Furling tail question

Discussion in 'General Questions' started by jasincole, Jan 14, 2011.

  1. jasincole

    jasincole WindyNation Engineer

    I have studied the furling tail design and have a good understanding of how it works. Now my questions are directly aimed at real world experiences with design and usage.

    As offset increases the higher the potential for the rotor to furl at lower speeds, at the same time added weight on the tail will be needed to offset the furling. Has anyone discovered a relationship to what seems to work best in real world turbines? I had read that one should use a 5 - 10% offset of the total diameter of the rotor blades. Just makes me wonder if a heavier tail with a greater offset would smooth out the action of the furling?

    I know tomt stated that 'size matters', but size doesn't always have a 1:1 correlation to weight depending on the material used.
  2. windyguru

    windyguru WindyNation Expert

    Well, there is only on way to find out. Build it and test it.

    I can tell you that the furling on our tail is smooth and our offset is about 2.25 inches.

    For more information on furling, the backshed has a good article:


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