In many cases they're looking for afterglow or secondary effects. When a gamma ray burst is observed, it's common to request optical telescopes to point in the direction of the burst in the hopes they'll see what caused it.
You guys are going about this all wrong. Combine a targeting system with a decent laser and you can blind the camera and kill the drone at the same time. No need for dueling drones.
Just make sure your system can tell the difference in a passenger aircraft or helicopter and a drone... It could go badly if you manage to punch holes in a police helicopter.
Radio Shack already extended it's credit facilities well beyond what is normal. In addition, one of the major creditors has claimed Radio Shack management violated the terms of their contract. They operated at a severe loss during the Christmas season, which is usually their "good" time of year. There's no way anyone is going to extend Radio Shack more credit. Get ready for the fire sale, with all the creditors lining up to get back whatever they can to minimize the loss from their investment.
AMD had fabs. They had several. The cost of operating them was a heavy burden on their bottom line; so, they spun them off in 2009 (that would be Global Foundries) and decided to go fabless. Now, they're experiencing the consequence of being dependent on 3rd parties to do their manufacturing for them. TSMC is building more fab capacity -- they just can't get it online fast enough (it takes several years to build and qualify one of these fabs)
It's not going to stop spinning. What will happen, though, is the Earth will eventually become tidally locked with the Moon. The pair will continue to rotate around the barycenter. Unfortunately, the Earth and Moon may be engulfed by the expanding Sun before this happens.
Because that's when the problem occurs. Reasons might be as follows: First, while systems might have been exercised, nothing is fully pressurized, the engines are not running, the controls are all running through the link to ground, and everything is running on shore power. During the final moments, (not necessarily occurring in this order) they switch to internal batteries and disconnect from shore power, spin up the on-board computers with the launch parameters and hand control over to them, switch from ground (hardwire) linkage to radio communications linkage, engage range safety systems and get acknowledgement they're online, top off the fuel tanks, shut the fuelling valves, pressurize the tanks and pneumatics, spin up the hydraulic pumps, confirm the nozzle gimbals function correctly and finally start the engines. During any one of these steps (and I'm certain I've missed a couple) something can (and occasionally does) go wrong.
The vehicle is designed with engine out capability; so, if they lose one engine, it's not the end of the world. They put shields and baffles with Kevlar blankets between the engines so it's unlikely (but not entirely impossible) a catastrophic failure will harm an adjacent engine.
This is understated and under-represented in the discussion. If you wait for a star to pass through the Oort cloud, before you go exploring, you're waiting too long. The star will disturb objects in the Oort cloud, some of which will begin to slowly fall inward. Probability of a new extinction level meteor impact would go up considerably. from the article:
By some estimates, Gliese 710’s passing will cause as many as 2.4 million comets to move into Earth-crossing orbits. As noted in my book “Distant Wanderers,” these comets will only gradually arrive in our vicinity over a period of some two million years.
So, not an immediate threat; but, a threat non-the-less.
I think the reason you're not hearing them talk about recovering 2nd stages is their program of incremental improvements. Once they have a system for recovering the 1st stage working, and have successfully launched a couple of F9Heavy boosters, I think you'll see the 2nd stage recovery talks come back.
NASA didn't trust the "re-usability" of the Dragon enough to allow this (at the time) untested vehicle to be re-attached to the ISS. Assuming they get the contract for crew launch, that might change.
Because the booster might cost something like $20 million and the fuel cost is like $200,000 per launch. The fuel cost is 1% of the cost. If you can recover the booster and re-use it 10 times or more (without all the refurbishment required for each turn of the Space Shuttle), you've reduced launch cost considerably. If you can do this, it might make sense to just build a bigger re-usable booster, if you need to launch more mass.
SpaceX is doing this the right way: They want to test re-use; so, they increased the fuel capacity and upgraded the engines. There was no lose of up-mass, in fact it increased. Having done this, they still have the margin to bring the booster back. NASA never tried this for three reasons: (1) Every launch is basically a one-off, unique mission. Standardization was driven by Air Force and commercial interests. (2) Their budget is so tight that, if they could save a couple million on a given mission by using a throw away booster, they would. They put onerous flight rules in place, which guaranteed the cost of recertification of the vehicle for re-use made it uneconomical. (SpaceX is contractually obligated to use a new booster and new cargo/crew module for each ISS mission, even though they are theoretically re-usable -- they plan to re-use some of the components for commercial flights) (3)They convinced themselves it couldn't be done. They assumed the booster couldn't be controlled on re-entry -- it would tumble. They convinced themselves that firing an engine into a supersonic flow (engine pointed in the direction of travel, to slow the vehicle) would not be stable and would not allow for precision control of the vehicle.
you're absolutely right. Musk, et. al. have repeatedly said re-use is a necessary component for reaching the price point they're targeting. The big rockets they're planning for later (Mars Colony Transporter (MCT) aka Big Falcon Rocket (BFR)) would be untenable as a throw away. Imagine a rocket big enough to lift the entire ISS to orbit in 3-4 launches. Now, imagine doing that for fuel cost alone. That's where SpaceX is headed.
parent is missing the point + what follows is a bit of a circular argument. Asteroid mining isn't going to do anything, directly, for people on Earth. If, however, you're going to build infrastructure to support space exploration and colonization, in the long run you need to learn to use "local" resources. You're not going to do it successfully entirely using resources lifted from the surface of the Earth.
