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Roll-ins

Discussion in 'BMX & Dirt Jumping' started by cmc, Jan 29, 2010.

  1. cmc

    cmc Turbo Monkey

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    jank jank















    can't forget about vert ramp extension roll-ins....



     
    #1 -   Jan 29, 2010
    Last edited: Jan 29, 2010

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  2. TheTruth

    TheTruth Turbo Monkey

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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.
     
  3. Cru Jones

    Cru Jones Turbo Monkey

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    Nice. Good thread. Nasty has a crazy roll-in has trails... can't find a pic though.
     
  4. rockofullr

    rockofullr confused

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    Hows that work?
     
  5. Cru Jones

    Cru Jones Turbo Monkey

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    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.
     
  6. sittingduck

    sittingduck Turbo Monkey

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    There's a spot in Portland that had one built out of pallets. Capital J for janky!
    It worked though....
     
  7. sittingduck

    sittingduck Turbo Monkey

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    Haha! I like how they put a little piece of coping on that.... :rolleyes:
     
  8. cmc

    cmc Turbo Monkey

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    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.

    http://id.mind.net/~zona/mstm/physics/mechanics/forces/inclinedPlane/explanation/inclinedPlaneExplanation.html


    http://www.sparknotes.com/testprep/books/sat2/physics/chapter8section3.rhtml


    rollercoaster simulator:
    http://www.funderstanding.com/coaster
     
    #8 -   Jan 29, 2010
    Last edited: Jan 29, 2010
  9. fletch_tx

    fletch_tx Chimp

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    CMC....you know we'd be stoked to have that for a drop in at HH :weee:
     
  10. TheTruth

    TheTruth Turbo Monkey

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    I don't know but you couldn't see the whole ramp from just standing at the top, it just looked like nothing.
     
  11. escapeartist

    escapeartist Turbo Monkey

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    The one at Rye Airfield is a bit over vert I believe. Scaryfast.
     
  12. yesimaddicted

    yesimaddicted Monkey

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    some of the ones i have made
     
  13. Savage_Animal

    Savage_Animal Monkey

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    The skaters need that to drop in on.
     
  14. sittingduck

    sittingduck Turbo Monkey

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    Ah, good thinking! Makes sense, now that you mention it. :thumb:
     
  15. w00dy

    w00dy In heaven there is no beer

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    Naw. It hardly goes vertical. Over-vert roll in would be scetchy as hell. Rye has nicer ramps than that.
     
  16. cmc

    cmc Turbo Monkey

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    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.
     
  17. sittingduck

    sittingduck Turbo Monkey

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    That would be fun to learn stalls and airs on too.... and no way to get hung up.
     
  18. cmc

    cmc Turbo Monkey

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    exactly.

    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. .

     
  19. ApolloCreed

    ApolloCreed Chimp

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    yeah for the boards to drop in....smartness.
     
  20. v-digit

    v-digit Turbo Monkey

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    what are these boards you speak of? and what is it like to read this already discussed on page one? :weee:
     
  21. Cru Jones

    Cru Jones Turbo Monkey

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    A hill sometimes makes the best roll in...

     
  22. cmc

    cmc Turbo Monkey

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  23. cmc

    cmc Turbo Monkey

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  24. cmc

    cmc Turbo Monkey

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  25. Cru Jones

    Cru Jones Turbo Monkey

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    Just built a new roll-in for our spot... it's amazing how a little ramp can make a huge difference...

     
  26. Greyhound

    Greyhound Trail Rat

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  27. -BB-

    -BB- I broke all the rules, but somehow still became mo

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    This one is sick...
    :eek:
     
  28. TheTruth

    TheTruth Turbo Monkey

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    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. [
     
  29. demo 9

    demo 9 Turbo Monkey

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    like the set, itl never happen :p
     
  30. sealclubber

    sealclubber Monkey

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  31. TheTruth

    TheTruth Turbo Monkey

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    It will! Im making a pump track too
     
  32. demo 9

    demo 9 Turbo Monkey

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    how are you going to do that? you have to go uphill, really up hill
     
  33. eaterofdog

    eaterofdog ass grabber

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    Hmm I'm really jonesing to build something in my yard. A 6-8 foot roll in would really help.
     
  34. bobsten

    bobsten Monkey

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    pretty sweet rollins
     
  35. cmc

    cmc Turbo Monkey

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  36. cmc

    cmc Turbo Monkey

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    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.

     
    #37 -   Jan 19, 2011
    Last edited: Jan 19, 2011
  37. nyhc00

    nyhc00 Monkey

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    I really like this, and may be making something similar in my yard this spring.
     
  38. TheTruth

    TheTruth Turbo Monkey

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    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.
     
  39. demo 9

    demo 9 Turbo Monkey

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    It would need an LSD trip to be possible