Will it snap under my weight?

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Stab the knife in straight up and down, you're okay. More danger if knife is sideways, but still maybe okay.
Your knife is S35VM and 0.160" SPINE so should hold. Famous video of SurviveKnives CEO pounds his 0.125" spine width knife of 3V steel into tree with hammer, and then ties rope on it with blade vertical in tree. Climbs down steep cliff face for 20 feet, all weight on blade. He did not weigh much, however.
If you do this, first buy wife life ins policy on your life, so she can live happily and tell friends that you were very nice, but a bit under-brained.
 
Since you're working along a river bank: a PFD makes more sense. If you land on a rocky section of shore: it'll protect your ribs from the impact. If you land in the river: it'll keep you from drowning...
 
Ya might want to take a class on basic Newtonian physics, specifically the concepts of motion, inertia, momentum, etc, as well as the concept of mechanical advantage. It will likely answer a lot of your questions.

SPOILER ALERT: No. The knife will pull out of your hand. It's as simple as that. Once you start moving, you won't stop until you bounce off of something bigger than you, whether it be a rock, the bottom of the embankment, a river, the first floor of an abandoned hospital, etc.

In the meantime, if you REALLY weigh 300lb, you really ought to stay a bit further back from the edge of any embankment of more than about 45 degrees from level. For your own safety.
 
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I agree, its one of those threads again...

Generally speaking it depends of the momentum and the force of impact you apply on the knife...
Gradual force as Demko applies in his tests will easily hold 300lb sliding downhill IMO
As others said, the medium of the holding material is important too. You hit soft soil and youll probably keep sliding, if youre able to hit harder material as ice or wood, youll have more of an impact to the blade and possibility of snapping will increase. I hate to elaborate on hypothetical situations with so many variables, im doing it because this thread is going down anyway.
S30V is a good dteel from what Ive use it, I dont think a ful tang knife with S30V will snap in OP scenario even the 300lb mas sliding downhill.
 
i guess you could check if you hammer the knife into the wall about 6 feet high.. then hang from it. 🤷‍♂️
 
likely break free before it broke
if it didn't break free your grip very well might
I really wouldn't worry about the knife breaking, and if it did what was your alternative
Not something I would plan to do or try
and they say there are no stupid ?'s :)
 
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Have you considered staying on hills or enbankments that you can arrest your fall on without resorting to sticking knives into the ground?

If that's not possible, I'd recommend a rope, crampons, maybe an inflatable bubble.
 
Good to know. We have a lot of haunted hospitals up here on glaciers or in the Rockies so when the xenomorphs are trying to chase you off a cliff you can save yourself while welcoming them to there doom.
 
Danke42 said:
Good to know. We have a lot of haunted hospitals up here on glaciers or in the Rockies so when the xenomorphs are trying to chase you off a cliff you can save yourself while welcoming them to there doom.
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Speaking of which, what are the current COVID restrictions for xenomorphs up there ? How many are allowed to meet in the Rockies ? J/k
 
Planterz said:
They did this on "Mythbusters". The problem with real period sails (and not just stage props) is that they have what are called "reef bands", where there is an extra layer or layers of material through which line (rope) is inserted so that the amount slack in the sail can be increased or reduced (known as reefing). Either the knife is dull enough to go through the sail and reduce your speed but not sharp enough to go through the reef band (and the knife will twist out of your hand and you'll fall), or so sharp that it glides through both the sail and reef bands and you don't slow down at all.
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Planterz said:
They did this on "Mythbusters". The problem with real period sails (and not just stage props) is that they have what are called "reef bands", where there is an extra layer or layers of material through which line (rope) is inserted so that the amount slack in the sail can be increased or reduced (known as reefing). Either the knife is dull enough to go through the sail and reduce your speed but not sharp enough to go through the reef band (and the knife will twist out of your hand and you'll fall), or so sharp that it glides through both the sail and reef bands and you don't slow down at all.
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Really interesting, wish I had seen that episode.
 
Yo Mama said:
I slid off a roof before, was cold and the ice is real slick. By the time you start slipping it's to late, you don't have the time or motor movement. Best advise is learn how to roll into a fall, not shoving your hands out which is a first reaction for most people.
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Think this is the most likely actual scenario, sliding gracefully (as previously noted) with a long enough time to get your knife out seems unlikely. Having the knife in hand seems more unlikely.

Make friends with Bigfoot or a bear they might save you, if we are talking about wildly implausible scenarios.
 
I remember reading this in an Indiana Jones spinoff novel when I was a kid. He was exploring a haunted Mayan pyramid or some other lost city in Central America when the floor gave out or tilted, and he stopped his fall by wedging his knife in a crack in the rock, then using his whip to climb back up.

Seems like you may have read this one recently. What was the name of it again?
 
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