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Discussion in 'BMX & Dirt Jumping' started by cmc, Jan 29, 2010.
can't forget about vert ramp extension roll-ins....
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I have been on top of a roll in that went over vert. It took me a half hour to drop in on it.
Nice. Good thread. Nasty has a crazy roll-in has trails... can't find a pic though.
Hows that work?
That thing actually looks pro compared to some I've seen. I'll have to get a pic of a local one that's janky as hell.
There's a spot in Portland that had one built out of pallets. Capital J for janky!
It worked though....
Haha! I like how they put a little piece of coping on that....
i wish i could say i remember how to do this stuff:
ap = agsin(theta) This formula calculates the acceleration of the object as it slides down the incline. In situations without friction it would be the actual acceleration of the object. In situations considering friction, the acceleration of the object would be less than this value.
CMC....you know we'd be stoked to have that for a drop in at HH
I don't know but you couldn't see the whole ramp from just standing at the top, it just looked like nothing.
The one at Rye Airfield is a bit over vert I believe. Scaryfast.
some of the ones i have made
The skaters need that to drop in on.
Ah, good thinking! Makes sense, now that you mention it.
Naw. It hardly goes vertical. Over-vert roll in would be scetchy as hell. Rye has nicer ramps than that.
i'd be more stoked with this !
if HH aint up for it, i guess i'll have to buy a house with a big yard and no neighbors.
That would be fun to learn stalls and airs on too.... and no way to get hung up.
something about 70's skateparks with the lack of coping and lack of edge (rolled-over lips) seems to work for bikes better, except for grinds of course. .
yeah for the boards to drop in....smartness.
what are these boards you speak of? and what is it like to read this already discussed on page one?
A hill sometimes makes the best roll in...
A pretty cool backyard
Backyard fun SBC style
Bob Burnquist helmet cam 360, Mega Ramp
NASCAR rollercoaster (cam). imagine this as trails....
Just built a new roll-in for our spot... it's amazing how a little ramp can make a huge difference...
This one is sick...
I need to make a roll in at my trails this spring. I am planning on making an ultra excellent set and there is not much excellence to get speed for it. [
like the set, itl never happen
dude lives like 15 minutes from me and i still havent ridden his stuff yet
It will! Im making a pump track too
how are you going to do that? you have to go uphill, really up hill
Hmm I'm really jonesing to build something in my yard. A 6-8 foot roll in would really help.
pretty sweet rollins
Not quite a roll-in, but same purpose: A platform-drop-to-landing. In the clip, dude says the first gap is 32 feet.
Makes me wonder exactly how tall (and what angle/transition) a regular roll-in (where you start at a standstill with no runup) would have to be to clear 32 feet on your first double..... Any physics/math nerdz in the house??
If you're rolling in to immediately hit a normal sized jump (4' tall X 10'-12' long) you may want to try something taller than 6 or 8. Go for 10 or 12 !
I'm saying this because my friends just build an 8' tall roll in and it didn't quite work the way they planned. They had to extend the platform for some run-up and put in a roller before the jump.
Also, Ramp Ranch bikepark (R.I.P.) had a roll-in for a box jump (you can see it on the right, in the back) that I think was 10' or 12' tall. That worked really well.
I really like this, and may be making something similar in my yard this spring.
duh, ill just go downhill. How sick would it be if the pump track went down that humongous hill into the gully and then you could pump your way back out.
It would need an LSD trip to be possible