[NSRCA-discussion] SODA BOTTLE FUEL TANK

[Wayne Galligan]

Jim,

Glad it worked for you.   The weight savings I get over using a 20 oz. DuBro tank is 1.7oz.   I still get the same amount of flying time with the 16.9 oz. coke bottle tank even though it is smaller.  I can draw fuel better because of the curve of the bottle and the indents at the back of the bottle keep the clunk in the fuel better.  So technically I am saving 1.7oz of weight with the bottle plus I am not carrying around about 3 extra oz of fuel that I normally would in the DuBro tank.  The flat bottom of the DuBro tank does not lend to a good fuel draw when it is near the last three or four oz.  I thought about using a bladder tank but after trying this it wasn't necessary.

Wayne

  ----- Original Message ----- 
  From: jivey61 at bellsouth.net 
  To: NSRCA Mailing List 
  Sent: Thursday, February 16, 2006 4:17 PM
  Subject: Re: [NSRCA-discussion] SODA BOTTLE FUEL TANK


  Wayne
   I just flew the coke bottle tank today and I get 15 minutes on 24 oz of fuel.It actually draws fuel down to 1 oz in the tank,doing the Masters pattern.
  The upside is I don't have to fill it full to complete the pattern. The weight savings is 2.5 oz using this tank.
   To review...... this was a 33 oz, 1 liter coke bottle' that I pickled with 30 % heli for 2 months.

  Jim Ivey
    ----- Original Message ----- 
    From: Wayne Galligan 
    To: NSRCA Mailing List 
    Sent: Thursday, February 16, 2006 8:28 AM
    Subject: Re: [NSRCA-discussion] SODA BOTTLE FUEL TANK


    Wow!!!  24 oz....    I can fly 15 min. on the 15.9 oz. bottle with my OS 1.40.  I was wondering why these wide body planes started getting so popular.... got to have'em so you can put a big enough fuel tank in them.

    Wayne

      ----- Original Message ----- 
      From: jivey61 at bellsouth.net 
      To: NSRCA Mailing List 
      Sent: Wednesday, February 15, 2006 8:36 PM
      Subject: Re: [NSRCA-discussion] SODA BOTTLE FUEL TANK


      Wayne
       I was getting ready to update my experiment with the 33 oz coke bottle filled with fuel 30%. I let it sit and shrink for 2 months,then when it appeared to stop shrinking I removed the fuel and carefully measured the volume.The bottle started life as 33 oz,1 liter and now holds 24 oz liquid. Which is perfect for a thirsty 160 DZ with a 4 blade prop.I have it in my Smaragd and will fly (test) tomorrow. Should work fine and no more shrinking.

      Jim Ivey
        ----- Original Message ----- 
        From: Wayne Galligan 
        To: NSRCA Mailing List 
        Sent: Wednesday, February 15, 2006 6:21 PM
        Subject: [NSRCA-discussion] SODA BOTTLE FUEL TANK


        FYI...   I had a conversation with a flying friend the other day about the
        soda bottle fuel tanks and the way they shrink.  He happens to work for
        Pepsi and explained to me that the bottles are blow molded.  He said if they
        are not used with in a certain period of time that the memory in the plastic
        takes over and they will shrink in size and then they have to discard the
        old bottles.  The carbonized soda keeps the shape of the bottle till used.
        He said that most likely the nitro content speeds up the process and could
        explain why some of you using them with higher then 15% nitro are
        experiencing this phenomenon.
        So.... drink another one.... rinse and fill.

        Wayne Galligan



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