Welcome Guest. Sign in or Signup

3 Answers

What happens to the CG of the airplane as the fuel burned?

Asked by: 6201 views Aerodynamics

Is the CG moved forward or aft?

Ace Any FAA Written Test!
Actual FAA Questions / Free Lifetime Updates
The best explanations in the business
Fast, efficient study.
Pass Your Checkride With Confidence!
FAA Practical Test prep that reflects actual checkrides.
Any checkride: Airplane, Helicopter, Glider, etc.
Written and maintained by actual pilot examiners and master CFIs.
The World's Most Trusted eLogbook
Be Organized, Current, Professional, and Safe.
Highly customizable - for student pilots through pros.
Free Transition Service for users of other eLogs.
Our sincere thanks to pilots such as yourself who support AskACFI while helping themselves by using the awesome PC, Mac, iPhone/iPad, and Android aviation apps of our sponsors.

3 Answers

  1. Brian on Aug 25, 2012

    Depends on the location of the fuel tanks. Typically they are located in the wings and very near the CG, so shifts are minimal. But in the case of a aft belly tank there can be quite a bit of forward shift in the CG as fuel is burned.

    Either way, see your aircraft’s W&B section within the POH to know for certain.

    +3 Votes Thumb up 3 Votes Thumb down 0 Votes

  2. JB on Aug 25, 2012

    In most swept wing jets it moves forward.

    An aft CG provides greater range which is why some aircraft have fuel tanks in the horizontal stabilizer. Fuel is pumped back to the tail tanks to move the CG aft for that reason. Additionally, the computers will continue to keep the aft CG by moving fuel to the tail tanks as the flight progresses (i.e. CG moves FWD during flight) until a point is reached that the tail fuel is either burned or must be moved forward for landing.

    +1 Votes Thumb up 1 Votes Thumb down 0 Votes

  3. Steve Pomroy on Aug 28, 2012

    Hi Ami.

    The CG will always move away from the fuel tank in use. The further the tank is from the CG, the faster the CG will move (for a given fuel flow rate). As noted by JB, larger, more complicated aircraft (especially swept-wing aircraft) have the ability to pump fuel between tanks in order to compensate for the CG movement.


    +1 Votes Thumb up 1 Votes Thumb down 0 Votes

The following terms have been auto-detected the question above and any answers or discussion provided. Click on a term to see its definition from the Dauntless Aviation JargonBuster Glossary.

Answer Question

Our sincere thanks to all who contribute constructively to this forum in answering flight training questions. If you are a flight instructor or represent a flight school / FBO offering flight instruction, you are welcome to include links to your site and related contact information as it pertains to offering local flight instruction in a specific geographic area. Additionally, direct links to FAA and related official government sources of information are welcome. However we thank you for your understanding that links to other sites or text that may be construed as explicit or implicit advertising of other business, sites, or goods/services are not permitted even if such links nominally are relevant to the question asked.