We’re sketchy… so you don’t have to be
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- Опубліковано 10 лют 2025
- In a cave, can you rappel 2 at a time? Can you ascend 3 at a time? Can you drop a rock and not hit your friends? Can you drop the rope or will it shock load the anchor? We were sketchy so you don't have to be.
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Alex - Cantrell Caving
youtube: / @cantrellcaving
Insta: / cantrellcaving
Ryan - Underground_Adventures
YT: / @underground_adventures
Jacob - Mineral_Dude
YT: / @mineral_dude
IG: / mineral_dude_
Wes - CaveZip
YT: / @cavezip
IG: / cavezip
Gustavo
YT: / @ghostofpigeon
IG: / thisisgustav
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no sir i will not be going into the cave of doom to do sketchy "crap"
Physics hits harder when it takes over 6 seconds to hit bottom, wow!
(A little timer in the corner of the screen could include approximate velocity)
So over 176.58 meters deep, impacting at over 58.86m/s, or 211.9km/h, or 131.7 mi/h (not accounting for drag)
"My thumb hurts." haha!
i shattered my right wrist in a 14 ft fall, good news is that ive been using a trackball eversince!!! my thump has 8pack abs :)
@@carolinafrog4365 Eeek!, wow that's gotta hurt. I'm happy to hear that you're mending well!
More caving content please!
Personally watching a man in front of me crawl face first into a hole that turned into a big drop and then fly down it is the reason I started learning how to Aussie style. That man was Wes... p.s. Learned a lot from this channel and love it by the way! Also appreciate when you do caving content!
I've been following you since the beginning.I find all of your videos useful but living in North Georgia caving is my jam! Love love love this video! Please give us more! Can't wait to get my hands on a drill powered ascender since I work in remodeling.
Ali Express for your wants (backup is always a great idea)..
- hack, A "Maasdam rope puller" (3/4 ton) modified to swap pull bar for 1/4 hex - or a 12mm Axle with adapter if preferred.. - going up, a leading Klemheist or other directional friction hitch works for "progress capture "/ fail safe - throw some ascenders / rope runners into the kit bag....
Nb, Sport climbing isn't safe - in the OSHA meaning, to start with.
This easily goes in the top 5 videos on the channel, I would kill to be there with y'all
@error.418 this is now my favorite video 🩵
Yay! More caving content!!
@@hunterklein9892 yes yes yes
WOW! the new Z3 looks amazing, solving almost every issue i have with my z2. i hope i can grab one when you offer the preorder!
Wow... From this height the stone fell around 6 seconds and hit the ground with approximately 59 m/s ...212 km/h or roughly 132 mph (air resistance aside). Calculation has been corrected after one day, after a helpful comment. I am sorry, I screwed up.
Fear of heights gets a new perspective here, I guess.
Perhaps going down might not as scary as going up🤔💭? If you said, it is safe, I would trust you a tried to enjoy the ride😄👍🏻. Again...wow😲!
Stay safe 👍🏻😊👍🏻!
How did you calculate that velocity?
No, it’s 59m/s, or 212km/h
@ I am sorry. Normally, I do make sure the numbers are right. Perhaps I got distracted by the deep fall. Yes, you are right. I feel ashamed, of course. Thank you for your given correction.
@sportenapfeltorten2095
Hi there. I use the small formulars to get the results I am looking for:
Explanations: S = distance
s (small) = seconds
a or g = velocity (g is gravity) in m/s^2
t = time (in seconds)
V = Speed (linear or average)
Vmax = maximum Speed
V = a/2 x t (half the acceleration!)
a = g = 9,81 m/s^2
Formulars:
S = V x t
Vmax = a x t or g x t
V = 1/2 a x t
S = 1/2a x t^2
The height is given with 178 meters.
You need the time of falling to get the Vmax with the other fomular.
S =1/2a x t^2 ; S=178m
178m = 1/2a x t^2 ; x2
356m = a x t^2 ; a=g = 9,81 m/s^2
356m / 9,81m/s^2 = t^2
36,28...s^2 = t^2 ; square root
6,02...seconds = t
Time of free fall is about 6,02 seconds
(if you don't mind any air resistance ;-) )
Now you are almost there.
Vmax = g x t ; t = 6 ,02 s
Vmax = 9,81 m/s^2 x 6,02 s
Vmax = 59,05...m/s
You want km/h or mph? Okay.
m/s x 3,6 = km/h
km/h / 1,6 = mph
Here you go.
