"Bullitt Ride" (yesterdayknight)
12/19/2014 at 10:30 • Filed to: drift, drifting, oversteer, oppo, oppositelock, truckyeah, trucks, dump truck, rally
8
14|
"Bullitt Ride" (yesterdayknight)
12/19/2014 at 10:30 • Filed to: drift, drifting, oversteer, oppo, oppositelock, truckyeah, trucks, dump truck, rally | 8
| 14 |
I saw it coming, it happened so gracefully...dat momentum.
Rainbow
> Bullitt Ride
12/19/2014 at 10:33 |
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"Freddy... Park all the trucks."
Imirrelephant
> Bullitt Ride
12/19/2014 at 10:53 |
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Woah! Talk about a code brown...
Mattbob
> Bullitt Ride
12/19/2014 at 10:56 |
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wow. That is awesome. If that is you in the truck though, you're so calm. I would have been laughing my ass off once he stopped safely. That looks like it could have been pretty scary.
XJDano
> Bullitt Ride
12/19/2014 at 11:04 |
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SHUT IT DOWN!
Manual Transition
> Bullitt Ride
12/19/2014 at 11:31 |
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It turns rather quickly, for a vehicle with that much mass. Not what I expected.
Sir_Stig: and toxic masculinity ruins the party again.
> Bullitt Ride
12/19/2014 at 11:44 |
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davesaddiction @ opposite-lock.com
> Bullitt Ride
12/19/2014 at 11:47 |
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Ho lee crap...
Nibbles
> Sir_Stig: and toxic masculinity ruins the party again.
12/19/2014 at 11:48 |
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Perfection
Chris Clarke
> Sir_Stig: and toxic masculinity ruins the party again.
12/19/2014 at 11:49 |
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beautiful
nermal
> Bullitt Ride
12/19/2014 at 11:57 |
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Shouldn't have lifted...
/whenindoubtapplymorethrottle
Meatcoma
> Bullitt Ride
12/19/2014 at 13:24 |
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Articulating trucks are even more fun when it's slick. So much fun to drive.
Full of the sound of the Gran Fury, signifying nothing.
> Sir_Stig: and toxic masculinity ruins the party again.
12/19/2014 at 13:25 |
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He was doing fine until that wiper went up...
doodon2whls
> Bullitt Ride
12/19/2014 at 13:31 |
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This sounds improbable - that a 400 ton vehicle - could slide around, but there are two interesting phenomenons that cause even these heavy haul trucks (and Military Tactical Wheeled Vehicles) to lose directional stability despite their mass. 1) Frozen ground with a thin skim of thawed soil on top 2) mud-planing.
The first concept isn't hard to grok, right ? Slippery icy ground + slippery soil on top = very low coefficient of friction. That is, as a matter of fact how ice skates work.. The narrow blade imparts such a high pressure (force/area) onto the ice below that it melts the ice and you are actually gliding on a thin skim of water on ice. Nearly zero coefficient of friction. Zoom.
The second concept shouldn't be too hard to understand if you understand hydroplaning. These large Haul Trucks have gigantic tires to reduce their ground pressure significantly such that they do not destroy the roads that they need to traverse repeatedly. In fact, the ground pressure of a fully loaded 400 Ton Haul Truck is estimated to be only 75% of a 75 Ton 5-axle 18 wheeler (!). 107 psi versus 80 psi... Huh.. Who knew ?
[SIDEBAR:You all (should) know that hydro planing occurs when a wedge of water is built up in front of a tire as the water does not have time to escape at higher speeds. Automobile tires intended for driving in the rain (3 or 4 season) have tread patterns that are designed to evacuate water efficiently. When the wedge of water gets large enough it disrupts the mechanical grip that a tire attempts to maintain with the ground surface and the result is a greatly reduced effective coefficient of friction and reduced directional stability - bad news if you aren't expecting it, and/or don't know how to or have time to recover.]
OK then, so back to mud-planing... It is similar to hydroplaning, but in this case, the effective viscosity of the liquid is increased due to the silt suspended in the mud. (We all agree that mud is fine particles of dirt and silt suspended in water, right ? And that is allowed to sit for a long time, the dirt and water would seperate.) Because of the higher effective viscosity of the mud, it doesn't move out of the way very quickly and mud-planing can happen at much lower speeds. You'll also note that to increase tire durability and withstand enormous loads, these huge Haul Truck tires have almost large tread blocks with minimal siping. Tread blocks on tires squirm and generate heat in tire carcasses. Large tires under enormous loads generate lots of heat energy that needs to be dissipated or the tire carcass will delaminate and rapidly disassemble itself... Tread blocks would be a bad idea. OK - do you see where this is going ? Thick viscous mud constantly stirred up by vehicle traffic being run over by vehicles with relatively low ground pressure causes a wedge of mud to build up in front of the tires. Due to the low ground pressure and lack of tread on the tires, the mud disrupts the large tire's mechanical grip on the soil and WOOOO HOOOO DORRRRIFTO in a 400 Ton truck. Actually, it can be quite frightening. Ask any one of the guys or gals that have ridden in an MRAP on muddy roads in Iraq or Afghanistan. Lack of directional stability in a huge vehicle is pretty scary.
More examples of mud planing in this compilation... (turn down the volume - bad music)...
MonkeePuzzle
> Bullitt Ride
12/19/2014 at 14:12 |
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colour of pants, now same as colour of surrounds and truck