Could you survive this?

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Could you survive this?

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Жыл бұрын

Falling on static ropes is dangerous they say. It sounds painful, but how painful? We tested semi-static nylon rope, a very static polyester rope and a high-tech super static abrasion-resistant rope in the drop tower. Spoiler alert, some would kill you and that's only a fall factor of 0.3 or falling 1/3 the length of your rope. Falling with a fall factor of one (fall 5 feet with 5 feet of rope out) can break the rope, which still kills you.
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You're not supposed to whip on static ropes
01:23 What force is ok?
02:06 Fall Factor-ology
03:24 Dynamic Rope Test
04:19 Semi Static Rope Test
06:06 Super Static Rope Test
07:55 High Tech Static Rope Test
09:05 Know how much it Hz

Пікірлер: 273

@HowNOT2 Жыл бұрын

Our data is on our blog www.hownot2.com/post/static-whippers We now sell Linescales at our new store hownot2.store/linescale

@therealjackfisher Жыл бұрын

What happened to the other channel? I was looking for the awesome intro, and I get this instead.

@SgtSnausages Жыл бұрын

The Department Of Redundancy Department fully supports your usage of "hz per second"!

@grantdavis5992 Жыл бұрын

Back when I started out in electronics that would have been "cycles per second per second" or "cpsps." Then they took away centigrade and made it Celsius and cps and made it Hertz. That hurt.

@angrybirder9983 Жыл бұрын

That would be a correct unit to measure how fast a frequency is changing.

@hetistijmen Жыл бұрын

@@angrybirder9983 how derivative

@bradley3549 Жыл бұрын

I think the Department of Redunancy Department is out of their jurisdiction on this one. That's a valid unit of measurement, but used incorrectly. So the Department of Incorrect is taking over the investigation.

@SgtSnausages Жыл бұрын

Yeah. Not at all a correct unit of measure as used here.

@Sp1der44 Жыл бұрын

I love how how y'all really do the math and then also demonstrate to see how it compares. I think you did a great job explaining the myriad of variables like fall distance, time, rope length, additional slings / hardware, rope specs, and type. I also think y'alls scientific method is very good and thoughtfully executed. Great video!

@Gopherborn Жыл бұрын

I would love to see full-on research papers on these topics for those of us who are more academically inclined!

@BenjaminLovelady Жыл бұрын

The term you're looking for is "Jerk," in math speak it's the second derivative of velocity. In other terms, acceleration is how fast velocity is changing, and jerk is how fast acceleration is changing. The longer the amount of time HELD at an acceleration is actually WORSE, but the longer the amount of time taken to reach that peak acceleration is better. Your body can handle HUGE accelerations for tiny amounts of time, as it doesn't change the relative velocities of different parts of your body very much.

@plwadodveeefdv 10 ай бұрын

Wow I guess I do math more than I thought

@richardlumley2581 Жыл бұрын

Thank you for bringing up the sample rate point, as some one that used to break stuff for a living it's good to know you are fully understanding what's going on with your testing!

@ogi22 Жыл бұрын

Measuring stuff is difficult and a very huge part of physics and engineering. And those little things matter so much. As an example, i had a client with double head circular saw for cutting windows and door frames (two cuts at the same time). Most cuts are 45 degrees. And to cut the proper length, you have to insert the exact width of the part, machine will slide heads to the proper place and make the cut. And he claimed his saw was not cutting proper lengths with angle cuts. Interesting thing was that straight cuts were perfectly in tolerance. So i asked customer what width he is putting into the computer, and he said - the correct one, from the spreadsheet. The problem was that parts were also painted... and thickness of the paint was making a couple mm error in the length of the final product. And spreadsheet was giving dimentions of bare material, without a paint.

@dragade101 Жыл бұрын

@9:54, some excel beta: If you are looking to sample from the largest in your loadcell, excel has LARGE() and ROW() to help identify this (the syntax for sheets works differently). That you can plug in your array, lets call that A2:A100000 into: =LARGE(A2:A100000, ROW(1:N) ) This will return the N largest numbers. But wait! There is more. You can find the mean of this sub array. =AVERAGE( LARGE(A2:A100000, ROW(1:N) ) )

@tacticalflannel8523 Жыл бұрын

I am super impressed you learning digital sampling empirically. You will hear things like “Nyquist” frequency etc. but you are learning by doing.

