heater engine must operate at its higher speed range or in other words at full power in no wind conditions the heater is capable at full power of maintaining a coolant temperature in the main engine of 100 u00b0 f 37 8 u00b0 c at ambient temperatures below 45 u00b0 f 42 8 u00b0 c in combined wind and low temperature conditions the heater can maintain the desired 100 u00b0 f 37 8 u00b0 c coolant level down to an approximate wind chill factor in the region of 60 u00b0 examples of conditions corresponding to this chill factor again dry bulb temperatures are ______________________________________ 4 u00b0 f at 50 mph wind or 20 u00b0 c at 80 km hr 15 u00b0 f at 20 mph or 26 u00b0 c at 32 km hr 34 u00b0 f at 10 mph or 37 u00b0 c at 16 km hr ______________________________________ fig4 shows the configuration of the heater system which in its current form as previously described to operate with the specified electromotive gp 40 diesel has a weight of about 475 pounds 215 5 kilograms and is about 20 by 21 inches in its horizontal dimensions and about 39 inches high 50 8 u00d7 52 5 u00d7 99 centimeters indicated in fig4 are some of the elements previously discussed functionally frame 41 is shown supporting small diesel.