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Old 09-22-2004, 11:29 PM   #1 (permalink)
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what caused this hop? (video)

just saw a video of a guys rig, which hopped while on a climb. just trying to figure out what caused the hop. if you watch close, you can see what i think causes the side hop (1.left rear tire contacts rocks, 2. right rear tire continues to push, 3.this causes the front springs to cock slightly, 4. once it hops, cocked springs launch the rig sideways). but what actually causes the front to hop off of the ground?


link to video
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Old 09-22-2004, 11:33 PM   #2 (permalink)
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Wanted to lose his leg and his head
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Old 09-22-2004, 11:35 PM   #3 (permalink)
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yea yea, he put his leg out, his cage sucks, bla bla bla. i just want to know about the hop.
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Old 09-22-2004, 11:39 PM   #4 (permalink)
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i dunno maybe wheelbase...shortwheelbase could have done that. also when he bumped the ledge taht put his driver tire up on that other rock that was high up...and short wheel base and gravity probably did it....this is just some guesses
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Old 09-22-2004, 11:45 PM   #5 (permalink)
 
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weight transfer as the rear tyre grips the front lifts the rest is history/Gravity
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Old 09-23-2004, 12:01 AM   #6 (permalink)
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I looked at that a bunch of times and it looks like a few things went together at the same time.

Lite front end.
Ledge rear wheels were going up was off set.
Slight tire spin left rear wheel which caused the front to slide and started the hop.
To much gas.

Just an arm chair opinion.

Was he OK?
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Old 09-23-2004, 12:03 AM   #7 (permalink)
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so what about the hop, all he had to do is let off the brake and let it roll back. Looks like the was no locker or one not turned on in the rear. The left rear tire should have pulled it up the ledge if it was on (I cant really tell if the left rear was turning or not). As soon as the right rear pivoted around and got traction, it hooked up. Like I said, letting the brake off would have kept it from rolling
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Old 09-23-2004, 04:47 AM   #8 (permalink)
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Quote:
Originally Posted by Eagle-Mark
Was he OK?

yea, the post i saw it in said he was fine.
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Old 09-23-2004, 05:39 AM   #9 (permalink)
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That just looked like one of those bad-luck deals. Not much he could have done but reacted with the clutch faster, which not many of us could have done either.

Short wheelbase = be super careful on that kinda stuff. That is why we wear seatbelts.

Glad he is OK.
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Old 09-23-2004, 08:12 AM   #10 (permalink)
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Hard to tell from that video since we can't see the driver side rear tire turning, but it looks like the pass side rear tire got a good bite(based on tire chirp) which lifted the front and pitched the rig over.

Oh, and great job trying to save the rig with your leg
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Old 09-23-2004, 08:41 AM   #11 (permalink)
 
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Looked to me like when the left rear hit the ledge it cause the drivetrain to load up and the hop happened when it unloaded the torque all at once. Lucky dumbass.
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Old 09-23-2004, 08:48 AM   #12 (permalink)
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I believe it was SOA. Axlewrap?
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Old 09-23-2004, 08:57 AM   #13 (permalink)
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that cage worked awesome!
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Old 09-23-2004, 09:13 AM   #14 (permalink)
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Simple. Poor gearing caused that. it's obvious to me he's prolly around 50 or 60 to one. Way too much speed for that obsticle. Combo:

Light front end + too much speed + short wheelbase = front end up, LR tire hit ledge, with front end in air, light, spun to the left and when it came down, it was off camber and the "bite" on the tires stopped while the momentum of the top of the rig kept going. If he was geared right, and crawled it, could have been avoided.
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Old 09-23-2004, 09:22 AM   #15 (permalink)
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Quote:
Originally Posted by snobrder
Hard to tell from that video since we can't see the driver side rear tire turning, but it looks like the pass side rear tire got a good bite(based on tire chirp) which lifted the front and pitched the rig over.

Oh, and great job trying to save the rig with your leg
agreed....
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Old 09-23-2004, 10:10 AM   #16 (permalink)
 
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Suspension too stiff, even as it stands up on the drivers rear the tire doesn't stuff at all...too much speed ...not aired down...Leg too short...

Last edited by Suprsizit; 09-23-2004 at 10:58 AM.
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Old 09-23-2004, 10:31 AM   #17 (permalink)
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After watching this video I'm glad my rig has doors
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Old 09-23-2004, 10:33 AM   #18 (permalink)
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Good god
All other plans out the window, next thing I'm doing is getting my stock shit outta there and getting a new cage. That woulda kicked my 6'4" ass.
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Old 09-23-2004, 10:40 AM   #19 (permalink)
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Old 09-23-2004, 10:42 AM   #20 (permalink)
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Quote:
Originally Posted by ridefast
that cage worked awesome!
I was thinking the same thing...... WTF......

Was that muffler tubing or what?
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Old 09-23-2004, 10:45 AM   #21 (permalink)
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too short of a wheelbase for the light frontend, the RR grabbed (you can hear it) and over he went. luck he didn't loose his leg. hopefully his next cage will be a bit better too.
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Old 09-23-2004, 10:48 AM   #22 (permalink)
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Baby jesus, what a shitty cage. Looks like its bolted to the top of the firewall. Brilliant. I hope he was really okay.
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Old 09-23-2004, 10:59 AM   #23 (permalink)
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The ledge his rear tires hit was not square with the face of the obstacle.

When he hits it on the driver's side, his passenger rear tire continues to move forward with some slippage/wheel speed, pivoting the rig off chamber to the driver side while his driver's side is stopped (open diff?).
When the (spinning) passenger rear hits the ledge, it suddenly grabs traction (chirp) launching the entire rig (front tires leave the ground), but at that point his rig is a little off chamber.
OK, so there we are: airborne, off chamber, with and high center of gravity suspension.
On landing, weight transfers downhill to the back driver tire, compressing it and the springs, tilting the rig further off chamber.
Then the front tires provide just enough bounce/rebound to kick it back up and over the downhill side.

I think the biggest culpret in that roll was high COG, open diffs, and inexperienced driver.
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Last edited by AlanSou; 09-23-2004 at 11:01 AM.
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Old 09-23-2004, 11:34 AM   #24 (permalink)
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that looked like the poison spyder cage.... i really dont like firewall cages for just tha reason.


can anyone confirm what cage it was?

i agree with loppy crawl fawker crawl. only play with the gas when you want to put on a show
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Old 09-23-2004, 01:07 PM   #25 (permalink)
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Quote:
Originally Posted by Dust Puppy
that looked like the poison spyder cage.... i really dont like firewall cages for just tha reason.
Edit: It's the ORFab cage and failed where ORF were laser cut into the firewall support area. PSC no longer cuts their spiders into their cages for this reason.

If you can stand to click the link, here's the origin on JayYew

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