59 m/s x 3,6 = 212,4 km/h
212,4 km/h / 1,6 = 132,75 mph
That is it.
The speed that an object will hit the ground from a height of 178m will be approximatly 212 km/h or 132 mph
Enjoy and have fun.
Those 2 fomulars have been much usefull for me during the last decades ;-)
@sportenapfeltorten2095 Sprichst du deutsch?
Egal... ;-)
My first long answer just vanished mystically. Sometimes you begin to get angry about UA-cam for such things.
There are 3 simple formulars I use.
S = V x t
S is distance in meters, V is average speed in meter per second (m/s), t = time in seconds
Vmax = a x t
Vmax is maximum speed, a is acceleration and equals gravity with "g" . g = 9,81 m/s^2 .
V = 1/2 a x t
Half the acceleration times the time of movement equals the average speed
S = 1/2 a x t^2 = ( 1/2 a x t ) x t = V x t
Compare with the formulars above. It is almost the same with different variables ;-) .
Calculation (simplified):
Height is given: 178 meters
a = g is gravity with g = 9,81 m/s^2
To get to the maximum speed (Vmax), you need the time of falling.
So only the last fomular will get you there.
S = 1/2 a x t -- only t is unknown
S= 178m ; a = 9,81 m/s^2
178m = 1/2 (9,81 m/s^2) x t^2 -- multiplicate with "2"
356m = 9,81 m/2^2 x t^2 -- devide with "9,81 m/s^2"
36,28...s^2 = t^2 -- square root
6,02 s = t -- make sure the numbers are right. Time "t" has to be "s" or something went wrong.
Now you have the time of free falling, with t = 6,02 s .
We assume, that there is no air resistance here. A small and heavy stone might fit into this assumption decent enough :-) .
Insert t into the formular.
Vmax = a x t
Vmax = a x 6,02 s = 9,81 m/s^2 x 6,02 s
Vmax = 59,08 m/s
You want km/h or mph?
m/s x 3,6 = km/h -- bacause 60 seconds times 60 seconds is 1 hour --> 3600 s . And 1000 m is 1 km, so you have to just multiplicate m/s with 3,6 to get to km/h . Simple, isn't it.
km/h / 1,6 = mph -- 1 mile is about 1,6 km. So you just have to divide km/h with 1,6 to get to mph . There is no magic about it.
Vmax = 212 km/h
Vmax = 132 mph
Hopefully, this might be helpful for you.
Thank you for asking.
Have fun :-)
Someone is gonna be mad about that rock.
Fantastic! Great video!
Nice, did you know they were at fantastic pit when you posted this?
Definitely getting in the z3 preorder!
Cool testing! Great insight
“This is fantastic”
Yup
Stoked you got to crawl in a hole with turtle farmer! Love your videos!
😎
loving the dual headlamps - was curious what lights everyone was running
@@VCmakes Fenix are the best!
They look like Zebralights to me.
Fenix lights all the way.
Zebralights for me
@ my brother in Christ I was there😂
6:00 there's a myth to do can throwing the rope then getting caught around an ankle pull a person with it.
Great video! Trandem climbed Incredible once with two of us on rope walkers and the bottom guy on a frog. I don't recommend that mix. The two of us on rope walkers were getting cold from wind/water because we were moving too slow to keep our bodies warm. We couldn't just climb ahead because we didn't want to get so far up that if we accidentally dropped something it could fall dangerously fast for the poor frogger below us.
Gustav!!!
Nope... still sketchy
Shock loading the ceiling bolts right before I go there…Nice, I’m repelling the balcony
do you realize we generated more force on trandem than the drop? It's not enough to actually shock load the anchors like you think, that's the whole point of showing this.
Yep 2 people(150lb) frogging is 3kn . But I'm sure that repeat 3kn is somehow different from the 3kn created by a rope drop.
Did you repel to Australia?
Can bolts take more load when they’re placed in vertical walls vs a roof? I.e. when they’re pulled at 90 degrees to the whole that’s drilled, rather than pulling them straight out. Thanks!
In most test he has done (you can watch the all) the bolts are stronger in shear than straight out.
It can vary, due to bolt type, design, and substrate type/quality. E.g. Our brand's hangers break at about 32kN in shear testing with our 12mm sleeve bolts. In our tension testing, the bolts break instead around 50kN. In the testing of our prototype glue-in , we got 40kN in shear, and almost 50kN in tension. It's worth mention that the EN959 standard for rock anchors have a min of 15kN (UIAA123 is 20kN) in tension (axial testing), and 25kN in shear. That's because tension testing really puts more of the design + quality of the installation to the test.
hmmm maybe I am wrong, OR I remember right, and in tension the rock often fails sooner than in shear.
