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Recent content by bd103dall

  1. bd103dall

    Human-powered impellar pump question

    Artisi, Those are some great questions your asking, and sadly I don't have any exact answers for you. We are currently working in conjunction with another group associated with the University of Malawi and are waiting on a response to a whole list of questions (several of which were similar to...
  2. bd103dall

    Human-powered impellar pump question

    Artisi, I am still with you, feel free to ask me any questions you like.
  3. bd103dall

    Human-powered impellar pump question

    Thank you everyone for your great input, there is a lot of information to look into, but I'll post again soon with further ideas and progress. I really appreciate the helpful suggestions.
  4. bd103dall

    Human-powered impellar pump question

    I am part of a humanitarian group which is designing an irrigation pump for farmers in Malawi. The pump itself is powered by an individual pedaling a bicycle, where an additional chain is connected from the rear bicycle gears to a gear around a shaft (a few feet behind the pump). The shaft...
  5. bd103dall

    Under Water Fiber Optic Cable

    Will do, thanks!
  6. bd103dall

    Under Water Fiber Optic Cable

    I am having difficulty finding a fiber optic cable for a test which has the following requirements: - Works to a depth of 250 feet - Has a tension test strength of 20lb or more - Singe-mode, single-strand - 1.5 mm Diameter or less - 5-10 km length If anyone knows any distributors or...
  7. bd103dall

    Small, Unmanned Buoyancy Control Device

    I need a small buoyancy control device which can fit into a 4 inch diameter cylinder. Once dropping the cylinder into the ocean, it needs to achieve nuetral buoyancy at a depth between 50-250 feet, stay there for some period of time (anything over a few minutes would work) and then come back to...
  8. bd103dall

    Glueing HDPE tubes together

    I have a 6" diameter HDPE tube, which needs to be shortend, via cutting out a section of it, then reattached back together. The tube is the middle portion of a large spool. I know HDPE is a difficult plastic to glue, and I am only able to find one adhesive that claims works on HDPE, called...
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