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fuel bags

Old 11-19-2023, 08:43 AM
  #1  
zrikman
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Default fuel bags

Hi,
new here,
i'm currently buliding new Futura and i consider put fuel bags.. insted the normal fuel tank,
anyone have recomandation for feul bags?
i know the 3d Tomahawk Futura arrive with Fuel bags, but i don't know who manufacture them

Thanks in Advance
Zrikman.
Old 11-19-2023, 09:13 AM
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Dawn Ellzey
 
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Not sure if you are in the US but if you are fuel tanks must be rigid

The fuel tanks shall be of rigid construction with consideration given to burst and puncture resistance. Plasma bag
fuel tanks are not allowed. Consideration shall be given that non-metallic fuel lines may not be able to contact hot
parts of the engine as installed.
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Old 11-19-2023, 03:34 PM
  #3  
jvaliensi
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Originally Posted by Dawn Ellzey
Not sure if you are in the US but if you are fuel tanks must be rigid

The fuel tanks shall be of rigid construction with consideration given to burst and puncture resistance. Plasma bag
fuel tanks are not allowed. Consideration shall be given that non-metallic fuel lines may not be able to contact hot
parts of the engine as installed.
The AMA rules do not allow fuel bags. If you are flying outside of their rules, you can use bags.
Old 11-19-2023, 07:12 PM
  #4  
FenderBean
 
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Trying to work with AMA to get this changed in the future, so stay tuned
Old 11-19-2023, 07:39 PM
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FlyJ
 
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Originally Posted by zrikman
Hi,
new here,
i'm currently buliding new Futura and i consider put fuel bags.. insted the normal fuel tank,
anyone have recomandation for feul bags?
i know the 3d Tomahawk Futura arrive with Fuel bags, but i don't know who manufacture them

Thanks in Advance
Zrikman.
Contact Carlos at CMJ. He will make custom fuel bags for you.

https://cmjets.com/
Old 11-20-2023, 06:05 AM
  #6  
jvaliensi
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I don't understand AMA stance on fuel bags. The kevlar and fiberglass tanks bust open in bad crashes too. A broken tank does not mean a fire will start, and a tank that does not break does not stop a fire from happening.
A properly operated bag tanks means no air bubbles and less chance of flame-out. That seems like a safety improvement.
Old 11-20-2023, 06:37 AM
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BarracudaHockey
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Originally Posted by jvaliensi
I don't understand AMA stance on fuel bags. The kevlar and fiberglass tanks bust open in bad crashes too. A broken tank does not mean a fire will start, and a tank that does not break does not stop a fire from happening.
A properly operated bag tanks means no air bubbles and less chance of flame-out. That seems like a safety improvement.
It's just an old holdover rule from when people were stuffing plasma bags in jets, they would harden and crack over time and exposure to kerosene.

As Keith mentioned, I'm working on getting the rules modernized.

Changing anything in the AMA safety program now requires review and approval by the FAA so its a somewhat tedious process.

The OP isn't in the US in any case.

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