It’s a super old unit of measurement for mass [0], idea being that a “grain” is a single seed of wheat etc.

1 gram is a little over 15 grains, and there are 7000 grains per (avoirdupois) pound.

0: https://en.wikipedia.org/wiki/Grain_(unit)

It's a unit of mass used in the firearms world

325 mg aspirin pills were originally 5 grains. A carat was 4 grains. The unit was used by apothecaries, jewelers, and bullet makers.

Slow Mo Guys have a Phantom that rocks up around 1.5 million FPS. They've used it to show how glass cracks etc. when you get to that speed though, you need a LOT of light, and a very low resolution.

Scientific research systems like the SCARF achieve 156.3 trillion fps but at greatly reduced spatial resolutions.

I’m not sure dropping 50 kg 4 feet… is my idea of demonstrating the ridiculous amount of energy stored in something…

You'll shoot your eye out, kid.

I could for sure see it being used to launch seeds-bombs, or emergency rations, or make a pressure wave on a snow overhang - if the evolution of this interesting experimentation results in a portable version, it would be immensely useful. As a crop protection device, given some kind of energy-harvesting recharging method, a la wind.

A bit of imagination makes it very useful.

All such weaponized technology carries the weight of danger, but de-weaponized technologies - which is what this represents to me - could mean some break-throughs, too. There are a lot of peaceful applications for a trebuchet.

And yes, it'd need training, but its not the training part of explosives training that I think needs to be rendered obsolete, but rather the explosives manufacture and distribution network, or in other words: peaceful applications for a trebuchet.

Well, depends if killing the animal means having an actual ecosystem functioning again, afterwards. Some animals are living in the wrong place in the world; culling them requires special skills.

I get it - animal murdering is cruelty, mmkay .. but so is a wild boar, ripping up wombats and quokkas and witchetty grub-bearing paperbark trees ..

Anyway, I do see far more peaceful applications of this, if it becomes efficient and deployable. Could be a good way to launch things at sea, for example.

Or even certain forms of glider.

If the trebuchet is breaking the sound barrier, a small fleet of trebuchets set in place on the snowfield and set off in an appropriate wave beam, could provide less explosive-manufacture-distribution-usage solutions to the problem.

I could imagine this thing gets even more efficient and resilient, attains some kind of wind or sun-based auto-recharging mechanism, and then deployed on mounted areas to shock-wave snow layers. Yes, its possible, no its not real until someone does it. I could imagine it being done.

Note: I also like the idea of not having to use explosives, is the starting base. If you would prefer to blow stuff up, that's not what I'm talking about.

The evolution of this technology towards an automated, resilient, field-portable version would be interesting. Imagine having a 6-pack of them.

> I'm not reassured that we need this warning for people allowed to handle that.

Not sure what type of explosive that is but the rumour is that C4 when ingested gives a high similar to alcohol. Or at least that is what some troops believe.

“Amongst field troops in Vietnam it became common knowledge that ingestion of a small amount of C-4 would produce a ‘high’ similar to that of ethanol, and it is possible that this was the reason for this episode.” From the clinical description of a c4 poisoning case.

https://pmc.ncbi.nlm.nih.gov/articles/PMC1279680/

like a potato cannon?

I helped design the "reloadable" part of a golf-ball shooter that used acetylene as the accelerant. I don't think it went supersonic, though. There's videos (embarassing ones) on youtube. He eventually designed one that can shoot full cans of monster energy hundreds of yards.

the reason i bring it up is we used to design and build pneumatic ones, that could send C and D batteries thousands of feet if you arced it right. that was with ~125psi, we always wanted to build out to 200+ psi, but instead went into accelerant-based cannons and he got a job doing machine drawing with autocad. the rest is history.

edit: https://nextcloud.projectftm.com/index.php/s/cobra5x we show off the part i designed, toward the end on the "reload" - he designed and built the entire thing.

I think the cycle time on this would be far superior to a pneumatic system: cycling this system effectively means lifting ~100 pounds ~8 feet, which a reasonably fit person (who could reach that high) could do several times a minute for extended periods.

He got an efficiency over 40% (if memory serves, I watched this video yesterday) -- I wonder between pumping and discharge how efficient a pneumatic system would be, but I can't imagine that it's higher.

Basically anyone can go buy a pellet rifle that will easily and consistently clear 1500fps. They're still pretty cool, and will go through both doors of a car

I dunno, takes a lot of energy to get a pneumatic system up to the same speeds that this trebuchet can accomplish. I see it really as a super-efficient machine requiring very little effort to load ..

But yeah, the fact that it's super cool looking - and sounding - is a key factor in my willingness to play with one too, one day. ;)

Hemp ropes are quite strong, they've proven themselves for thousands of years in marine applications. You definitely need more thickness to achieve the same breaking strength as dyneema or steel cable but at slower speeds and higher projectile masses the aerodynamic consequences of a thicker sling rope might not matter so much. As for the "drive rope" for lack of a better term (the one that transfers power from the falling weight to the rotating drum) that one can be basically as thick as you like.

No, I understand, it's the claim from the very first sentence that "gravity itself seemed to forbid" (reiterated later in the text) that annoyed me. It's just making up a non-existent obstacle to hype up the result.

Of course, but there is a continuum between "I spent years tackling this complicated problem and the solution will benefit us all" and "I've entered the same McDonald's drive-through 1000 times in one day to order always the same thing". Some achievements are closer to the first end, others lie more somewhere in between.