1/10th the volume of the balloon used for this project. (Spheres are so strange.)

You can read more about Project Farside here, here, and here.

Wednesday, January 18, 2012

March to the Moon image archive



Gemini images
Mercury images

Google+ Hangout: Phobos-Grunt re-entry



On January 15, 2012, the Russian spacecraft Phobos-Grunt re-entered over the Pacific ocean and burned up. During this time, I reported the event live with Planetary Society science journalist Emily Lakdawalla on a Google+ Hangout.

So what has Phobos-Grunt been up to?



The final landing zone was in the Pacific. If you were the gambling sort you would tend to guess the Pacific for any object crashing into the Earth simply because it is the largest single target. On an unrelated note, if you are the gambling sort and want to borrow money at 10 points vig per week, let me know.

Tuesday, January 17, 2012

Onboard footage from N altitude flight



Video footage - lots of spin!

I bet this rocket would have broken 50,000 feet, possibly 10 miles even, without the conning and spin.

Sunday, January 15, 2012

Phobos Grunt has crash-landed back to Earth



The odds of recovering any pieces are slim.

Phobos-Grunt plunged to Earth into the Pacific Ocean on Jan 15, 2012 - Predicted Crash Zone

Maps shows orbital track of Phobos-Grunt on Final Orbit before crashing to Earth in the Pacific Ocean west of South America on Jan 15, 2012. Atlantic Ocean was at the center of the predicted crash zone after fiery reentry of Russia’s Phobos Grunt spacecraft. Credit: Roscosmos

The Restart Page - Reboot under different OSes

http://www.therestartpage.com/

Soviet lunar landing

Giant Leap Mariah 38 on Ebay



This is very tempting, particularly to buy and use for my first dual deploy experiments, but even a lowball offer ($120) seems like too much. I plan to build a level 2 cert rocket next month - and it will be a 3" x 78" all fiberglass rocket for a total cost of about $140.

Ebay Listing - ending in only 9 hours.

Friday, January 13, 2012

Al the rage?



This typo has resulted in thousands of hits, possibly because people are searching for "al the rage" by accident, and this comes up first. I have since fixed the title of the post, but to keep from losing the hits, I have made the title of this post "al the rage" as in "al the rage in Japan."

Tuesday, January 10, 2012

Massive MLRS salvo

USB pen camera




This camera was $16 shipped from Ebay. It comes with an 8 gig internal card, and actually works as a pen if you would want to be a spy. The size of the thing, and the fact that it has a bunch of holes all over the side, may get you in trouble with the KGB or Mafia to be honest. But since my brain does rocketry most of the time, I see this as a great little parasite camera. More aerodynamic than my other keychain camera, if somewhat heavy. But better still, it points sideways while my other camera points down. So they really complement each other. Indeed it would be fun to get two videos from one flight, and run them side-by-side in a youtube video.

Two issues remain. First, it is heavy and made out of metal bits. I wonder how the RSO will feel about that? And also, there is a power switch at the top that may be engaged during flight. With some testing, it should become clear how well it works.

PS check out the two "Gum-sticd Recirder Manual" packets included! The instructions are usually very hard to follow for these cameras, but clearly that is because the person making them does not speak English as a primary language. It is still better than my guides in mandarin...

Saturday, January 7, 2012

Computer parts have arrived!





After a few hours, the basic hardware has been installed and Windows 7 is in also. Tomorrow I will have to get the networking up and do all of the updates, downloads, etc. The Antec Sonata is exceptionally quiet, as is the stock cooler from Intel. Things were not perfect, and as always there are some issues. Antec included the usual MOBO pegs, but one of the four pre-installed had a flaw and basically got jammed, unscrewing itself as the mobo screw went in. After installing the board, and the cpu, I had to remove the MOBO and use pliers to get the faulty peg off! That is not exactly what one wants to do with a motherboard and cpu.

Antec has added an SSD mounting point, as have other case companies. This is too close to the side, and is utterly incompatible with the two SATA cables from MSI. The cables just don't fit when the drive is installed in either configuration, so for now it is just hanging out. Lastly, the mounting clips for the optical drive had two nice holes to line things up, but they were blocked with plastic. This was fixed by melting the plastic with a small screwdriver. Again not really the way things should be, but this last problem was expected because most of the Newegg reviews mentioned it.

For anyone who is looking to install Windows 7, consider the advice here. The author talks about optimization as well as tweaks that prove useful if you have an SSD. For example, windows started out with an 8 gig hibernation file (I turned hibernation off and got it all back) as well as 8 gigs of pagefile (I took that down to 1 gig.)

Once things are all set, I will have to copy a ton (about 1.2 TB) of files. This will take days and will require swapping HDDs back and forth between two computers, and probably actually erasing one HDD and using it over again to move from an old ATA drive that cannot work with the new motherboard. And then when the computer is completed, I will post some stats, benchmarks, and maybe calculate pi for a spell and see how it does. The computer should be able to do pi to 1 billion places in about 10 minutes, using nearly 5 gigs of ram!

Friday, January 6, 2012

This Girl Snuck Into a Russian Military Rocket Factory





"Her name is Lana Sator and she snuck into one of NPO Energomash factories outside of Moscow. Her photos are amazing, like sets straight out of Star Wars or Alien. Now the Russian government is harassing her.