Musk has been clearly stating that one of his long term goals is exploration and colonization of Mars. As an example: Elon Musk: The Case for Mars. That mission statement is written right into SpaceX documentation: About SpaceX
There's no need to do that much maneuvering. I'm not talking about wholesale landing on the X (marks the spot). You only have to do minor course corrections to be sure you land in roughly the right region on the surface. Mars missions will need some kind of transportation (or what's the point). You only need to put the drop within a day or two transport distance.
U2 aircraft are responsible for some. F-117 stealth fighters were responsible for quite a few too -- they were operational for over a decade before it was publically acknowledged they existed.
This has been standard NASA thinking for decades, that it was too hard to start an engine in the supersonic regime, hard to control flight, and therefor too risky to incorporate into any mission. However, SpaceX has shown that you can relight an engine pointed into a supersonic flow, and maintain control of the vehicle with the engine pointed into the supersonic flow. It's not without flaws, but it works. There are groups inside NASA that are beginning to rethink the old arguments and investigate this for use in future applications.
If the plane makes it to mass production and get widely implemented, which it seems destined to do thanks to inertia and politics... I predict the F-35 will be awesome... in about 15 or 20 years, once they've worked all the bugs out and upgraded the systems.
Neat. But way to slow for an industrial sorting process. Use a fast PLC with a vision system. Use bursts of high pressure air to blow the M&M into the appropriate chute as it goes by on a high speed conveyor. blah, blah, blah. Actually, isn't it faster just to buy the M&M's in bulk, pre-sorted, directly from M&M Mars ?
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In many cases they're looking for afterglow or secondary effects. When a gamma ray burst is observed, it's common to request optical telescopes to point in the direction of the burst in the hopes they'll see what caused it.
You guys are going about this all wrong. Combine a targeting system with a decent laser and you can blind the camera and kill the drone at the same time. No need for dueling drones. Just make sure your system can tell the difference in a passenger aircraft or helicopter and a drone... It could go badly if you manage to punch holes in a police helicopter.
piezo electric's are already being used in fuel injectors
Would you like fries with that?
Would you like butter on your popcorn?
I bet they'll get a charge out of that.
In Soviet Russia graphene makes pom-poms of you
So many options... so little time... I have to go to work now.
Ebay.
Radio Shack already extended it's credit facilities well beyond what is normal. In addition, one of the major creditors has claimed Radio Shack management violated the terms of their contract. They operated at a severe loss during the Christmas season, which is usually their "good" time of year. There's no way anyone is going to extend Radio Shack more credit. Get ready for the fire sale, with all the creditors lining up to get back whatever they can to minimize the loss from their investment.
AMD had fabs. They had several. The cost of operating them was a heavy burden on their bottom line; so, they spun them off in 2009 (that would be Global Foundries) and decided to go fabless. Now, they're experiencing the consequence of being dependent on 3rd parties to do their manufacturing for them. TSMC is building more fab capacity -- they just can't get it online fast enough (it takes several years to build and qualify one of these fabs)
It's not going to stop spinning. What will happen, though, is the Earth will eventually become tidally locked with the Moon. The pair will continue to rotate around the barycenter. Unfortunately, the Earth and Moon may be engulfed by the expanding Sun before this happens.
Because that's when the problem occurs. Reasons might be as follows: First, while systems might have been exercised, nothing is fully pressurized, the engines are not running, the controls are all running through the link to ground, and everything is running on shore power. During the final moments, (not necessarily occurring in this order) they switch to internal batteries and disconnect from shore power, spin up the on-board computers with the launch parameters and hand control over to them, switch from ground (hardwire) linkage to radio communications linkage, engage range safety systems and get acknowledgement they're online, top off the fuel tanks, shut the fuelling valves, pressurize the tanks and pneumatics, spin up the hydraulic pumps, confirm the nozzle gimbals function correctly and finally start the engines. During any one of these steps (and I'm certain I've missed a couple) something can (and occasionally does) go wrong.
The vehicle is designed with engine out capability; so, if they lose one engine, it's not the end of the world. They put shields and baffles with Kevlar blankets between the engines so it's unlikely (but not entirely impossible) a catastrophic failure will harm an adjacent engine.
