Comment by stickfigure
4 years ago
> despite these being a fairly-obvious "dominant strategy" for warfare
I don't think these are quite as viable as you think. ICBMs are expensive. Probably tens of millions of dollars each, for a single-use item. Cruise missiles cost $1-$2 million to deliver the same payload and have a better chance of surprising the enemy.
ICBMs have longer range, but how often do you need to strike targets more than 1000km past the front line? They're inherently strategic weapons.
Even cruise missiles are horribly expensive for conventional munitions payloads. Cruise missiles were developed to deliver nukes.
An unguided 1000kg "dumb" bomb costs $2,000. A "smart bomb" costs $20,000 to $100,000. A cruise missile costs $1mil to $2mil.
In the scope of any protracted real war, sending out lots of cruise missiles is horribly inefficient. Much much cheaper to send out a few planes to drop 100's of tons of dumb or smart bombs. IOW, you can deliver 10x to 100x more boom if you just use planes and bombs. 1000x more if you use long range artillery. But then, the pilots or soldiers are at risk-- and that is a political calculation.
about cruise missiles, wasn't there one of those DARPA contests to see if a guy in the garage could produce a cruise missile? IIRC it got quite scary and was cancelled or something. Being in the drone and high power rocketry hobby i have absolutely no doubt there's enough knowledge and electronics availability for a guy in their garage to come up with something that delivers 50lbs to a precise gps coordinate a few hundred miles away for less than $10k. Once you do that, it's easy to scale up to 500lbs
I'm skeptical you could hit that sort of range for anywhere near $10K. Forget the electronics, you need an engine powerful enough to lift a few hundred pounds for that distance. Unless you want it detected immediately by early warning radar you need it to fly at a low altitude, like a hundred feet or less. Unless you want it to take forever and be susceptible to infantry with small arms it needs to be traveling fast, in the hundreds of miles an hour. That's simply not possible with an electric system with today's technology, and a rocket engine won't provide the endurance or efficiency you need. That leaves a jet engine or pistol engine. Plus, flying at that speed and altitude means you need an effective autopilot system that uses terrain-following radar. You'll also need some nice guidance packages that allow the shooter to set multiple waypoints, so the missile doesn't have to just fly a direct course. And a 50 lb payload of high explosive just isn't that helpful. There aren't a ton of targets where you only need 50lb of explosives to defeat them, that are also going to stay in the same exact GPS position long enough for your missile to travel a few hundred miles. So you'll want a different terminal guidance method, either some sort of radar sensor or infrared.
I don't think you could get an engine capable of getting you hundreds of miles at that speed and altitude, much less the sensors and guidance system.
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There was a man in New Zealand trying to make a very low-cost DIY cruise missile as a hobby project [0]. iirc, he was using a pulsejet engine, but ended up getting shut down by some visits from stern-looking government agents.
0: https://www.theguardian.com/world/2003/jun/04/terrorism.davi...
> wasn't there one of those DARPA contests to see if a guy in the garage could produce a cruise missile? IIRC it got quite scary and was cancelled or something.
This sounds similar to the Nth Country Experiment, conducted by the US in the 1960s. The idea was to see if three freshly minted physics PhDs could design a working nuclear weapon using only publicly available information. In less than 3 years, the three succeeded in creating a credible design for an implosion-style bomb.
https://en.wikipedia.org/wiki/Nth_Country_Experiment
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> ICBMs are expensive. Probably tens of millions of dollars each
For sub-launched ICBMs (like the UK's nuclear deterrent) you also need to factor in the through-life costs of the launcher platform, and the fact that once it starts launching, it has given itself away. We only have four subs, not all of which are on patrol, so it would be barking to compromise these to deliver a conventional payload.
Submarine launched ICBMs probably wouldn't be valuable without nuclear weapons though: they're valuable because they're a guaranteed second-strike capability to a nuclear first strike - you might plausibly get the land and air launchers, but there's no way to be sure you got all the subs and you only have to miss 1 (i.e. no country would survive losing 28 major cities).
Without nuclear weapons, they're kind of pointless - you don't inflict enough damage to warrant the expense. But the first strike is also so much more survivable.
Which country is "we"? The US has 14 Ohio class SSBNs in service until at least 2029
Probably the UK.
https://www.royalnavy.mod.uk/news-and-latest-activity/operat...
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> ICBMs have longer range, but how often do you need to strike targets more than 1000km past the front line?
Don't you need to also consider the vast expense countries (okay, mostly just the United States) spend to essentially extend their "front line" well beyond their own borders?
Well the first year of the Iraq War cost the US $54 billion, according to congress's budget[0]. This doesn't include the total cost of the supporting infrastructure need to be able to deploy troops in Iraq quickly, but we can estimate that using the increase in defence budget from 2002-3, or $94 billion ($132B in 2020)[1].
According to Wikipedia, Minuteman III ICBMs have a 2020 unit cost of $20 million[2], so for the cost of an Iraq invasion, the US could have fired about 6600 missiles. Considering the invasion toppled the Iraqi government, it's pretty unlikely that firing 6600 missiles with conventional payloads would have been anywhere near as effective.
[0]: https://en.wikipedia.org/wiki/Financial_cost_of_the_Iraq_War...
[1]: https://en.wikipedia.org/wiki/Military_budget_of_the_United_...
[2]: https://en.wikipedia.org/wiki/LGM-30_Minuteman#Counterforce
The comparison we're making is whether precision attacks, presumably on roughly building-sized targets, would be cheaper to do from long range via ICBMs (with conventional warheads), or via much cheaper but shorter-range missiles. My guess is that neither ICBMs nor shorter-range missiles could have accomplished what the U.S. military accomplished in Iraq. Presumably missiles alone were responsible for a small portion of that $54 billion.
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In a world without nukes, we would've been all about precision targeted ICBM munitions. In a war they would've been used to hit government centers, military bases, staging and supply areas, oil refineries and wells etc.
It's an infinite range weapon which arrives in 20 minutes to kill a target your spy satellites see. They would be used all the time.