MMMmmmmm science!
god that looked like fun!!!!
This is awesome
Whats up Wes!!
❤❤❤ what up bro! Epic trip!
the more guys on the line the less bars needed in the rap-rack..
yep I guessed the shockload on the whole line whipping out at 3kN - a 10x on the mass - shock loading, about the same as 3 guys on the rope, a dynamic damper (a short 6 tonne round nylon sling - dynamic / nylon - ?? interesting..) at the anchor could eliminate the shock..
You really wouldn’t want to use dynamic anything on a caving anchor, especially on this pit in particular. The bounce on the way up would be miserable.
The zee 3 looks cool. Do they make a zed 3 for the UK market?
Soon, working on CE certs
Cave? Nope. Comment and upvote for Ryan? Yup! This concludes my report.
This was fun.😎
On the tadem rappel. How does the top person do a change over to climb? Or a full lock off of the rack? Correct me if I'm wrong but this seems like how not 2 😅
SRT is definitely not for everyone. 😎
Just jamming the bars up on the rack will stop the upper rappeller - no lockoff needed. Note that a longer rack (24" instead of the typical 18" rack frame) was needed to allow the upper person to move. It would be more work to get the rope shifted to release the brake bars. Having the rack on its own 'biner would allow one to abandon it and leave it behind in a desperate situation. Tandem rappelling likely should be reserved free drops like this fantastic open pit, not a drop where one needs to deal with falling water, loose rocks, multiple lips, ledges and slopes.
@@davidseslar5798 great answer. I'd also add the persik he noted in the video would allow him to stop, tie off, and maybe retrieve his rack. plus he has a hand ascender (full frog) already attached and ready.
@@davidseslar5798 great reply. I would just point out the persik that was shown. And it's ability to stop, tie off and change over.
Caving in countries that arent england and you can wear a t shirt 😮
Im so jell 😅
I’ll beat the z3 climb time soon. I already beat the z2😈
Need to rig a side-by-side race! You should also freeze the Z3's battery to it runs out of charge lol
@ no need. The z2/3 take roughly 20 minutes to ascend the 586’ (extremely impressive) I can climb the pit sub 18, I just might puke at the top😂
We might race just for a video one day😎
Do you know what size battery is needed to not run out of charge at this length?
Hell naw give me a ceavass riddled glacier or a knife edge ridge anyday even a chossy mixed line will do but screw splunking...... naw I'm good.
Good old walker county ga.
What rope was used in the video?
Sterling HTP 3/8" - we have several colors in stock
@ it’s interesting how bouncy it was for you. I wonder if 10.5mm KM III would be better?
@ at the depth we were at and the weight we had on the rope, the bounce was almost exclusively at the bottom of the rope. There wasn't much for me after 200ish feet in the air!
Yeoowwww
Good do see you underground with Wes
What up! ❤ That was an epic trip down under!
The Grotto folks are NOT going to like this one lol
😂😂😂
They won't know what to be mad about since we proved their fears aren't real!
Why did cavers use the rack style ascenders instead of something like a Gregory or a mad rock?
Just the weight of ~600 feet of rope when at the top of a big drop greatly increases the resistance of any DEcender and most devices would require the user to lift the rope to move a few inches. Often referred to as stuffing rope, this is hard work instead of the effortless down-rope glide desired. With a long rappel rack, one weaves the rope through multiple bars which can now be widely spaced - reducing resistance to slipping on the rope - at the top of the drop. As one descends and the rope weight is reduced, the bars can be slid up the rack to lessen their spacing and increase their resistance to maintain the desired speed. This essential ability to widely vary resistance is not possible in a climber's belay/rappel device. The added mass and rope contact area helps keep heat-build-up and device temperature to a lower level. This variability also helps when rappelling in muddy caves on mud-cakes ropes. Using fewer bars also helps in this case. One can easily shift the rope to weave the bars back into use if the lower portion of the rope gets washed clean by falling water.
With everything you've done to that poor z2r, I wonder if it could be used for a small vehicle winch?
Maybe pulling the tail of a pulley system
Collaboration of the century!
This was one of the best trips to Ellison's Cave I have been on! Such a fun crew to do cave science with! ❤
It was definitely a blast .
Que chido
Rachel should have taught you better! It’s the deepest in the contiguous United States :)
Woohoo made a first!
Actually, a fantastic trandem was done around 1978.