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Mythbusters 11/3: "Arrow Machine Gun"

Christopher

Writer
Admiral
Arrow Machine Gun: An interesting build, to be sure, but the coverage of the design process was too cursory. Did they research the available designs, construction techniques, and technologies from the era? How much of the build was historically plausible and how much was just Adam & Jamie? I wish they'd talked about that. The design and the historical and scientific rationales behind it are the most interesting part of a myth like this, certainly more so than "Oh, what's broken this time?"

Still, it was interesting to watch them refining and debugging the weapon as they went. I was ready to conclude that the thing was just too complicated to be practical, but at the end there, they seemed to figure it out. And that was in just a few days. So I guess "plausible" it is.

Driving while sleepy: Pretty straightforward, and the results were unsurprising. This isn't an urban legend, it's something the experts have warned about for years -- that driving while sleep-deprived is a proven danger. So this was really more a public service demonstration than a myth test.

I think the monotonous-driving test would've worked better if they'd actually had a long straightaway instead of that track with all the turns in it. They should've done it at the Alameda Naval Base. Come to think of it, they don't seem to go there much anymore.

Anyway, given that Kari is a new mother, did they really have to go to special lengths to induce a sleepless night?
 
I've seen the "machine gun crossbow" thing before, interesting what Jamie and Adam did here as the one's I've seen before were less "machine gun" and more "semi-automatic."

Fun myth for them to do.

The results of the Tipsy vs. Tired thing wasn't too surprising. Anyone who's driven knows they're not a good driver while tired. Still another fun, solid, myth for the Junior Mythbsuters to take on. And, man, I think I fall more in love with Kari with each episode.

These last couple episodes have been much better and on par with what I'd expect from this show. The first two episodes must've been a statistical dip.
 
Anyway, given that Kari is a new mother, did they really have to go to special lengths to induce a sleepless night?

:lol: My wife said exactly the same thing.

Didn't Kari look adorable when she was snoozing in the car after the test?
 
Watched this episode tonight with a buddy and some more thoughts came to mind.

Jamie and Adam's "machine gun crossbow" was just wickedly cool. Probably one of the coolest things the two of them have built, up there with the tree canon and the chicken-launching air gun. Hell even beyond that. The complexity of the thing, how they got it to work, dialed in the kinks and everything was just marvelous. Plausible seemed like a good final call, I think it's fairly impractical for an ancient army to make something like this considering how much work it took two smart men with 21st century knowledge of mechanics and physics to do it. Not to mention they had ready-made parts (like the cogs and chains) that an ancient army would've had to hand-craft, the MB's "gun" had the plastic track for the action (an ancient army would've had to use oil or leather or both for this) and well it took them a lot of trial and error to get the thing to work right. Still a very impressive build.

One quibble I had about the Tipsy vs. Tired driving thing.

There was no control!

Kari and Tori say Grant will be the control but not only do I not recall him doing it, or us being shown it, his control is useless when comparing it to Tori and Kari! When Kari was Tipsy she weaved out of the lanes and knocked over cones when parallel parking. Now, either this happened because she was "tipsy" or because, well, she just sucks at driving. We don't know.

It also makes a bit of sense that being dead-tired from being up for a day-straight would make someone a poor driver. I'm not sure that quite compares to someone being "tipsy" (i.e. within the legal driving limit.) I mean, by law, they can drive. So obviously they should be able to do it, right? I wonder if there's not any way they can get the ability or permission to drive drunk in a controlled setting or use one of those "test cars" that supposedly react to a sober person's driving in a manner as-if they were drunk.

But I don't think being a bit tipsy and giddy equates to being dead tired. And, as I said, there was no control to know what their base-line driving ability was in this test.
 
complexity of the thing, how they got it to work, dialed in the kinks and everything was just marvelous. Plausible seemed like a good final call, I think it's fairly impractical for an ancient army to make something like this considering how much work it took two smart men with 21st century knowledge of mechanics and physics to do it.

Don't underestimate the knowledge of the ancients. They had more than enough knowhow to build a device like this. Heck, it was only 250 years later that the Antikythera mechanism, a sophisticated mechanical computer, was built.

And it's not like the army invented it on the fly or something. They had engineers back then -- specifically, the engineers assembled by Dionysius the Elder, ruler of Syracuse, to develop new weapons for an impending war with Carthage. And the project began in 399 BCE, meaning that those engineers would've had two years to develop the weapons before the war actually started in 397. Adam and Jamie just had a few days or weeks to figure it out.



One quibble I had about the Tipsy vs. Tired driving thing.

