DMM Dragon Cam Vs 1.3 Ton Boulder
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3:58
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Possibly even BD C3's vs. CAMP tricams
bionicharedie 2 weeks ago
I would like to see similar tests done with other brands of cams. for example: Black Diamond Camalot C3's Vs. Wild Country Helium Friends or Trango Splitter cams.
bionicharedie 2 weeks ago
Does this prove that the cam can pull a boulder out of the wall and onto the climber?
gryphontaboo 4 months ago
@EdMajinLee199999 You're right, the cam is experiencing a force greater than the weight of the boulder while it is accelerating upwards. I was using a simplified static model, as I figured they were simply swapping weight for exerted force.
pigvarley 5 months ago
@pigvarley No, we are talking about peak forces over a time period, so the mass of the boulder is not interchangeable with the force the boulder exerts on the cam.
EdMajinLee199999 5 months ago
@EdMajinLee199999 Weight is a force, it's mass that is not. Per the physics definition, Force = Mass x Acceleration. In SI units 9.81 Newtons (N) = 1 kg x 9.81 m/s^2. For American units this translates to Pounds Force ( weight) = Pounds Mass x Gravity, or 32.2 lbs-f = 1 lbs-m x 32.2 ft/s^2. Since gravity is constant on Earth, Mass and Force are interchangeable, as with 2.2 lbs-f = 1 kg. So with that, 1.3 tons x 2,240 lbs-f/ton x (1kg / 2.2 lbs-f) x 9.81 N/kg x (1 kN / 1000 N) = 12.98 kN.
pigvarley 5 months ago
@pigvarley kN is a measure of force, not weight.
EdMajinLee199999 5 months ago
That explains how they set a boulder on the pallet...
mxhost1 6 months ago
@pigvarley I didn't know that the British ton was more than a kN more than the US ton. Sooo... fair enough. Less inaccurate than I thought. You learn something new every day I suppose.
wburgboy75 8 months ago
@wburgboy75 If they're going by the UK definition of a ton, it's about 2,240 lbs. So this 1.3 Ton rock is probably closer to 13kN, though still not 14kN.
pigvarley 8 months ago