Abstract
A description is presented of a hybrid heavy 1 ift system aerodynamic performance model which is employed in a timber harvesting econometric simulation developed for the USDA Forest Service. The model is capable of treating both multi-rotor hybrid systems, and single and tandem rotor helicopters, with positive and negative buoyancy. The model computes vehicle size, aerodynamic characteristics, basic performance capability, and time and fuel required to perform a timber yarding cycle. Comparison of predicted performance is made with H-34 and S-64 helicopter flight data and with S-64 yarding cycle field operation; the effects of winds and vehicle drag on yarding performance are shown.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
