| 摘要 |
A blade 14 for an underwater turbine (1, fig 1) has an inner void defined between top and bottom skins 26,28 and between leading and trailing edges 22,24. A hollow spar 20 extends from a root 16 to a tip 18 of the blade. A foam material partially fills the inner void. The foam material is formed into a plurality of ribs 36 which extend across the blade void and which are separated by gaps 37.
|
