Weightless Line Method
When a haulback is not necessary, HM = HS2 – HS1
Vertical mainline force
VM = HM(tan a)
Payload W = VM / (sin a)
Mainline M
Payload W
a
b
c
Skyline S1
Skyline S2
a
a
b
VS1
VS2
VM
HS1
HM
HS2
TS1
TM
TS2