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Type: Posts; User: Black Alloy

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  1. I've been building carbon fiber chairs for years...

    I've been building carbon fiber chairs for years and using my current one for more than 6. Nothing else compares to a properly designed and built CFRP wheelchair. There isn't much advantage in...
  2. Just marked 5 years of continuous service on the...

    Just marked 5 years of continuous service on the prototype 1 carbon fiber wheelchair. Several sets of tires and casters; and other than swapping several accessory components for testing, zero...
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    The frame is ~25%, the casters/forks are ~25%,...

    The frame is ~25%, the casters/forks are ~25%, the rest is the seatpan, backrest, footrest assembly, calf strap, and fasteners. Main benefits are frame rigidity, higher strength for the weight, much...
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    Here are some of the CAD models used in the...

    Here are some of the CAD models used in the design of this chair.
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    Another custom carbon fiber wheelchair

    This chair shares the same basic frame design as ones I've posted in the past and uses a unique single piece, angle adjustable composite backrest. This chair is a 16Wx16L. 1.5" fixed CG, 2" seat...
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    Oddity is exactly right, there is very little...

    Oddity is exactly right, there is very little advantage realized with respect to ease of pushing a lighter CFRP wheelchair. There can be; however, quite a noticeable improvement in push efficiency...
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    daveh0, My comments in your referenced post...

    daveh0,

    My comments in your referenced post are more true today than the day they were made. It's not a question of materials choice, it's a question of engineering choices. The carbon fiber...
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    cybermex, Sorry, but these handrim sets have...

    cybermex,

    Sorry, but these handrim sets have all been sold. You can send me your contact information via private message if you would like to be notified of future availability.

    Thanks
  9. One more thing, in order to press the new...

    One more thing, in order to press the new bearings into place using a bolt instead of properly sized dies that will apply the force to the outer races, the old bearings may be used. If the caster...
  10. Removing the caster housing bearings can be a bit...

    Removing the caster housing bearings can be a bit of a challenge, but several things may help. First, clean the inside of the housing to remove any dirt, debris that may have accumulated. Second,...
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    Yeah, using the flex in those CFRP seat base...

    Yeah, using the flex in those CFRP seat base strips as suspension is better described as exploiting an under engineered cushion support. Using a low modulus resin and fiberglass reinforcing fibers...
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    Something different in a solid backrest

    It's longer than anticipated to get this designed/built, but the single component composite backrest seems to be worth the effort. Fixed height with adjustable angle. Stable, comfortable and pretty...
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    2 pairs for Spinergy wheels and 1 pair for Sun...

    2 pairs for Spinergy wheels and 1 pair for Sun still available.

    $450/pair shipped to US.
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    Jeff, The situation you describe here is...

    Jeff,

    The situation you describe here is exactly why I abandoned development of composite wheelchairs and accessories. The other industries I do composite design/process consulting in produce...
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    They are finished with DuPont urethane. Provides...

    They are finished with DuPont urethane. Provides good grip, durability and is easily repairable should the handrim become excessively scratched.
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    Carbon Fiber Handrims

    The last few pairs of carbon handrims are available. All are for 25" (559) wheels. One pair for Sun wire wheels and 2 pairs for Spinergy. The only difference is the rim diameter at the mounting...
  17. Carbon Fiber Handrims available for a limited time

    Several sets of carbon fiber handrims are now available thru Ebay. These items are not going to be produced on a continuing basis, but several completed and in-process sets will be listed for sale...
  18. A magnesium cantilever can certainly be made...

    A magnesium cantilever can certainly be made lighter than my composite chair, but a cast iron chair can be built lighter too. Not without compromises that I was unwilling to make.

    I've stated...
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    Lynne, Here's something easy to try. If your...

    Lynne,

    Here's something easy to try. If your caster wheels use small spacers between the caster wheel bearing and the caster fork, clean the ends of these spacers (where they contact the bearing...
  20. The pick up weight is 10lb 8oz. Wheels and...

    The pick up weight is 10lb 8oz. Wheels and cushion not included. It really is remarkable how much difference a few pounds can make.
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    "Standards can be good, don't get me wrong. But,...

    "Standards can be good, don't get me wrong. But, Minimum standards yield minimum compliance, often, and the point of it all is more to manage liability than to make sure we get chairs best built and...
  22. I've never had any first hand experience with the...

    I've never had any first hand experience with the Panthera, but would very much like to. It's a very elegant design that is almost certainly lighter than mine. Shame that carbon frames can't really...
  23. The frame, backrest shell, seat cushion base and...

    The frame, backrest shell, seat cushion base and footplate are carbon fiber composite. The backrest frame and footrest tubes are aluminum.
  24. Car Transfer using Carbon Fiber Wheelchair

    Here's a short car transfer video using a carbon fiber rigid frame wheelchair. Low weight and minimal accessories make the dozen or times a day I do this much easier than with any other wheelchair...
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    SCI_OTR, Wheelchairs for everyday use were not...

    SCI_OTR,

    Wheelchairs for everyday use were not actually something that we are currently planning to offer. The discussion managed to veer off topic, but I think it was neccessary to provide some...
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