@VICNCRAIG Жыл бұрын

This is just the video I've been hoping for! I use a semi-static rope for TRS, typically with a single device such as the Taz Lov 2 or CT Rollnlock, and backup knots. I've often wondered about just how unpleasant my day would become if I fell a few meters to the backup knot. It should be fine, but I'm still hoping I never have to find out. Keep up the science'ing my man, you're doing a great job!

@RegiKong Жыл бұрын

Ive never been rock climbing and dont think i ever will, but i find your videos incredibly interesting and fun to watch! Keep up the good work!

@chrissonnenschein6634 Жыл бұрын

I used to work in the elevator trade / lift engineering and your drop tower reminds me of an “inside joke” that goes: If you ever fall down the hoistway, grab the end of the electrical cord and throw into the hoistway to entangle on something.

@alexbernstein1812 Жыл бұрын

dude this is one of the best videos you’ve made, i love it!

@RopeLab Жыл бұрын

Hey Ryan (and all others). I unreservedly apologise for my brief and unhelpful comment on your video about sample rate all those years ago. No excuses. Keep up the great work. Richard.

@HowNOT2 Жыл бұрын

Thanks. I appreciate that.

@hydrodragonn7385 Жыл бұрын

Idk if you guys upgraded your camera, but the filming quality of this episode looks great!

@sobertillnoon Жыл бұрын

I love the personification of the KZfaq comment section.

@jaskiranism Жыл бұрын

What your looking for as a metric for "bone breakage" is impulse (average impact force)! "impulse = mass * change in velocity" so if you're falling at x velocity and stopping to 0 that will give you a fixed term for the impulse of any one person's mass. This is basically the change in momentum the person will see across the fall. Also "Impulse = Force * change in time" so if you increase the time taken for the momentum change, you decrease the force on the person's body.

@therflash Жыл бұрын

I may not have enough knowledge about this, but isn't this just force with extra steps?

@jaskiranism Жыл бұрын

@@therflash sort of but force isn't the full story. It's easier to think of it like this, saying peak force is like saying i went 100mph in a car. Factually true, but if you got to 100mph in 30 seconds, you wouldn't feel much. but if you went 100mph in 1.9 seconds, your stomach is gonna be in your throat.

@angrybirder9983 Жыл бұрын

@@therflash Force is change of impulse per time. F = dp/dt

@jimihenrik11 Жыл бұрын

At 4:10 you mentioned the difference between steel weight and body in fall tests. I just read an alpine safety classic book by Pit Schubert (it's German, so hard to recommend). There the Author mentions that the difference between testing with steel weights and a real body is about 50% (at fall factor 1). That may be an interesting topic for you to explore. Maybe you could even come up with a better test object than a steel weight. Let's say some sandbag with a harness on or something.

@serges201 Жыл бұрын

What fall length was that for ? I can't believe it would be the same for 1m/1m vs 10m/10m (both FF1).

@jimihenrik11 Жыл бұрын

@@serges201 in the book it says that a steel weight will generate a 50% higher impact at fall factor 1 for the same height.

@probablyinconsistent4756 Жыл бұрын

@@jimihenrik11 does the book give any data? Reference any studies? 50% sounds like a guess rather than an actual tested number. Especially given the forces involved, a few percentage points can make a big difference, so rounding to 50% isn't good practice and it doubt it was exactly 50. I'd also find it a little hard to believe it's that high of a difference. The human body is mostly water and does have an ability to absorb forces but 50% is huge.

@jasminebebe3455 Жыл бұрын

The concept makes sense since a body will flex and slump to take some of the shock out as opposed to a steel weight which does not flex or slump over a harness, taking some shock.

@The00000000000L Жыл бұрын

the 23 Hz isn't really right you need double the sampling rate of the frequency contends of the pulse. So the best way for you is to over-sample a lot to make sure not to miss the event. This is like deep EE. Cold you provide the raw data(like shown in the video (the csv or excelsheet)), so we can determine the actual frequency of the fall. This is a realy fun data acquisition problem .

