| 摘要 |
1521768 Helicopter rotor blades UNITED TECHNOLOGIES CORP 18 Dec 1975 [19 Dec 1974] 51955/75 Heading B7W A helicopter rotor blade capable of withstanding a lightning strike has a conductive leading edge anti-abrasion strip 32, 34, and a light flexible conductive member attached to the top and/or bottom surface of the blade and extending substantially the full span of the blade. The anti-abrasion strip is in two abutting parts, and a good electrical connection between the two parts is provided by an overlapping conductive strip (62), Fig. 4 (not shown), and a wire mesh (64, 66) extending between the strip and each anti-abrasion strip. A connector 72 of aluminium foil extends between the antiabrasion strip 32 and the conductive member. The blade has a support spar 20 which is conductive and is joined to or forms the blade root 12 to electrically ground the blade to the helicopter. The flexible conductive member is an aluminium wire fabric, and its root end,is joined to the spar 20 by means of a wrap (52), Fig. 3 (not shown), of aluminium wire fabric which overlaps the member and the spar. The wrap is forced against these parts by means of a further wrap (54) of waterproof shrink tape. A conductive tip-cap 36 is conductively connected to the spar by means of bolts 38. |