By some estimates, Gliese 710’s passing will cause as many as 2.4 million comets to move into Earth-crossing orbits. As noted in my book “Distant Wanderers,” these comets will only gradually arrive in our vicinity over a period of some two million years.
So, not an immediate threat; but, a threat non-the-less.
Generally I'm agreeing with you.
I think the reason you're not hearing them talk about recovering 2nd stages is their program of incremental improvements. Once they have a system for recovering the 1st stage working, and have successfully launched a couple of F9Heavy boosters, I think you'll see the 2nd stage recovery talks come back.
NASA didn't trust the "re-usability" of the Dragon enough to allow this (at the time) untested vehicle to be re-attached to the ISS. Assuming they get the contract for crew launch, that might change.
Because the booster might cost something like $20 million and the fuel cost is like $200,000 per launch. The fuel cost is 1% of the cost. If you can recover the booster and re-use it 10 times or more (without all the refurbishment required for each turn of the Space Shuttle), you've reduced launch cost considerably. If you can do this, it might make sense to just build a bigger re-usable booster, if you need to launch more mass.
SpaceX is doing this the right way: They want to test re-use; so, they increased the fuel capacity and upgraded the engines. There was no lose of up-mass, in fact it increased. Having done this, they still have the margin to bring the booster back. NASA never tried this for three reasons: (1) Every launch is basically a one-off, unique mission. Standardization was driven by Air Force and commercial interests. (2) Their budget is so tight that, if they could save a couple million on a given mission by using a throw away booster, they would. They put onerous flight rules in place, which guaranteed the cost of recertification of the vehicle for re-use made it uneconomical. (SpaceX is contractually obligated to use a new booster and new cargo/crew module for each ISS mission, even though they are theoretically re-usable -- they plan to re-use some of the components for commercial flights) (3)They convinced themselves it couldn't be done. They assumed the booster couldn't be controlled on re-entry -- it would tumble. They convinced themselves that firing an engine into a supersonic flow (engine pointed in the direction of travel, to slow the vehicle) would not be stable and would not allow for precision control of the vehicle.
you're absolutely right. Musk, et. al. have repeatedly said re-use is a necessary component for reaching the price point they're targeting. The big rockets they're planning for later (Mars Colony Transporter (MCT) aka Big Falcon Rocket (BFR)) would be untenable as a throw away. Imagine a rocket big enough to lift the entire ISS to orbit in 3-4 launches. Now, imagine doing that for fuel cost alone. That's where SpaceX is headed.
parent is missing the point + what follows is a bit of a circular argument. Asteroid mining isn't going to do anything, directly, for people on Earth. If, however, you're going to build infrastructure to support space exploration and colonization, in the long run you need to learn to use "local" resources. You're not going to do it successfully entirely using resources lifted from the surface of the Earth.
Musk has been clearly stating that one of his long term goals is exploration and colonization of Mars. As an example: Elon Musk: The Case for Mars. That mission statement is written right into SpaceX documentation: About SpaceX
There's no need to do that much maneuvering. I'm not talking about wholesale landing on the X (marks the spot). You only have to do minor course corrections to be sure you land in roughly the right region on the surface. Mars missions will need some kind of transportation (or what's the point). You only need to put the drop within a day or two transport distance.
You realize you could control flight leading up to re-entry and upon re-entry, right?
The left hand knows not what the right hand is doing.
It's the only way to be sure.
U2 aircraft are responsible for some. F-117 stealth fighters were responsible for quite a few too -- they were operational for over a decade before it was publically acknowledged they existed.
Send the supplies ahead the slow way, just like cargo/freight ships. Then send people the fast way, like on airliners.
This. the described method could be used to litter Mars' orbit with supplies, which would be scooped up by the planet periodically.
This has been standard NASA thinking for decades, that it was too hard to start an engine in the supersonic regime, hard to control flight, and therefor too risky to incorporate into any mission. However, SpaceX has shown that you can relight an engine pointed into a supersonic flow, and maintain control of the vehicle with the engine pointed into the supersonic flow. It's not without flaws, but it works. There are groups inside NASA that are beginning to rethink the old arguments and investigate this for use in future applications.
If the plane makes it to mass production and get widely implemented, which it seems destined to do thanks to inertia and politics... I predict the F-35 will be awesome... in about 15 or 20 years, once they've worked all the bugs out and upgraded the systems.
Neat. But way to slow for an industrial sorting process. Use a fast PLC with a vision system. Use bursts of high pressure air to blow the M&M into the appropriate chute as it goes by on a high speed conveyor. blah, blah, blah. Actually, isn't it faster just to buy the M&M's in bulk, pre-sorted, directly from M&M Mars ?