Register

If this is your first visit, please click the Sign Up now button to begin the process of creating your account so you can begin posting on our forums! The Sign Up process will only take up about a minute of two of your time.

Results 1 to 12 of 12

  1. #1

    Join Date
    Oct 2009
    Location
    Sandnes, NORWAY
    Posts
    22
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    3 tanks in series?

    In what order do I connect 3 tanks? Both my Viper and F-16 have two tanks on cg and one in front. The manuals for both models shows that its tanks on cg is drained first before the tank in front. Balance the model cg with a half full front tank is ok as long as you know when the level is reached and land with perfect cg. Would it not been better to balance the model with empty front tank and drain front tank first so remaining 2/3 of the trip flown with perfect cg? If you want to land earlier it's only the first minutes model is front heavy.

    Rossi
    Is using google translate :-)

  2. #2

    Join Date
    Aug 2008
    Location
    Calgary, AB, CANADA
    Posts
    180
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: 3 tanks in series?

    Yes your idea is correct.

    Both ways will work but I would drain the tank that is ahead of the CG first.

  3. #3

    Join Date
    Jan 2002
    Location
    Loveland, OH
    Posts
    1,168
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: 3 tanks in series?

    The typical setup is to run the main tanks in parallel and then run a single line to the front tank (in front of the C.G.), then a line out of this tank to the UAT. I have run this configuration in many different types of air frames and never noticed any issues with C.G.
    Gary Jefferson
    Jetcat USA

  4. #4

    Join Date
    Apr 2002
    Location
    Nashville, TN
    Posts
    1,262
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: 3 tanks in series?


    ORIGINAL: Gary Jefferson

    The typical setup is to run the main tanks in parallel and then run a single line to the front tank (in front of the C.G.), then a line out of this tank to the UAT. I have run this configuration in many different types of air frames and never noticed any issues with C.G.
    I ran the same tank configuration on a 1/6 scale F-16 with no issues

  5. #5

    Join Date
    Dec 2009
    Location
    Central Midwest
    Posts
    1,251
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: 3 tanks in series?

    I usually run my two rear tanks in parrellel, front tank empties last. This is to ensure the CG dont shift too far back. On my setup I barely ever touch the front tank as I only fly 6 mins then land.

    3 tanks in series is a lot of pressure during fueling and make sure you use the largest fuel line you can.

  6. #6

    Join Date
    Jan 2002
    Location
    Loveland, OH
    Posts
    1,168
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: 3 tanks in series?

    Using 3 tanks in series really doesn't make much sense because you then have one main tank empty on one side of the plane. I know the tanks are close to the C.G. but I am not sure that is a good idea.
    Gary Jefferson
    Jetcat USA

  7. #7

    Join Date
    Feb 2013
    Location
    , , UNITED KINGDOM
    Posts
    29
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: 3 tanks in series?


    ORIGINAL: Gary Jefferson

    Using 3 tanks in series really doesn't make much sense because you then have one main tank empty on one side of the plane. I know the tanks are close to the C.G. but I am not sure that is a good idea.
    Doesnt matter at all. Lateral balance of a plane makes very little difference. The bites in the fuz are so close to the centre line it will make no difference


  8. #8
    highhorse's Avatar
    Join Date
    Nov 2006
    Location
    Memphis, TN
    Posts
    2,157
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: 3 tanks in series?

    3 in series seems a lot. Perhaps the best solution is a combination of the two solutions: to drain front first and then remaining two in parallel?
    RCU Rocks, I\'\'d hate to be without it !!

  9. #9

    Join Date
    Oct 2009
    Location
    Sandnes, NORWAY
    Posts
    22
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: 3 tanks in series?


    What if I balance the model with empty front tank and parallel connecting tanks in cg?


    Front tank.



    Tanks on CG



  10. #10
    Gary Arthur's Avatar
    Join Date
    Jan 2002
    Location
    Hamilton, ON, CANADA
    Posts
    1,394
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: 3 tanks in series?

    The typical way is to have the main tank supply the UAT and the two saddle tanks supply the main tank either in series or paralell.

    Balance the plane with tanks empty and UAT full. The idea is that you will drain the saddle tanks first and therefore no change in CG. Then as you empty the main tank you will get a shift in CG. Since you will rarely empty the main tank (usually land with some fuel in main tank) the CG shift will be slight. If you find that you are flying and usually have a forward CG due to residual fuel, you can move the CG back a little. Just be cautious because the one time you do run the main tank down low, you will have an aft CG.

  11. #11

    Join Date
    Feb 2013
    Location
    , , UNITED KINGDOM
    Posts
    29
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: 3 tanks in series?

    You are worrying about this too much

  12. #12

    Join Date
    Aug 2008
    Location
    Calgary, AB, CANADA
    Posts
    180
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: 3 tanks in series?


    ORIGINAL: JimJones1

    You are worrying about this too much
    Yuuuuuuuuup


Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
All times are GMT -6. The time now is 05:28 AM.

SEO by vBSEO 3.6.1 ©2011, Crawlability, Inc.