@mausball Жыл бұрын

This. More sampling is best here. More data better. If you want to catch a 20hz signal you MUST sample at 40Hz a a MINIMUM. Look up Nyquist. Tat 550Hz for the fall factor 1 on the drop tower is wrong. It actually needs 1100Hz to catch, again, per Nyquist. There's some complex math in here, bare knuckles EE stuff, but it's real.

@tomgnyc Жыл бұрын

I thought their methodology was pretty good. And 40 is almost double 23. I'm guessing they got very very close. You could probably do some interpolation and get a bit closer still.

@cdezzz Жыл бұрын

@@tomgnyc it was super good enough!!

@tobiasbrewin4355 Жыл бұрын

This exact problem is solved in audio engineering, it’s called Nyquists law, you need to sample at 2x the fastest signal you’re measuring

@largeformatlandscape Жыл бұрын

Worst case scarily would be a square wave where peak force lasted for t seconds. If you then sample at 1/t you’d always pick up the peak (well - I’d recommend 1/t*1.00001 to play it safe). Don’t forget, we’re not trying to reconstruct the square wave (which would require infinite sampling) only to pick up the maximum (which requires less sampling than a sine wave)

@MoritzvonSchweinitz Жыл бұрын

Safety harness gear have this part of sown rope which is supposed to break in case if a fall and lessen the peak force when falling in static rope. Might be interesting to test how well those work!

@forresthsu582 Жыл бұрын

Climbers have a similar thing (Yates screamer), but it's more to protect gear placements. Maybe throwing one of those into your system could make leading with a static rope in a pickle safer?

@louisbrown7383 Жыл бұрын

This one has me laughing along with great info I've always wondered about. Thanks for all you do!

@groundpounder24365 Жыл бұрын

Would love to see some arborist rope tests, xstatic,drenaline,tango ivy, Cheryl bomb just to name a few. love the channel

@danielmullins7883 Жыл бұрын

A lot of work and thought on this one - makes me want to carry an extra Volta or other fully dynamic backup. I'm too old to shake off a "semi-static" whip of size. That 700 footer was awesome to see! Yeah, the sampling rate and true anchoring methods add credibility to the peak no.'s. 👍

@Bidouillechurch Жыл бұрын

I'd love to see drop test results on one strand of double and twin rope !!! Thank you again for your work

@largeformatlandscape Жыл бұрын

If you have to climbing on a static, put the belayer about 50ft away from the base of the climb so you have way more rope in the system. This is the same on a second pitch, make the hanging belay well below the anchor

@mthudon Жыл бұрын

Your vids are getting g way better, Ryan.

@ichwillquark Жыл бұрын

I would love to see a test where the first "piece" breaks or blows at a certain force, recording the force on a piece below that. Probably a nightmare to set up as a repeatable and comparable test, but I always wondered what the numbers are.

@NoName-OG1 Жыл бұрын

I’ve jumped off a bridge with static rope ( one strand 5’ longer in a combat repel exercise in the military) - I survived, but my back still aches when I think about it…

@exicx Жыл бұрын

This video is hilarious lol Does using a more static rope increase your hurtz?

@theatermusic87 Жыл бұрын

Arborists climb on ropes that are super static. We really try and stay before 2.5%... all of our elasticity comes from rope in the system and dynamic flex in the trees we use as anchors

@Sicnus Жыл бұрын

Look at you getting all snazzy with produ ction value and such. Love it Ryan!

@dragoscoco2173 Жыл бұрын

On the 5 by 5 feet versus 50 by 50 feet, I would wager the 50 will show up slightly less force due to aero drag. But I hope to be pleasantly surprised when you post that vid.

@dmitripogosian5084 10 ай бұрын

On a five feet drop you do not yet reach terminal velocity, your speed of fall will be faster after 50 feet fall

@dragoscoco2173 10 ай бұрын

@@dmitripogosian5084 You do not reach terminal velocity but enough for aero to start having an effect. And as speed is nowhere near the velocities where it starts to affect results on impact it should be the same. To understand this I'd recommend doing the math that results in the fall factor equation and not the fall factor equation as that is a simplified version for climbers that should never do complex math while hanging from a rope. So weight falling in gravity suspended by a rigid rope and spring system, preferably formulaic without values. And you can ignore aero at first and include it later to see the difference.

