I have an idea (The L-Package)

Discussion in 'Downhill & Freeride' started by Broken_Spoke, Dec 26, 2007.

  1. Broken_Spoke

    Broken_Spoke Mr. Big Hot Pastrami

    Rep/Likes:
    3 / 0
    Joined:
    Feb 26, 2003
    Messages:
    2,410
    Location:
    Bozeman, MT
    I was just looking over the G-Boxx thread when an idea hit me. A liquid drive system, the L-Package (I want to have something other than boxx at the end). So here is how I see it happening. Around the bottom bracket area have a sealed compartment(Main Drive Casing(MDC)) that houses the drive liquid (most likely some type of oil due to it being lighter weight than water and having a higher vaporization point than water) and an impeller with variable pitch on the blades to control the speed of the liquid. The MDC will have two hoses attached to it, one for fluid coming in and the other for fluid going out. These two hoses will be attached to the rear hub which has an impeller inside it that has fixed blades. The pitch on the MDC impeller will be controlled by an electronic 'shifter', which would probably be a potentiometer. As for batteries I think it would be easiest to have them attached on the frame in the same sort of style as the water bottle batteries for some light systems.
     

    Please register to disable this ad.

  2. gonefirefightin

    gonefirefightin free wieners

    Rep/Likes:
    26 / 97
    Joined:
    Feb 5, 2007
    Messages:
    6,688
    Location:
    Surrounded by Police in a hail of gunfire
    I take it you didnt get those mushrooms from a store
     
  3. Broken_Spoke

    Broken_Spoke Mr. Big Hot Pastrami

    Rep/Likes:
    3 / 0
    Joined:
    Feb 26, 2003
    Messages:
    2,410
    Location:
    Bozeman, MT
    Just you wait the L-Package will will be the sauce (calling Nicolai as we speak, please two years of high school German help me now)
     
  4. BmxConvert

    BmxConvert Monkey

    Rep/Likes:
    4 / 0
    Joined:
    Aug 6, 2007
    Messages:
    717
    Location:
    Longview, Washington
    There was a guy something like 2 years back working on having a hydraulic drivetrain. I don't recall which board it was on, perhaps PinkBike. I believe he had a prototype made, which looked like a big Poly chainguard about and inch wide and big enough to cover a 40t+ sprocket.
    Not sure what he had planned for shifting.

    -Kevin
     
  5. RMboy

    RMboy Monkey

    Rep/Likes:
    0 / 0
    Joined:
    Dec 1, 2006
    Messages:
    879
    Location:
    England the Great...
    lol i like the idea, but have no idea how it will work or what it will look like..lol
     
  6. frznnomad

    frznnomad Turbo Monkey

    Rep/Likes:
    5 / 0
    Joined:
    Jun 20, 2005
    Messages:
    2,229
    Location:
    a-town biatches
    you know with a little bit of imagination its not that far of a stretch for me to see it working. now the way im thinking is making it work like an automatic transmision for your car. make it shift by changing the preassure inside the cassing and making something like clutch packs to shift and hold it into gear. now as far as allowing us to shift it withough it doing it itself we could just install stops like they do in AT's to where you can acctually shift it threw the gears. i mean its a far stretch but it could work.
     
  7. Sir_Crackien

    Sir_Crackien Turbo Monkey

    Rep/Likes:
    4 / 0
    Joined:
    Feb 7, 2004
    Messages:
    2,052
    Location:
    alex. va. usa.
    the problem with your idea is that impellers don't work at the low rpm's of the human cadence. the idea has been brought up in many college competitions and a good solution has never been found. all the solutions were at least 10 times less efficient than the cog chain combo we currently use.
     
  8. mandown

    mandown Poopdeck Repost

    Rep/Likes:
    265 / 901
    Joined:
    Jun 1, 2004
    Messages:
    13,340
    Location:
    Transylvania 90210
    invent any drivetrain you want, it still won't give you skills to be as fast as sam.
     
  9. Inclag

    Inclag Turbo Monkey

    Rep/Likes:
    8 / 30
    Joined:
    Sep 9, 2001
    Messages:
    2,303
    Location:
    MA
    Efficiency.
     
  10. MobileChernobyl

    Rep/Likes:
    2 / 0
    Joined:
    Apr 16, 2006
    Messages:
    394
    Location:
    Golden, CO
    Yea the main problems are efficiency - Partly the reason why we still use chain and deraillure, it's so damn efficient.

    Also To get around efficiency issues, groups at schools like polytec have integrated hydraulic accumulators. Basically a capacitor - it stores up hydraulic fluid in some kinda pressue resevoir (fluid/diaphragm/air pressure perhaps) and you can release it for a "boost" when you need it most a.k.a. hill's.

    I think the purely mechanical method will reign supperior until humans stop powering the bikes.

    You could do something similar to a steam engine design - with fluid however, and have the piston's actuation rod points vary in distance from the vertex of the primary drive to create a "variable transmition." This would also get around the impeller's high differential speed. but would create a dead spot at 0* and 180* that would need to be addressed biometrically.
     
  11. Inclag

    Inclag Turbo Monkey

    Rep/Likes:
    8 / 30
    Joined:
    Sep 9, 2001
    Messages:
    2,303
    Location:
    MA
    :eek: