coke bottle tanks

[Jim Ivey]

All    FYI
 I am still experimenting with the plastic bottles to use for tanks.I used coke bottles that shrunk.I have filled half way a closed 20 oz Aquafina water bottle with 30% heli and let it set for 1 week. I started with a middle diameter of 2.687 inches and a height of 8 7/8 inches. The bottle now is 2.556 inches in diameter and 8 5/8 inches high.The bottle is much smaller, fluid wise.
I am suspecting any of these bottles will shrink with fuel in them.The solution is to use the tank maybe 4-5 times and throw it away and make another. Knowing this You can get a quick weight loss of 2 oz for instance at the nats or anywhere you will be weighed.   Practice with the tettra's.
 Velly intresting.

Jim Ivey


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