@dmitripogosian5084 10 ай бұрын

@@dragoscoco2173 So, neglecting air drag. I fall from height H equal the length of the rope L, My kinetic energy when rope starts to stretch is mV^2/2 = m g H, is equal to 1/2 k x^2 where x is the maximum stretch and k is spring constant. So we get maximum stretch being equal to x^2= 2 mg H/k. However spring constant itself is inverse proportional to the length of the rope, which is height of our fall, so k ~ 1/H., and we conclude that we stretch is proportional to height x ~ H. But the maximum force is F =k x ( Hooke's law), so F ~ x/H and is independent on fall height H. But if we take longer fall, kinetic energy will be a bit less than mgH due to air drag, so x and force will be a bit less. Is that what you mean ?

@dragoscoco2173 10 ай бұрын

@@dmitripogosian5084 Pretty much this. As usual everything is a bit more complex in reality but it should agree to experimental results quite well. Nice work. As to things hard to predict and compute I find that rope has damping properties (never specified) and those are sometimes speed dependent, also they do max out at some point and change the properties of the rope due to temperature.

@Twopennysau Жыл бұрын

As a canyoner. If it’s all you have, it beats pancaking…. If it’s an emergency situation and you need to escape, you will die if you stay where you are, you can free climb and die if you fall, or you can climb trad with static & maybe end up with life with a potential spinal cord injury. I’ll take life, even if it involves tons of crappy stuff.

@danielcgallagher Жыл бұрын

Not sure if you've done this; I'd love to see a video on the force seen on the climber and on each piece of gear when sequentially blowing trad gear. At 7:00, you say "you would blow that piece of gear and fall on your next one, generating even more force." Maybe I'm not correctly understanding what was said (and maybe it also only applies to static ropes), but I would think the first piece of gear would see the greatest force and each subsequent piece would see less since the force of your fall is being partially absorbed when the gear pops (i.e. assuming reasonably closely spaced gear).

@eriksjoberg8991 Жыл бұрын

But you are not supposed to take falls on a static rope. You are not supposed to do that. You are not doing it right. It's dangerous.

@Retard_69 Жыл бұрын

Bruh the start lol

@danielwendell542 Жыл бұрын

Excellent presentation and explanation! Love it.

@Stevieray55 8 ай бұрын

great job big no doubt hope Ur channel grows huge I once broke my back in 7 places in a 30 to 35 foot fall and slightly over ten yrs later feel like I'm recovering

@Gunbudder 10 ай бұрын

2:49 back of the envelop physics backs this idea up. the kN you impart on the rope are going to be a direct result of how much acceleration you got before you "hit" the rope. the longer you are in free fall, the larger the force for a given mass (your body). but it also seems that how much rope in the system plays a huge role too, which seems to be why people talk about the factor so much. a short length of rope getting hit a little bit hard seems to be about the same "safety" level as a very long piece of rope getting hit very hard. this makes sense because the longer the rope, the more stretch, and the more time the rope has to slow you down while stretching.

@hanelyp1 Жыл бұрын

For a long fall aerodynamic drag becomes a factor. For a very long fall "terminal" velocity, the speed at which aerodynamic drag equals weight, enters the equation. If you have enough elastic rope, at the same end as the weight, to handle that energy you should be good.

@willie92708 Жыл бұрын

I'd love to see testing like this, but use an ATC with a person holding the brake hand (with a belay glove to prevent hand burns) for the belay device instead of the Grigri. Because, I don't use Grigri for belaying lead climbing (except on slow aid climbing pitches), and I would never use a Grigri for lead belay when I had to lead on a "static" rope. When I have led on "static" rope, I made sure my belayer had the bare minimum belay device friction to get the job done (like a figure 8 in "sport" mode). BTW, for short falls on "static" rope, body compliance makes a big difference in peak force, but you already know this when you did your short falls on slings connected directly to bolts.

