Performance and Vibration Analyses of Lift-Offset Helicopters

Table 2

Blade cross-sectional beam properties.

Radial station	Bending stiffness [lb-ft^2]		Torsion stiffness [lb-ft^2]	Section mass [slug/ft]	Mass moment of inertia [slug-ft]
0.0000	5972000	5972200	4784700	3.6178	0.0453
0.0920	5972000	5972200	4784700	3.6178	0.0453
0.0921	5972000	5972200	4784700	0.8205	0.0453
0.1150	4220000	4375000	4210000	0.6713	0.0453
0.1151	4220000	4375000	4210000	0.6713	0.0381
0.1390	3540000	3860000	3500000	0.6120	0.0381
0.1391	3540000	3860000	3500000	0.6120	0.0321
0.1620	2880000	3400000	2860000	0.5520	0.0321
0.1621	2880000	3400000	2860000	0.5520	0.0365
0.2300	1670000	2740000	1528000	0.4380	0.0350
0.3000	1080000	2230000	1040000	0.3432	0.0291
0.4000	680000	1770000	540000	0.2532	0.0202
0.5000	410000	1500000	260000	0.2016	0.0161
0.6000	240000	1250000	110000	0.1488	0.0117
0.7000	150000	980000	60000	0.1152	0.0096
0.7370	140000	880000	50000	0.1044	0.0090
0.7371	140000	880000	50000	0.1566	0.0090
0.8000	110000	730000	40000	0.1452	0.0077
0.9000	90000	500000	22000	0.1268	0.0055
0.9390	80000	460000	21000	0.1194	0.0047
0.9391	80000	460000	21000	0.3804	0.0047
0.9730	70000	420000	20900	0.3804	0.0042
0.9731	70000	420000	20900	0.4625	0.0042
1.0000	55600	388900	20800	0.4625	0.0042