Will the cg remain within limits after 30 gallons of fuel has been used in flight

Discussion in 'Pilot Training' started by zee, Dec 9, 2020.

  1. zee

    zee Filing Flight Plan

    Joined:
    Sep 24, 2020
    Messages:
    16
    Display Name:

    Display name:
    zee
    Hello every one please help me on this question.

    GIVEN: Empty weight (oil is included) 1,271 lb Empty weight moment (in-lb/1,000) 102.04 Pilot and copilot 360 lb Cargo 340 lb Fuel 37 gal Will the CG remain within limits after 30 gallons of fuel has been used in flight?
     
  2. Craig

    Craig Line Up and Wait

    Joined:
    Nov 23, 2015
    Messages:
    783
    Location:
    North Texas
    Display Name:

    Display name:
    Craig
    Depends on where the fuel is located.
     
    Tantalum likes this.
  3. GRG55

    GRG55 Final Approach

    Joined:
    Dec 29, 2015
    Messages:
    9,206
    Display Name:

    Display name:
    Aztec Flyer
    You should know how to do that calculation yourself using the W&B information for the specific airplane.
     
  4. luvflyin

    luvflyin Final Approach PoA Supporter

    Joined:
    May 8, 2015
    Messages:
    9,344
    Location:
    Vancouver, WA
    Display Name:

    Display name:
    Luvflyin
    Probably. Give us the moment of the pilots, cargo and fuel like you did for the empty plane. Better yet, what airplane? Depending on how the cargo is ‘distributed’ you could have started out right on the edge of the ‘envelope.’ If so, burning off 30 gallons could put you out.
     
    Last edited: Dec 15, 2020
  5. Deelee

    Deelee Cleared for Takeoff

    Joined:
    Feb 12, 2019
    Messages:
    1,184
    Display Name:

    Display name:
    Deelee
    Hmmmmm this is very similar to that previous post... Yeah... and what @GRG55 said.

    Are you a student pilot? If so, you should get with your CFI to learn how to do these calculations.
     
  6. zee

    zee Filing Flight Plan

    Joined:
    Sep 24, 2020
    Messages:
    16
    Display Name:

    Display name:
    zee
    Sure sir
     
  7. GMascelli

    GMascelli En-Route

    Joined:
    Jul 27, 2005
    Messages:
    3,258
    Location:
    Ocean City, MD
    Display Name:

    Display name:
    GaryM
    Build yourself an excel spreadsheet and play with every scenario. It's not that hard to do. You could purchase a weight and balance ap to accomplish the same task.

    What @Deelee said, get with your CFI to learn how to do these calculations.
     
  8. Capt. Geoffrey Thorpe

    Capt. Geoffrey Thorpe Touchdown! Greaser! PoA Supporter

    Joined:
    Jun 7, 2008
    Messages:
    13,025
    Location:
    DXO124009
    Display Name:

    Display name:
    Light and Sporty Guy
    Not that hard to do weight and balance.
    Shameless self promotion, don't watch if that bothers you:

     
  9. MauleSkinner

    MauleSkinner Final Approach

    Joined:
    Oct 25, 2005
    Messages:
    8,895
    Location:
    Wichita, KS
    Display Name:

    Display name:
    MauleSkinner
    -3 points for penmanship. (pencilmanship?)
     
    Capt. Geoffrey Thorpe likes this.
  10. kep5niner

    kep5niner Pre-takeoff checklist

    Joined:
    Oct 5, 2018
    Messages:
    188
    Display Name:

    Display name:
    Pete
    [​IMG]



    Good initiative, poor execution. Get with your CFI, or any number of resources linked in your other threads.
     
  11. MauleSkinner

    MauleSkinner Final Approach

    Joined:
    Oct 25, 2005
    Messages:
    8,895
    Location:
    Wichita, KS
    Display Name:

    Display name:
    MauleSkinner
    I once said “ ‘s up to you.” It wasn’t what the guy heard.
     
  12. Tantalum

    Tantalum Final Approach

    Joined:
    Feb 22, 2017
    Messages:
    7,161
    Display Name:

    Display name:
    San_Diego_Pilot
    My mom, an immigrant with broken english, when she was first pulled over in this country the police officer said to her "alright ma'am, I am going to cut you a break" - as in, let her go without a ticket. Well my mom (a) didn't understand the expression 'cut you a break' and (b) coming from a Soviet Bloc country assumed the worst and had a near panic attack that the cop was going to "cut her brakes"

    It's a funny memory in hindsight.
     
  13. unsafervguy

    unsafervguy Pattern Altitude

    Joined:
    Aug 16, 2011
    Messages:
    2,103
    Location:
    Sw florida
    Display Name:

    Display name:
    bob
    i get paid 50/hr to give ground school. I don't do it for free on the internet. if you are a student pilot you need to learn how to W&B. either get a good instructor or enroll in a ground school. please don't ask other to do the work for you.
     
    Groundpounder likes this.
  14. William Pete Hodges

    William Pete Hodges Pre-takeoff checklist

    Joined:
    Mar 6, 2020
    Messages:
    194
    Location:
    Virginia
    Display Name:

    Display name:
    Petehdgs
    There appears to be a fair amount of required information missing. There should be position information for all loads in the airplane as well as the CG limit range. Since this is a question you are presumably working on, perhaps more information is available to you elsewhere?
     
  15. AeroLudite

    AeroLudite Pre-Flight

    Joined:
    May 25, 2020
    Messages:
    65
    Display Name:

    Display name:
    AeroLudite
    At the risk of offense to some sensitive (beachcraft) pilots, some of the early V-tail Bonanzas will shift the cg rewards as the fuel burns off. Enough to take off in cg but be out of cg when landing.
    The older written tests for commercial certificate used to reflect this, with questions directly from the sample w&b from the a/c manual.

    Most of your garden variety Cessna and Pipers shift little if any, by design. Actually comparing my Cherokee 140, going from 50gal to 12gal shifts the cg 0.74” forward. An indiscernible amount.
     
  16. jayhawk74

    jayhawk74 Pre-Flight

    Joined:
    Feb 12, 2018
    Messages:
    61
    Display Name:

    Display name:
    jayhawk74
    The only way to know is to run the W&B problem using the aircraft manual. What I use to tell my students is compute the CG for takeoff then redo the problem with zero fuel. If they were still within the CG envelope then there was no issue. If they were out of CG in the zero fuel condition then I would have them keep doing it until they found the minimum fuel that would keep them within CG. For most conditions if they were within CG for takeoff they were also within CG with no fuel. Bottom line use you aircraft's W&B data and charts and run the problem.