@PotooBurd 9 ай бұрын

This is so important! Thank you for sharing 🌻

@oneilljames1 Жыл бұрын

I have that same yellow with orange/green tracer dynamic 9.8 Sterling rope. Everytime I bust it out at a crag someone has too make fun of the color lol.

@stibbits7087 Жыл бұрын

Would love a video discussing what happens to someone in a harness when they are subjected to various amounts of force. Like, if my harness is rated to 22kN, what would actually happen to me if I experienced a force of 22kN on my belay loop? I realise it's not something you can feasibly test, but maybe you could talk to someone who knows physiology…?

@celuler22 11 ай бұрын

Ur back is not happy

@Otherhats Жыл бұрын

Used to work construction, guys used worse than a static rope. Was an old woven rope, nothing close to modern. They were 4 floors up, and I was just like, yeah guys, you're DEFINITLY safe.....

@tomdchi12 Жыл бұрын

That grigri to bolt is certainly “conservative”. I’d love to see how much lower the peak forces would be with a squishy human belayer and harness anchoring the grigri. Not that it would make it ok to whip on static line, but I suspect peak loads would be (statistically) significantly lower.

@ronl7131 3 ай бұрын

Great that technology has advanced, since the “old days”. Fantastic equipment out there.

@bonzey1171 Жыл бұрын

Super interesting info on the sampling rate, keep up the good work, this stuff is very cool

@KNIGHTJUMPS Жыл бұрын

HowKnot2 Highline missed opportunity. Now we need a parody channel.

@hansonlife9465 Жыл бұрын

I loved the Hz discussion.

@jeffreyblack666 Жыл бұрын

It shouldn't matter too much how much time it takes for the force to be applied. What would matter is how long the impulse needs to be applied. The point of a dynamic rope is that it stretches to allow you to keep on falling applying a smaller force to slow you down the same amount but over a longer time.

@moldybread2445 Жыл бұрын

Anyone who's played Fleeing the Complex from the Henry Stickmen games knows what might happen

@wyattjones4161 Жыл бұрын

Have you done tests involving blown gear? Like what happens if a piece blows during a fall and you fall to the next piece

@T3H455F4C3 Жыл бұрын

I took a bit of a "whip" on a static rope. Wasn't even uncomfortable. However I didn't fall straight down. I was mostly a swing.

@paulelledge8977 2 ай бұрын

This makes me wonder if I should use dynamic rope for my personal edge kit as a technical rescue tech in a large regional system.

@perryfire3006 Жыл бұрын

Love your channel. And I think you should do a collaboration with that "someone" who left a comment. Both of you are doing wonderful work.

@diskdrive123 Жыл бұрын

Convert Hz to time, than all your references are in the same unit. Than its just a matter of which one is bigger/smaller to why it works.

@pavlodeshko Жыл бұрын

it's crazy how close those peak load numbers are to rope's mbs (with knots) - you barely have x2 safety factor. So basicly its dynamic properties, whatever they are, is the only reason it can survive a fall on it

@averissimo Жыл бұрын

Can't get enough of this!! Great content

@dirtydogvideo Жыл бұрын

A hertz is what happens when you fall on a static rope! 😂😂😂

@Nightwishmaster Жыл бұрын

This one. This is the comment.

@MephistoRolling 5 ай бұрын

You could save yourself a lot of time with formulas in excel, count max etc.

@pieppy6058 Жыл бұрын

The unit "Hz per second" measures a change of frequency. therfore saying "we were reading at 40 Hz per second " doesnt mean anything

@AlaskanInsights Жыл бұрын

yah ouch.... fell about 10+ feet in a swiss seat . hanging from a piece of sta-set x. has very low 2 percent stretch. peed blood for a month.

@nohands3255 Жыл бұрын

That's why we use a asapsorber with static rope with rope access

@w0ffleir0npr0ducti0n Жыл бұрын

What about static ropes like the petzl RAD/PUR lines, especially compared to something like the Edelrid rap line which is designed to do the same thing but has a "dynamic reserve".

