<prompt> tafadhali geuza maudhui haya ya swahili kwenda kwa kiingereza.wetu small wind turbines wamekuwa imeundwa kuwa kimya sana, kwa mfano kwa kuwa na mifumo ya moja kwa moja gari ili kuepuka gear box kelele na kuongeza ufanisi.  <response>: the majority of modern small wind turbines have been designed to be very quiet, for instance by having direct drive systems to avoid gear box noise and to increase efficiency. 