Supercapacitor, about 100KJ/kg.
A silk bag full of gunpowder, like a big gun uses, typically weighs
110 lbs, 50 kg. A pretty big shell might use two, 300 MJ. If they blow up in, guess, 10 msec, that's about 30 gigawatts.-- John Larkin Highland Technology, Inc picosecond timing precision measurement jlarkin att highlandtechnology dott com http://www.highlandtechnology.com
John Larkin wrote in news: snipped-for-privacy@4ax.com:
They fire at targets 100km away, and are aimed far more accurately than any powder actuated projectile we or any other human ever made.
John Larkin wrote in news: snipped-for-privacy@4ax.com:
"controls"?
What? The helm?
Don't ships have dual GPS/IRU packages at each end of the ship?
Antiship missiles tend to be supersonic, or hypersonic, come in horizontally at wave-skimming height, have terminal guidance, and have ranges of hundreds of km.
The days of big ships shooting guns at one another ended in WWII.
The days of big ships themselves are probably numbered. They are huge, expensive targets for cheap smart weapons. An aircraft carrier hardly needs a runway any more. Maybe not a crew.
-- John Larkin Highland Technology, Inc picosecond timing precision measurement jlarkin att highlandtechnology dott com http://www.highlandtechnology.com
But so far are just demonstrations. No ballistic projectile can hit anything 100 km away.
-- John Larkin Highland Technology, Inc picosecond timing precision measurement jlarkin att highlandtechnology dott com http://www.highlandtechnology.com
Throttle and engine controls mostly. Boiler controls on the big steamships.
Not back then. A gyrocompass and Loran was what they used. And sextants.
-- John Larkin Highland Technology, Inc picosecond timing precision measurement jlarkin att highlandtechnology dott com http://www.highlandtechnology.com
John Larkin wrote in news: snipped-for-privacy@4ax.com:
And cost millions of dollars each 'shot'.
You think a MACH 7 device has windage issues?
John Larkin wrote in news: snipped-for-privacy@4ax.com:
We had no problem hitting the moon.
ICBMs are ballistic and hit targets thousands of km away.
A device that has a muzzle velocity of MACH 7 does not exactly operate under normal "ballistic rules". It is even mentioned about how flat their path is.
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th
currently no commissioned Navy vessels with rail guns. The guns are on v arious test stations. In naval exercises in the spring of 2019 The Navy fir ed about two dozen hypervelocity projectiles (HVPs) ? special round s initially designed for electromagnetic railguns ? from the Mk 45
5-inch deck gun aboard the Arleigh Burke-class destroyer. The Mk 45 is stan dard on the Arleigh Burke class vessels.ve the Advanced Gun System (AGS), a naval artillery system developed and pr oduced by BAE Systems Armaments Systems for the Zumwalt-class destroyer, de signated the 155 mm/62 (6.1") Mark 51 Advanced Gun System (AGS).
anned.
e outfitted in San Diego after is left BIW in Maine (where it was built) fo r sea trials.
ns on the DDG1000 as an experiment however a fair amount of engineering mod ifications to the ships power system is required. Since the ship is an 'all electric' vessel, the mods are not very straight forward. Having spent so me time on the ship prior to release for sea trials, I can attest that the power gen/conversion/distribution is a very interesting design - unlike any vessel before it.
That's one of the problems with the big guns, is the huge release of energy all at once. The massive barrels wear and can warp. The 80 mile range of the AGS was based on GPS guidance of the shells. They in turn get very ex pensive and they might as well fire a missile at the target and be done wit h it.
At shorter distances like 10 miles, big guns are very effective and accurat e.
Don't try to do a missile job with a gun.
-- Rick C. +- Get 1,000 miles of free Supercharging +- Tesla referral code - https://ts.la/richard11209
Yeah, but sixteen-inch shells don't leave the target intact just because they miss by a few yards.
Historically we didn't equip the artillery with radars to refine the shell trajectories, either. One doesn't want to win the historic battles, but the future ones, and... maybe artillery IS the right tool for that.
Rick C wrote in news:997add2e-59b0- snipped-for-privacy@googlegroups.com:
Likewise don't try to do a gun job with a missile.
$25k per is a lot cheaper than hundreds of thousands or eben millions each.
It is all about the asset being considered for destruction, its size and the attacker's intent.
