S-1 Flop Tube Length

Discussion in 'Pitts' started by Z32MadMan, Apr 7, 2018.

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  1. Apr 7, 2018 #1

    Z32MadMan

    Z32MadMan

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    I searched the forum and could not find a definite answer. Multiple threads bring up the topic, but they all beat around the bush (so to speak) and I see different lengths suggested.

    Anyone know the length flop tube to order from Aircraft Spruce? It's an S-1 with the standard 19 gal tank.

    Also, can the flop tube be replaced without removing the fuel tank?

    Trying to get things in order for the annual next month.

    Cheers
     
  2. Apr 7, 2018 #2

    Dennis Flamini

    Dennis Flamini

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    Try this, but be ready to strip the threads in the tank.
    There is a cover screwed to the firewall...let us know how it goes.

    floptube.png
     
    Last edited: Apr 7, 2018
  3. Apr 7, 2018 #3

    Bond007

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    15 inch
    Danny 007
     
  4. Apr 7, 2018 #4

    Z32MadMan

    Z32MadMan

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    Dennis, are you referring to stripping out the bung that the flop tube screws into or the actual tank?

    Any techniques to minimize stripping? Or is it just a craps shoot everytime we have to change a tube?
     
  5. Apr 7, 2018 #5

    Skippy

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    It can be replaced without removing tank just hard to get to.
     
  6. Apr 15, 2018 #6

    Redtail

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    According to the drawing above from Dennis the total length from end to end is 16 inches.
     
  7. Apr 15, 2018 #7

    cwilliamrose

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    Minus the thread engagement.........
     
  8. Apr 15, 2018 #8

    Bond007

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    05-20515
    Spruce
    The last 15 stands for 15 inch
    I've probably installed about 3 dozen of them
    Danny 007
     
  9. Apr 15, 2018 #9

    Redtail

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    Oops, stand corrected. Forgot to take the engagement into consideration. I need to order a new one too. 15" it is.
    Thanks
     
  10. Apr 15, 2018 #10

    Dennis Flamini

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    Chris,
    Item # 11 in the drawing is a bushing tapped from both ends and is the one i have never been able to remove without stripping the treads, maybe Danny can offer some help. Of course any rework of the threads is impossible without removing the tank. Let us know how you do.
     
    Last edited: Apr 15, 2018
  11. Apr 16, 2018 #11

    Bond007

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    If the threads mess up I have a big tap I use to chase them ,u can do it with tank still installed
    Danny 007
     
  12. Apr 16, 2018 #12

    Dennis Flamini

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    Here is a photo of the fitting but without engine and hoses installed.

    Pitts firewall fittings cabane alum  batt floor tank install 12-11-15 003 (1).jpg
     
  13. Apr 16, 2018 #13

    Z32MadMan

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    Thanks for all of the help gents.

    I decided to pull the tank. It came right out. Made for a nice easy time removing the flop tube with the tank sitting on my work bench.
     
  14. Apr 16, 2018 #14

    dimcuesta

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    Most of you probably know this already, but I like my header tank! Reduced stress on the tank, no access panel required on the firewall, always good fuel supply, can fly with less fuel during acro, and more fuel during ferry.
     
    smizo likes this.
  15. Apr 16, 2018 #15

    cwilliamrose

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    Yep, and you can get rid of the flop tube too although most folks put one in the header tank.
     
  16. Apr 16, 2018 #16

    PittsDriver68

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    " is the one i have never been able to remove without stripping the treads"

    Teflon tape or other sealing and anti-seize goop?

    Best of luck,

    Wes
     
  17. Apr 16, 2018 #17

    cgzro

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    Yeah I agree its a better setup, I wonder why the certified planes dont use it?
     
  18. Apr 16, 2018 #18

    PittsDriver68

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    I suspect that the advantage was not obvious when the airplanes were initially certified and once the design has been frozen and approved by the FAA big changes are painful and expensive. And we know how frustrated Curtis Pitts was with the FAA by the time the S-2A paperwork was done.

    Best of luck,

    Wes
     
  19. Apr 16, 2018 #19

    Dennis Flamini

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    Here is a certified header tank...lots of hoses and lines vs a flop tube.

    Decathlon tank.jpg

    Decathlon tank2.jpg
     
  20. Apr 17, 2018 #20

    cwilliamrose

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    Decathlon?
     

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