I'm not sure what to call this one...

Discussion in 'Motorized Trikes' started by SimpleSimon, Jun 7, 2010.


Which name fits better?

  1. A: The Iron Butterfly

  2. B: The Banana Slug

  1. SimpleSimon

    SimpleSimon Active Member

    I got a wild hair this afternoon, and kinda went a bit buggy...but now I don't know what to call the result.

    So, help me choose:

    A: The Iron Butterfly

    B: The Banana Slug

  2. SimpleSimon

    SimpleSimon Active Member

    Hmmm...pic didn't load.

    Attached Files:

  3. srdavo

    srdavo Active Member

    Very nice design!! Iron Butterfly all the way!!
  4. SimpleSimon

    SimpleSimon Active Member

    And again...

    Drawing this thing up yesterday I was just going with the flow of ideas, and took no time to do any load calculations. Turns out that the unsupported base tube leading to the rear assembly pivot point just wasn't gonna cut the mustard, so I did some figuring today, and modified it a bit. With the seat tube brace extended to intersect the bottom rail, and moving the mid-drive mounting point back much closer to the pivot point, it works.

    I also decided it needed some stiffening of the rear triangle as well. The basic lines of the bike remain essentially the same, with short-travel front BMX type shock forks. I'm considering what type of handlebars too give it. Suggestions?

    Attached Files:

  5. professor

    professor Active Member

    I guess I would just call it the Butterfly. Slick design. How will you do all those bends?
    Only weakness I see is the two parallel bars going to the front, will they be bigger than shown?
  6. SimpleSimon

    SimpleSimon Active Member

    Nope. I did the math, and 3/4 inch thick wall tubing is adequate, strength wise. It isn't very clear in the second pic, but there are a couple of diagonal 1/2 cross braces between the tubes as well. Also, the shell of the BB acts as a brace between them.
  7. GearNut

    GearNut Active Member

    I chose Iron Butterfly. Ina-Goda-Davida baby!
  8. wheelbender6

    wheelbender6 Well-Known Member

    Agree. In the garden of eden, baby.