Carbon Fiber Fun

Discussion in 'Innovators Workshop' started by Rick Youngblood, Mar 11, 2016.

  1. mzweili

    mzweili Guru

    an intermediate solution would be to pressfit a bushing across.
    Without a bushing, the axle that goes through the aluminum frame has to fit as tight as possible into the hole to reduce the wearing out of the hole.
    And no screw threads where it touches the aluminum hole.
     
  2. Rick Youngblood

    Rick Youngblood CarbonCraft Master

    What I did do was shape and mold a piece of delrin plastic to the inside dimensions and inserted into the frame for support (see photos above). Then drilled through the side walls of the frame and delrin. This should keep the side walls from obloning and spread out the weight of the load, keeping the frame from deforming.

    I agree ideally the sulolution would be to weld a hollow tube that passes through the frame as other recumbents manufacturers do.
     
  3. Rick Youngblood

    Rick Youngblood CarbonCraft Master

    I actually did do this as my first solution, but then changed to the molded delrin plastic solution instead.
     
  4. super slim

    super slim Zen MBB Master

    Rick, as long as you needed Ratz's rubber mallet to force the hard delrin into the frame, then this is a solid solution as it spreads the load into the base as well as the sides.
     
    Rick Youngblood likes this.
  5. Rick Youngblood

    Rick Youngblood CarbonCraft Master

    Disclaimer: No Ratz's Hammer where harmed in the making of this project :D:D:D!
     
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  6. Bentas

    Bentas Well-Known Member

    Carbon fibre build nearing completion
     

    Attached Files:

    Jeremy S likes this.
  7. Charles.Plager

    Charles.Plager Recumbent Quant

    Very. Nice. :D

    Maybe you've already posted this and I've missed it, but what fork are you using and how are you mounting the derailleur?
     
  8. Bentas

    Bentas Well-Known Member

    The fork is made from seat stays from doner Carbon frame, epoxied into cut down doner Carbon fork, then drop outs epoxied to seat stay ends, wrapped all with a few layers of Carbon fibre sanding between applications.
    Sorry about the quality of pics ,the derailier hanger is part of doner Carbon chain stay ,so just bolt on.
     

    Attached Files:

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  9. Charles.Plager

    Charles.Plager Recumbent Quant

    Ahhh... Very cool!
     
  10. Bentas

    Bentas Well-Known Member

    Nearly Spring here in oz , build nearly complete, I set myself a goal to have it ready by September , I'm a bit over building and winter, just want to go ride my bike!
    View attachment 5418 image.jpeg I can't remember where I found this little orange beast but it looks carbon maybe ,way cool me thinks!
    Is it just me or does his riding position look like he could generate some serious power .
    Especially if he carried a smaller lunch box.
     

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    Last edited: Aug 28, 2017
  11. ak-tux

    ak-tux Guru

    Wow! That's a seriously oversized boom! Must be quite rigid with serious power transfer. Are you going to trim and plug the hole at the bottom end of the boom?
     
  12. Bentas

    Bentas Well-Known Member

    Yes , will have my light mounted in there eventually, front end is super stiff, and light ,boom is part of a failed carbon racing oar .
     
    Don1 likes this.
  13. Tigerpaw

    Tigerpaw Well-Known Member

    Some dang fine talent! Looks great.
     
  14. ak-tux

    ak-tux Guru

    Looks great and light. How much does it weight? 9kg? 10kg?
     
  15. Bentas

    Bentas Well-Known Member

    Thanks for the positive feedback,
    If you don't like sanding until your fingers bleed don't build with carbon fibre, been building recumbents for 12 years ,started with steel ,then alu ,now cf,
    This one has been the most challenging ,I have no idea how it will stand up to my 85 kilos, praying that I haven't built a death trap.
    Not going to weigh bike until I finish it, was about 21lbs before rear seat stays were added and extra layers on down tube
    Still have front derailier , rear brake and left shifter to add,
    I'm guessing around 24 lbs is probably realistic, using 105 brifters and no name brake callipers ,the wheels are great everyday hoops but definitely not light as carbon wheels go.
    As for performance, I have not racked up enough klm's ,or fitness to guage if it's faster than my alu mbb
    What i can't stress enough though is the quiet ,plush ride that a carbon recumbent provides
    So much so that my main reason for making the bike out of carbon initially was the weight advantage ,but the real bonus is ride quality .
    This was unexpected, being longer wheelbase than my previous is probably a factor also.
     
    Last edited: Aug 29, 2017
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  16. ak-tux

    ak-tux Guru

    Last edited: Oct 12, 2017
  17. snilard

    snilard Guru of hot glue gun

  18. ak-tux

    ak-tux Guru

    I think he is quite a tall guy and probably didn't want to extend the chainstay length from the donor bike.
     
  19. RojoRacing

    RojoRacing Donut Powered Wise-guy

    That poor BMC :emoji_sob:
     
    ak-tux likes this.
  20. Bentas

    Bentas Well-Known Member

    Very nice, has all the hallmarks of a great climber!
     

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