@k2thah286 Жыл бұрын

Or Beal Rando!

@nikonmikon8915 11 ай бұрын

Potentially un-useful comment here: sample rate has another caveat, the highest frequency you wish to capture must be HALF the sampling rate. This is called the nyquist frequency. If you ignore this you will be met with aliased data which also gives incorrect measurements/replication (in audio). Simple example: Humans hear 20hz to 22khz. Nyquist freq is double 22khz in order to faithfully recreate 22khz in the capture, ie.e 44.1khz (looks like a familliar number no?) So what this means is, if there are multiple pressure spikes and their frequency is under half your sample rate, you will not see them AT ALL. They will be invisible in your final data.

@tobiasbrewin4355 Жыл бұрын

You make an interesting argument at 5:12 that high forces on the body are less bad when they build up slowly. This doesn’t sound right to me, in previous videos you’ve shown that various items break at roughly the same force on the drop tower and slow pull machine. Why would it be different for a body? Surely pain is directly proportional force

@largeformatlandscape Жыл бұрын

I think your body reacts by engaging core and muscles, providing shock absorption, a fast force will get you before your body tenses and go straight to your joints and back

@tobiasbrewin4355 Жыл бұрын

@@largeformatlandscape Good point, seems like it needs testing. I think Ryan should take a series of ~6kN falls on increasingly static lines and make a graph of the resulting bruises

@Bacantor74 Жыл бұрын

@@largeformatlandscape The time derivative of acceleration "Jerk" is a measurement that can be used to quantify this.

@serges201 Жыл бұрын

I had the same question, but Benjamin Lovelady elsewhere in the comments pointed out that increasing the force gradually gives your body time to get in a better position for withstanding the force.

@ronl7131 3 ай бұрын

Interesting vid. Thanks

@Disinterested1 Жыл бұрын

the thing about force over time best way I found to explain it is this if you stop in a car you stop over time if you run into a brick wall you stop quickly have a great day :)

@brandonswan9247 Жыл бұрын

Have you tested impact forces on different materials? For example your non-human test was a hunk of metal. what forces do you get with equivalent masses of bag of sand vs a human? If the sand is more similar (I imagine it would be) then non-human tests should be done with a bag of sand, no?

@sixfigureskibum Жыл бұрын

We do not climb trees with dynamic ropes. Only statics ...I'd say same as canyoneering. But free climbing lead ...you don't want to run out more than 7 feet

@nic1586 5 ай бұрын

are you still working on testing for factor 1 and 2 falls for multipitch id love some info on the forces and dangers on harnesses bolts and other gear as thers no information on it

@MrBjorntsc Жыл бұрын

Fall speed isn’t linear with height. More rope at a 1:1 will be lower

@AdamFoster Жыл бұрын

I don't see any tests for the Kong Energy Absorber. I'm curious about how it would work for lead rope soloing or some such.

@spambot7110 2 ай бұрын

10:17 to be fair, at 40Hz you would've gotten only a couple samples at the peak, which IMO leaves a fair bit of doubt about higher frequency forces. of course now you can reproduce the test at a higher sample rate, measure the frequencies, and retroactively confirm that 40Hz was valid. but at the time, without the benefit of the low frequency data available, I think it made sense to question it. one of those annoying chicken and egg problems where 40Hz was super good enough, but you could only verify that *after* getting something way faster

@jasminebebe3455 Жыл бұрын

Had a tripod collapse during training doing high line and three of our firefighters were injured.

@jasminebebe3455 Жыл бұрын

It was probably only a 3-5 foot drop

@PhilipNation-xm5lh 4 ай бұрын

Thanks!

@elijahlord Жыл бұрын

Recently got myself a static rope which I intended to use to start lead climbing. Guess I'm going to need to buy a dynamic one cause I like my back.

@Jschroeder1011 10 ай бұрын

I would love to see some tests geared more towards saddle hunting. Most climb with static rope and your anchor point is in some shape or form girth hitched onto a tree, this means while climbing up, your tether will be around your knees or feet and I’m curious how a fall like this would be

@briananderson6758 Жыл бұрын

As a retired tree trimmer speaking, majority of tree trimmers climb with static ropes fyi.

