Fuel problems use the exact same mathematical principles as time, speed, and distance. Treat your Fuel Flow (Gallons Per Hour - GPH) as your speed. Exercise 2.1: Total Fuel Burned
First set the pressure altitude (843 ft) in the altitude window and align it with the barometric pressure (29.83). Rotate to bring the air temperature (7°C) opposite the pressure altitude. Read density altitude directly from the window — approximately 1,100 feet.
: Always perform a "sanity check" before trusting the wheel. If you have a headwind, your ground speed must be lower than your airspeed. e6b+flight+computer+exercises+verified
Wind correction errors almost always trace back to improper wind dot placement on the wind side — misaligning the dot relative to the true index or forgetting to rotate the disk after setting wind direction.
The E6B is not a relic; it is a thinking tool. When you practice , you are not just memorizing knob-twisting. You are internalizing the relationships between air, wind, time, and fuel. You will be the pilot who, when the iPad overheats or the GPS fails, calmly reaches for the whiz wheel and gives ATC an accurate ETA within 30 seconds. Fuel problems use the exact same mathematical principles
Use the wind side. Set wind direction (250°) under the true index. Mark wind dot 15 units above the grommet. Rotate to true course (130°) under the true index. Slide the disk so the wind dot aligns with TAS (112 knots). Read groundspeed at the grommet — approximately 108 knots.
These calculations use the "Speed Index"—the large 60 (representing 60 minutes in an hour) on the inner scale. Rotate to bring the air temperature (7°C) opposite
Look at the (the large black triangle labeled "60" on the inner scale).