Stability Analysis of a Helicopter with an External Slung Load System

Table 1

System poles locations for a fixed slung length ( ft) but with different load weights.

Helicopter	500 lb	1000 lb	1500 lb	2000 lb
−1.0919	−1.1159	−0.7848	−0.6221	−0.9369
−6.3938	−6.4301	−9.2203	−7.9848	−7.5613
−0.0032	−0.0048	−0.0034	−0.0052	−0.0052
−0.0977	−0.0818	−0.0888	−0.0972	−0.0694
−0.3045	−0.3036	−0.3394	−0.3318	−0.3333
−0.3159 ± 0.4363	−0.3199 ± 0.4628	−0.2295 ± 0.5050	−0.2366 ± 0.5974	−0.1834 ± 0.4968
−0.0489 ± 0.3898	−0.0211 ± 0.3868	0.0074 ± 0.3445	0.0119 ± 0.4406	0.0264 ± 0.3199
—	−0.0316 ± 1.5043	−0.1020 ± 1.7380	−0.0368 ± 1.8753	−0.1160 ± 2.0003
—	−0.0736 ± 1.5019	−0.7662 ± 1.1680	−0.7349 ± 1.9064	−1.2367 ± 0.8995