There was no control!

That's a common complaint about the Kari/Tory/Grant myths this season. It's possible that they do run control tests but they just get edited out for time.
 
Also, the ancients had more time to build these devices and perfect them, and work out the kinks. One thing about this show, they have a few days to build the devices, at most a week, but in reality ancient civilizations might have taken years to perfect such devices. So, if they ever debunk a claim on an ancient weapon in only having had 3 days to build it, I would pass it off, cause in reality it might have taken years to get it work just right, trial and error.
 
One quibble I had about the Tipsy vs. Tired driving thing.

There was no control!

Kari and Tori say Grant will be the control but not only do I not recall him doing it, or us being shown it, his control is useless when comparing it to Tori and Kari! When Kari was Tipsy she weaved out of the lanes and knocked over cones when parallel parking. Now, either this happened because she was "tipsy" or because, well, she just sucks at driving. We don't know.

Totally agree on that one, I noticed it as well.
 
Have they done a myth yet about women being worse drivers than men? If not, they should, heh

Would have to get a large sample group obviously
 
I don't want to start a new thread for the 11/10 "Mini-Myths" episode, both because there's not too much to discuss and because apparently the mods want us to consolidate threads by series (at least in SF&F, I don't know if that applies here). So I'll just add it here.

I think the premise was a bit bogus. I don't believe for a second that they chose these myths at random, since a lot of myths aren't practically testable. So they shouldn't have presented it with that pretense.


Scuba tuxedo: Which Bond movie was this from? I think Goldfinger, but I could be wrong. Anyway, I'm surprised it worked. I can believe the scuba suit would keep one's clothes dry underneath, since watertightness is kind of the whole point, but I'm surprised that the tux didn't get more crumpled and sweaty.

What would've been a better test would be if the judge hadn't known which Mythbuster had been in the scuba suit and had to try to guess from the relative state of their tuxedos.


Tire pressure/mileage: Pretty simple and straightforward. Not much to say. I already knew that low tire pressure was bad for mileage, and I'm still mad at myself for not discovering how low my left rear tire pressure was until I was 2/3 of the way home from Manhattan last month. That reduced my fuel efficiency by several percent at least. Next time I go on an interstate trip, I should check my tires before I set out.


Sneeze blocking: I didn't pay much attention to this one, but the results, again, weren't too surprising.


Bulletproof objects: So a laptop battery is bulletproof (or shot-proof), the rest of a laptop isn't, a hair weave isn't, and a fridge door isn't. I didn't really get at first what a "hair weave" was; I thought it meant that somebody's really heavily interwoven hairdo was alleged to be bulletproof (the Janice Rand defense?). I guess the term refers to a form of hair extension or partial wig. I guess even my idea wouldn't have worked to stop a bullet; it's just hair, after all.


Instant-freezing beer: I'm rather surprised this worked. An interesting demonstration of supercooling. I have two questions they failed to address, though. One: why does the beer get supercooled instead of freezing? I'd assume it's due to a lack of nucleation sites, but why is that? Two: why doesn't it expand and break the bottle when it freezes?


Taking candy from a baby: Okay, now they've crossed into evil science. Actually calculating how hard it is to take candy from a baby! Well, I blame the fan who sent in the question.

Anyway, it was kind of bogus to measure the difficulty based solely on grip strength. I mean, even if it's 25 times harder to pull the candy from a baby's hand than just to pick it up, it's still a lot easier than, say, moving furniture or changing a car tire. I think the most informative result here was how good babies are at evasion. That's the thing that makes it hard to take candy from a baby. Also the crying; even if you are a genuinely evil scientist, or are otherwise hard-hearted enough not to care about the crying, it would still serve to attract the attention of others in the vicinity who might prevent you from succeeding in your archetypally nefarious act.

So it isn't actually easy to take candy from a baby, but not for the reasons they cited.

What I found most interesting here was how strong the youngest baby's grip strength was compared to the older ones. Not really surprising, but interesting.
 
The baby myth was odd. I've never heard "taking candy from a baby" to imply anything about the ease of just picking it up on its own.
 
I don't want to start a new thread for the 11/10 "Mini-Myths" episode, both because there's not too much to discuss and because apparently the mods want us to consolidate threads by series (at least in SF&F, I don't know if that applies here). So I'll just add it here.

As far as I know having separate episodic threads is okay.

I think the premise was a bit bogus. I don't believe for a second that they chose these myths at random, since a lot of myths aren't practically testable. So they shouldn't have presented it with that pretense.

