Abstract: A harvesting vehicle includes a header having a cutter bar, a crop transport draper and a reel mounted above the cutter bar to sweep the crop to the draper. The operation of the header is autonomously monitored and controlled to reduce operator loads or to run autonomously by detecting: reel wrapping; differential rates of flow of crop on the header at different locations; where the crop to be cut is at least partly lodged so that stems of the crop are not vertical; the presence of a crop streak of uncut or poorly cut crop behind the cutter bar and/or a band of disturbed soil behind the cutter bar. The detector is arranged to control ground speed, header height, reel height and operation.

Abstract: A gas turbine engine system having improved thermal efficiency, which comprises: (1) an inlet air stream; and (2) a dry low emissions combustor assembly having an air inlet for receiving the inlet air stream, at least one bleed air port and an air outlet for discharging at least a portion of the received air from the inlet air stream. This system includes a source of warmer air capable of raising the ambient temperature of the inlet air stream received by the air inlet of the dry low emissions combustor assembly while operating at a partial load until the system reaches a new equilibrium state having improved thermal efficiency. Also disclosed is a method for improving the thermal efficiency of the dry low emissions combustor assembly, which comprises the step of including a source of warmer air with the inlet air stream received by the air inlet of the dry low emissions combustor assembly while operating at a partial load until the system reaches a new equilibrium state having improved thermal efficiency.