Might try a cheap fast round or two, and if that fails send the missile. If it doesn't fail, many $thousands are saved.
That comparison isn't fair. You'd need to also include the ~3kg of oxygen needed to burn that kg of gasoline, and the machinery to effect the conversion. Explosives have a way of releasing their energy quickly. That's useful if you want to briskly accelerate something.
Jeroen Belleman
GPS navigation is usable only against fixed targets.
With projectiles with a significant flying time, you must assume that a moving target has a fixed speed vector and aim accordingly. However, if the target accelerates in some direction during projectile flight time, you miss the target.
That would require more than 220 m height if the other end is at sea level or the distance between two 55 m high ships.
If the target is beyond the horizon, you can't use lasers or microwave guidance.
While a projectile might fly that distance when traveling most of the path high in the atmosphere, but what is the speed and hence kinetic energy at the target ? The atmospheric drag at lower layers will quite effectively kill the speed.
Remember that a quite large meteorite (with large mass/area) is required to hit the ground at a significant speed even if the meteorite initial speed was more than 11.7 km/s (escape velocity).
There might be some requirements but what are the actual values. Especially when actual performance is much lower than expected it is quite convenient to classify things :-). It is especially important to hide the bad actual performance from those financing the project.
Many large battle ship has been lost not by direct enemy fire but due to fire spreading into gunpowder and ammunition storage, causing huge explosion, actually splitting the hull at least into two parts.
The nice thing about railguns is that gunpowder is not stored on board, reducing risks for catastrophic explosions.
I participated in the design and test sets for two of the boxes that flew on the S1B first stage.
The downlink had a scanned ADC that hit each analog input about 6 times per second. A couple of sensors made short spikes that they wanted to resolve.
One box was the "pulse converter" basically a discriminator and a flipflop. The first thing I did on that one was to fix a bug in the flipflop that the company founder had designed. He was a physicist!
The other was the "time correlation unit", a discriminator that fired a linear ramp generator. An ADC sample of the ramp voltage was used to resolve the trigger time to a small fraction of the telemetry rate. It used a bootstrapped RC ramp, jfet follower, AC coupled to the load to remove fet offset, clamped to zero between ramps by a dual-emitter transistor.
Both were small, maybe 4" square, die-cast aluminum boxes with Ampenol connectors that plugged into some rack. We used all discrete transistors and home-made single-sided boards. Some big company had tried the TCU before us, and used a newfangled expensive IC opamp, but it didn't work well so NASA let us try it.
I was a college freshman, employee #5 of that company, eventually chief engineer, and we had a really grubby shop above The River Rendezvous bar a few steps from the Mississippi River levee, but NASA gave us the job to make flight hardware. I think there was a deliberate plan to spread work around to small companies. When they finally fired me, we had 200 employees.
-- John Larkin Highland Technology, Inc lunatic fringe electronics
Interesting - wrt the ff, was it a discrete implementation I assume? Home made boards - the old copper chloride solution for the etchant? ferric chloride? roll your own? (hydrogen peroxide + muratic acid, or Hydrochloric Acid) lol bar convenient after a long week! Fired? hmmm you upset a biz type?
Yes, two NPNs, resistive pullups and crossovers, and diode-RC steering for the negative pulse trigger input.
Home-made, purchased photosensitized FR4, UV lamp to expose, FeCl etch, hand drilled. For NASA!
It was complex. Involved a woman.
-- John Larkin Highland Technology, Inc lunatic fringe electronics
Wrong again, AlwaysWrong. I was in systems development ("Machine Technology", to be precise. That happens a bit before they're marketed.
snipped-for-privacy@notreal.com wrote in news: snipped-for-privacy@4ax.com:
Fine. EXCEPT that YOU SAID that you started there "at the end" of the 360 program. Sure they were supported after they were made, but they quit making them in 1978, therefore, from your own statements, you strated there just before or around then.
Otherwise your statement needs amendment. Real simple. I never said you were not there. I simply went by YOUR remarks.
Hardly Ballistic, AlwaysWrong. How many course corrections were used?
AlwaysWrong is simply always wrong. ICBMs use "terminal guidance" to hit the target. MIRVs have to.
AlwaysWrong is wrong, of course. Mach doesn't redefine G.
You really are dumb, AlwaysWrong.
Wrong again, AlwaysWrong. You're just stupid.
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