Eh, that's all it was was pretense. Just a "serving platter" for the basis of the episode. I doubt the gang was sitting around watching movies when they came up with that episode idea either.

Scuba tuxedo: Which Bond movie was this from? I think Goldfinger, but I could be wrong. Anyway, I'm surprised it worked. I can believe the scuba suit would keep one's clothes dry underneath, since watertightness is kind of the whole point, but I'm surprised that the tux didn't get more crumpled and sweaty.

If the SCUBA suit was a "dry suit" it makes sense the person inside would stay, well, dry. But, yeah, barring it being a wrinkle-free suit it surprised me too that Jamie was able to stay top form.

What would've been a better test would be if the judge hadn't known which Mythbuster had been in the scuba suit and had to try to guess from the relative state of their tuxedos.

I thought he HAD not know. If he did that's a bit of a flaw in the "method" here. The "Tuxedo Expert" was also a bit of a lint-picking snob for my tastes.


Tire pressure/mileage: Pretty simple and straightforward. Not much to say. I already knew that low tire pressure was bad for mileage, and I'm still mad at myself for not discovering how low my left rear tire pressure was until I was 2/3 of the way home from Manhattan last month. That reduced my fuel efficiency by several percent at least. Next time I go on an interstate trip, I should check my tires before I set out.

Yeah, this tire thing I've heard for years. And as they pointed out over-inflating your tires will roughen the ride of the car and can be dangerous. (Makes the tires more likely to have a blowout if they strike an object.)

Sneeze blocking: I didn't pay much attention to this one, but the results, again, weren't too surprising.

Quick and dirty: The "standard" covering your mouth offered little more protection than out-right doing it. As the sneeze-material just gets jetted out the top of your cupped hand, not to mention now contaminating your hand.

Using your elbow offered complete protection with the benefit of not contaminating your hand.

Using a hankie offered better protection (though the high-speed show about the same, but less sever, expulsion as a cupped hand) than a hand but has the drawback of contaminating your hand and the potential for recontamination when you handle the hankie and, well, carrying a rag full of germs in your pocket.

No surprising results here, I've been using my shoulder for these very reasons for years.


Bulletproof objects: So a laptop battery is bulletproof (or shot-proof), the rest of a laptop isn't, a hair weave isn't, and a fridge door isn't. I didn't really get at first what a "hair weave" was; I thought it meant that somebody's really heavily interwoven hairdo was alleged to be bulletproof (the Janice Rand defense?). I guess the term refers to a form of hair extension or partial wig. I guess even my idea wouldn't have worked to stop a bullet; it's just hair, after all.

When I saw them pull-out the old school fridge I quickly thought of Indiana Jones. Nothing surprised me here, most of all the hair weave. Which sometimes are styled but even then it's just freaking hair. Kari's idea that the ricochet got caught in there makes the most sense. I knew the birdshot would be easily stopped, stopping a 40 seemed to me to far less likely. Would've been nice if they showed "how" the article could've happened. (Like they did with the laptop.)


Instant-freezing beer: I'm rather surprised this worked. An interesting demonstration of supercooling. I have two questions they failed to address, though. One: why does the beer get supercooled instead of freezing? I'd assume it's due to a lack of nucleation sites, but why is that? Two: why doesn't it expand and break the bottle when it freezes?

That was neat and I'm going to need to try it. Their supercooling idea is what I was thinking as it's very similar to how freezing rain works. It super-cooled water that has too much energy falling from the sky to freeze. When it impacts a surface it loses that energy and instantly freezes. I suspect something similar here but with the nucleation sigtes. On why it doesn't break the bottle as it expands? Maybe, like water, it doesn't expand when it freezes but remains the same size or shrinks and there's no gas or other materials to displace in the bottle as it "expands" to break the bottle open.

Taking candy from a baby: Okay, now they've crossed into evil science. Actually calculating how hard it is to take candy from a baby! Well, I blame the fan who sent in the question.

This one was just fun. It was neat to see how easily the babies used diversionary tactics to avoid the candy being taken away, but I've never taken the idiom to mean that you could do it quickly, easily, and not have anyone alerted without any work in it. If Jamie and Adam weren't so easily enamored with the baby and cared when it cried they'd just snatch the candy away and run off. That's what "taking candy from a baby" means. Babies offer very little if any resistance. Sure they're going to offer some in the form of gripping it or avoidance but if Jamie and Adam wanted it, they'd get it. The baby crying afterwards is moot. The idiom, as I understand it, doesn't imply that the "baby" wouldn't alert anyone to what you did. Unless the baby is Maggie Simpson.
 
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