not or vice versa in such a case the trailing edge of the untruncated blade section extends beyond the truncated trailing edge of the truncated blade section the truncation is arranged such that a trailing edge gap will not be formed when the outer blade section is pitched at least for an initial range of pitch angles as seen in fig4 the truncated sections of the blade 18 extend along a portion of the blade trailing edge 38 a short distance from the pitch junction 32 for example the truncated trailing edges extend from the pitch junction 32 a distance substantially equivalent to at least approximately 10 of the length of the blade section in question in a further alternative the truncated trailing edge may extend along the entire length of the trailing edge of the inner blade section 24 as illustrated in fig6 the blade may be provided as a basis blade 48 with a sharp trailing edge 50 and without a truncated trailing edge and a shell member 52 or fairing around one or both of said inner and outer blade sections at said pitch junction the shell member 52 may be shaped to present an aerodynamic profile at the pitch junction with a truncated trailing edge 44 46 the advantage of using such a shell member 52 is that the truncated trailing edge.