Sam the Octopus
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- a microSD card weighs somewhere around 0.4g
- the highest capacity microSD that's easily available is 256GB
- a trebuchet can throw a 90kg projectile over 300m

90kg worth of microSD cards is 225,000 of them

Therefore a trebuchet can throw 57.6PB of data over 300m

This would have the highest throughput of any telecommunications network ever created

@troubleMoney round trip time is not great though, reloading a trebuchet takes time

@codl but you just can't beat the almighty crash of your internet arriving for the day

@troubleMoney The trouble is data reliability and the absence of speedy error correction mechanisms. You'd have to admit a 57.6 PB mass of data would not arrive at its destination with every 256 GB packet intact, let alone in the proper order. (Well, it would arrive there intact and in the proper order at the instant of arrival, but the buffer it's then immediately pressed into is not exactly compatible.)

@arielmt eh, there's enough space, could put it in RAID or something :blobgrin:

@natalie @troubleMoney Whether the parity is even or odd, it definitely has a hard requirement of one stop bit.

@troubleMoney RAIT: Redundant array of independant trebuchets.

RAIP: Redundant array of independent projectiles.

Though I could see that last one .... not going over so well.


@grainloom @troubleMoney @arielmt yah, but still, the *latency* would kill most modern applications which somehow have never heard of mobile networks, or unreliable networks

anyway, i'd be very intrigued to see a robot for plugging that string in and out at a data centre.

@arielmt @troubleMoney I dunno, I think RFC2549, "IP Over Avian Carriers With QoS" would cover it, with a few tweaks.

@arielmt @troubleMoney if you packaged it right, you could solve this issue, but it would add to the weight and significant lower your data transfer speed.

if there were a trebuchet already ready on the other side, it would simple be an issue of how fast one could process the necessary data on the receiving side before transport back to the sending side begins.


weapons and stuff Show more

@troubleMoney I think your bottleneck would appear in the loading and unloading of the payload

@troubleMoney but wait.

A microSD card occupies a volume of 0.165 mL.

A 45' hi-cube intermodal container has an internal volume of 86020 L. This means that you can fit 521 million microSD cards in one such intermodal container.

This means you can fit 133.5 EB of data on the back of a large truck, substantially more than you could launch with a trebuchet.

@Felthry @troubleMoney But the internet isn't a big truck, it's a series of tubes.

So, a residential water supply line is typically 3/4" or 1" in the US, apparently, with 40-45 PSI being typical. Let's go with 1" - broadband! - and 45 PSI, and I think that comes out to about 40 gallons per minute.

At 15 x 11 x 1 mm (0.165 cc) per card, 40 gallons of SD cards is about 917,676 SD cards.

At 256 GiB per card, you're looking at 29.87 pebibits per second.

@bhtooefr @Felthry @troubleMoney

This thread started off great, but then kept getting better and better. Congrats all!

@bhtooefr @Felthry @troubleMoney
Hahaha So what's the total bandwidh of a cargo ship like the CSCL Globe capable of transporting 19100 twenty-foot containers (at 39k litres each)?
I suppose you would have to factor in distance from China to England for example, throughtput wouldn't be the same when shipping to Sydney.

@bhtooefr @Felthry @troubleMoney All this makes evident that a new unit is needed to measure bytes per gallon per mile (or bytes per litre per kilometer)

@haitch @bhtooefr @troubleMoney I think the most relevant unit would be byte-meters per second

@bhtooefr @Felthry @troubleMoney Are these calculations assuming that the SD cards fit together with zero space between them?

@ratamacue @Felthry @troubleMoney Zero space between SD cards, spherical cows, non-flying bumblebees, etc., etc.

@bhtooefr @troubleMoney Due to the irregular shape of microSD cards, I believe you could manage slightly more than the numbers I cited, possibly even 130% or 150% as much.

@Felthry @troubleMoney I'm fascinated by this; I wonder how efficient you could get the write and load process.

@Felthry @troubleMoney The amazon Snowmobile is a similar idea; albeit a bit less dense (I guess it's using standard hard drives and has all the power and controllers); it says it holds 100PB per truck:

@troubleMoney I assume a trebuchet could clear the top of the great firewall of China..?

tbh it's unlikely any network will ever beat a minivan travelling down the highway

Package loss ist no problem at this datarate i hope :D

@troubleMoney Increase it to 115.2PB now that 512GB microSD cards exist, but expensive.

@troubleMoney microsd cards in a pneumatic tube system would be awesome :D

uh, lewd Show more

@troubleMoney now this is the quantitative analysis problem I wish they taught in school

@troubleMoney what say you about packet loss in reaching the destination? 🤔🤔

@troubleMoney How many cards fit in a long range truck, or an airplane?

Also, i read somewhere that this technique (trucks and planes, not the trebuchet) is used by Google for replication between data centres.

I still think an ejaculation has more bandwidth then a trebuchet.

@troubleMoney I spent waaaay too long on this site ...

... trying to design a trebuchet that would achieve 300m with a 90kg projectile, so I could find out the flight time, so I could figure out the actual mb/sec bandwidth.

I gave up, but it was a lot of fun, and I learned way more about trebuchet design than I ever thought I wanted to.

@troubleMoney Never underestimate the bandwidth of a truckload of harddisks…

@ArnimRanthoron @troubleMoney true, like.. was it Amazon or someone else in US was doing that because it's faster last year or so

@charlag @ArnimRanthoron @troubleMoney Wasn't it Google, using motorcycle couriers to take Streetview data to datacentres..?

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