2006-12-21 20:44:34 · 10 answers · asked by neo2832 1 in Cars & Transportation ➔ Aircraft
compressed paper
2006-12-21 20:45:27 · answer #1 · answered by SCOTT B 4 · 0⤊ 5⤋
Well, I have been out of the flying game for quite a while, but the Bell 47 D-1 had a wood blade, That was my first helicopter on which I trained. They have progressed through just about every metal since then and now (or at least when I retired in 1991), they were made out of composite carbon fiber usually with a stainless steel leading edge to reduce wear
2006-12-25 05:49:00 · answer #2 · answered by walt554 5 · 0⤊ 0⤋
In the past they were metallic, mainly aluminum, but today they are usually a sandwich of composite materials(carbon fiber, Kevlar, fiberglass) with honeycomb in the middle.
Usually fiberglass because carbon fiber and especially Kevlar are hygroscopic, that means that their mechanical characteristics are damaged by water.
2006-12-22 01:32:52 · answer #3 · answered by sparviero 6 · 0⤊ 1⤋
many are made from titanium the same as jet aircraft engine rotor blades.
2006-12-21 20:49:07 · answer #4 · answered by Charles C 1 · 0⤊ 2⤋
Alloys of Titanium, and some are made from Kevlar I believe.
2006-12-21 20:53:35 · answer #5 · answered by Not Ecky Boy 6 · 0⤊ 2⤋
can b of titanium.but nt pure titanium...it's in alloyed form......composites are also used in makin the helicopter light weight and stealthy....basically composites are more into military helicopters!!!!!!!
2006-12-21 23:11:41 · answer #6 · answered by Rakesh M 1 · 0⤊ 1⤋
High poly carbon fiber
2006-12-21 21:25:44 · answer #7 · answered by Anonymous · 0⤊ 2⤋
Sometimes an alloy, or kevlar/carbon fibre. or wood.
2006-12-21 20:55:55 · answer #8 · answered by champer 7 · 0⤊ 2⤋
Aluminium is also used.
2006-12-21 20:55:09 · answer #9 · answered by Anonymous · 0⤊ 2⤋
look it up
2006-12-25 03:10:02 · answer #10 · answered by Dan 4 · 0⤊ 0⤋