In an attempt to reduce fuel consumption and operation costs, especially during cold weather, the two drive axles of a logging truck were insulated to raise the temperatures of the lubricating oils. Thus the oil viscosity and consequently the energy losses owing to oils churning would be reduced. The temperature of the oil in the forward rear axle was recorded continuously for a 240 KM round trip of a logging truck. Insulation details have also been described.
The USDA Forest Service’s Qualified Product List (QPL) provides guidance on the range of permissible mix ratios for water-enhancer products. Due to the proprietary nature of water-enhancer products, there are several unknowns about the rheology of the permissible mix ratios.
This study focused on mapping the viscosity of various suppressant products as a function of their mix ratios. The results revealed a wide range of viscosities across products, with each product showing a different non-linear relationship with different mix ratios.
The results from this study can help understand the optimum viscosity range to achieve desired drop characteristics during aerial operations.