@HowNOT2 Жыл бұрын

How often are they taking falls from above an anchor point?

@adamnash2009 Жыл бұрын

Danger: Nerdy aliasing / sample rate comment incoming. You actually need to sample at double the fastest transient to be certain that your peak force sample number is accurate. Imagine your readings are 5,7,9,9,9,9,8,6. Peak force is 9- but if your sample rate combines 4 values, you could have a group of 5,7,9,9 and a second group of 9,9,8,6, rather than a group of 9,9,9,9. Cut your sample rate in half so it's only combining 2 values, and all is well.

@ArthurT22 Жыл бұрын

I just love yours sciences' brow!

@Bless.08 Жыл бұрын

Me : Watching this understanding nothing. Also Me: wacthes till the end

@Survival-gyver Жыл бұрын

A falling climber on a static rope should get a pretty bad amount of g-force, from the sudden stop. But is it enough to main or kill? can you check G ratings?

@ABaumstumpf Жыл бұрын

Depends on the fall - might even be enough to snap the person in half.

Жыл бұрын

40Hz for 23Hz is not good enough. Good enough will be >= 46. But its close. Check the Nyquist-Shannon sampling theorem.

@target844 Жыл бұрын

I disagree, the Nyquist-Shannon sampling theorem is about reconstructing sine waves. This is about just measuring the magnitude. If it is long enough so the peek force is 1/23 of a second you only need to sample at that rate to get at least a single sample for when it s at the peek force.

@gdubya03 Жыл бұрын

57 seconds in and I'm laughing my ass off. Love the skit you did with yourself. I just wanted to "like" that. okay I'll continue watching now. Byeee

@MikeulHughes Жыл бұрын

Love the intro man it was gold

@pyalot Жыл бұрын

wondering if somebody made a harness that has built in a small rope spool and friction joint to act as a „fall airbag“. Whenever the force exceeds a limit, it would pay out from the spool. Matched with the climbers weight, it limits the g-force (until the spool runs out). 2-3m of g-limited fall might get you all over the high g peak and change back broken to it was a bit uncomfortable… Combined with a spring returned one way clutch, it would auto reset after a fall and no more tension on the rope, so that a climber can continue their way but still have the safety of the airbag for subsecent falls.

@skylark.kraken Жыл бұрын

9:25 40Hz per second? 40 samples per second per second? Thought I'd add to the hurtz

@lorenzomutal725 10 ай бұрын

wait how can you fall twice the distance of rope you have in the system? like how is that possible? (can you provide an example?)

@eduardobicudo4553 Жыл бұрын

Nice Sprat t'shirt!

@SaberSoft Жыл бұрын

Was in a class and the instructors where preaching how important dressing knots is. Do you think you could test dressed vs undressed knots?

@PFMediaServices Жыл бұрын

I feel like he's done this, to some degree, on figure 8 knots at least. But would love to see more knots tested for this.

@TheStupidcomment Жыл бұрын

I think the channel 'hard is easy' did some tests along those lines. If I remember correctly.

@erissalvidea6220 Жыл бұрын

this generates a lot of questions about the differences between dynamic rope cows tails and sling/cord made personal anchor systems. does it really make a difference when they are as short as the are? plus you are tying knots on the rope and reducing its strength while there are other systems that do't require knots. I've used both on work, but I've never fallen so can't say 😅 Friendly reminder: always work with a backup fall-arrest system that dissipates the force. Don't get yourselves killed at work, that's too sad. at least do it on the mountains🤙🏻

@froozynoobfan Жыл бұрын

i was once route building, on a dynamic rope, i knotted the rope at the top to reduce the stretch when building, now on the last 3 meters i was working and some test climbing and i had maybe 1m-1.5m slack on the last 2m from the anchor, yep that was not a pleasure

@pavlodeshko Жыл бұрын

falling off several quickdraws up is really the best case scenario for lead climbing, so i doubt it should be considered for safety concerns.. someone could deside 6kn on semistatic is survivable "to get out of a pickle", climb, fall at first piece and break the shit out of something with high factor fall, not cool