| 摘要 |
1484179 Helicopter rotor blades SOC NATIONALE INDUSTRIELLE AEROSPATIALE 26 Nov 1974 [30 Nov 1973] 51213/74 Heading B7W A helicopter rotor blade comprises, throughout its spanwise extent, a leading edge member 5 and a trailing edge member 6, both formed from bonded spanwise extending filaments, separated by a honeycomb or foamed polyurethane core 7 enclosed by a laminated fabric skin 8. The member 5 has chordwise portions 5b and 5c extending from a leading portion 5a and adjacent the root end of the blade these portions are separated to form portions 9 and 11 and 10a and 12a of a loop surrounding a pivot 14. The trailing edge member 6 is similarly separated to form other portions 10b and 12b of the loop, the portions 10a, 10b, being integral with portion 9 with portions 12a, 12b being integral with portion 11. The pivot 14 is bushed at 15 and is integral with a tapered metal fitting 13 formed by horizontal and vertical webs 16, 18, the cavities between the loop portions and the skin 8, and the fitting 13 being filled with a filler 21 capable of resisting compression and shear. Sheets of synthetic resin impregnated glass fabric 20 separate the loops from the metal fitting 13. The web 16 is formed with an arm 22 having a pivot 4 which may be connected to the rotor hub to prevent lag-lead movements, or connected to a lag-lead damper. |