It was easy to get in. She just went there, jumped over the fence and got right into the heart of the complex through a series of tunnels and pipes, which was very surprising. After all, this is an active industrial installation that belongs to one of the top manufacturers of liquid-fuel rockets in the world. Their engines power the modern Soyuz, the Zenit 3SL, and the Angara and Baikal launch vehicles. Heck, their RD-180 engine powers the first stage of the Atlas V, an American rocket. More importantly, they have specially strong ties to the Russian military.

And yet, she found nobody. No guards, no security. Nothing. Just a few CCTV cameras here and there in rooms packed with huge machinery."

From Gizmodo

Thanks to Derek for finding this one!

Thursday, January 5, 2012

North American Aviation XB-70 Valkyrie engines

This image from Up-Ship.com

The Valkyrie is one of the most insane jets ever made, in some ways more extreme than the SR-71. It was expensive, huge, dangerous to fly, and ultimately not particularly useful as a weapon because of ICBMs. But those are just minor reasons in the face of this:

Stats:

* Length: 189 ft 0 in (57.6 m)
* Wingspan: 105 ft 0 in (32 m)
* Height: 30 ft 0 in (9.1 m)
* Wing area: 6,297 ft² (585 m²)
* Empty weight: 128,000 lb (58,100 kg)
* Loaded weight: 534,700 lb (242,500 kg)
* Max takeoff weight: 550,000 lb (250,000 kg)
* Powerplant: 6 × General Electric YJ93-GE-3 afterburning turbojet
* Dry thrust: 19,900 lbf (84 kN) each
* Thrust with afterburner: 28,800 lbf (128 kN) each
* Internal fuel capacity: 300,000 lb (136,100 kg) or 46,745 US gallons (177,000 L)

Performance

* Maximum speed: Mach 3.1 (2,056 mph, 3,309 km/h)
* Cruise speed: Mach 3.0 (2,000 mph, 3,200 km/h)
* Range: 3,725 nmi (4,288 mi, 6,900 km) on combat mission
* Service ceiling: 77,350 ft (23,600 m)

More XB-70 images:




Wednesday, January 4, 2012

Silver Spur 3

I think there was a post about this rocket including the video below, but I can't find it right now. What is new to this blog are some of the images from before the flight. The Silver Spur 3 flight employed some interesting construction techniques, particularly the use of ablative leading edge material on the fins. This may be considered excessive, or nearly so at "just" mach 3.3, but that is around the threshold where severe composite delamination has been occurring. As always, I push for aluminum fins in these circumstances, but there are good reasons to test out the composite fins. It is taking on extra risk for the benefit of the community. It remains to be seen how far high temperature epoxy can go (that means above the 500 degree epoxy used to date) but I have reason to expect that really smart application of high temperature epoxy should be good for sustained flight over mach 3, and even short periods above mach 4 below 50,000 feet. Beyond this, ablatives or metal parts are required. I frequently wonder about either a metal leading edge, or even a thin sheet of titanium or aluminium attached with some high temp. epoxy. But at no time can the metal be below a composite layer because, obviously, that layer would fail anyway. The huge slug of titanium on the nosecone is certainly excessive, but very cool.

"Launch of USCRPL's Silver Spur 3 at Balls 19 in the Black Rock desert, Nevada. It features an all carbon fiber motor case, ablative fin leading edges, and a titanium nose cone tip. Flying on an O5000, it flew to about 50000 ft and reached a maximum speed of about Mach 3.3."






Images at Picasa

Tuesday, January 3, 2012

The cosmic energy inventory

Zeiss 200mm giant binoculars






These were probably made by Zeiss during WWII, so that means they were made on behalf of the Nazis. It falls among a plethora of other giant things like guns, probably made with slave labor.

Ebay is actually working!



Selling a minor item, mostly to get more rocketry money, and the results are a bit shocking... By the end of the listing I expect about 80 watchers and 250 views, hopefully they bid the item up to $200. I had soured on ebay recently because of items that did not sell well, and the fact that most rocketry items are overpriced, but perhaps there is reason for hope.

Monday, January 2, 2012

AVIATR




AVIATR

Post rate may be slower for a while

Because the following items are arriving soon:

Antec Sonata III
Antec Earthwatts 500W Power Supply
MSI P67A-G43 (B3) LGA 1155 Intel P67 SATA 6Gb/s
GIGABYTE GV-R667D3-1GI Radeon HD 6670 1GB 128-bit DDR3
OCZ Agility 3 AGT3-25SAT3-90G 2.5" 90GB SATA III MLC
CORSAIR Vengeance 8GB (2 x 4GB) DDR3 1600 (PC3 12800) Low Profile
Western Digital Caviar Green WD20EARX 2TB SATA 6.0Gb/s
LITE-ON DVD Burner - Bulk Black SATA Model
DYMO LabelWriter 450 Turbo High-Speed Postage and Label Printer
Microsoft Windows 7 Home Premium SP1 64-bit - OEM
TRENDnet TW100-S4W1CA 10/100Mbps DSL/Cable Broadband Router
Intel Core i3-2130 Sandy Bridge 3.4GHz LGA 1155 65W