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Old Apr 27, 2013, 07:30 PM
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Coke Bottle Fuel Tank

Just like you folks I find it hard to find a tank to fit my ARF's so I opted for a plastic coke bottle.
I have had one in an Extra 330 for 3 years
and so far the bottle, lid and seal don't seem to have been affected by the fuel.

You can roughly shape it with a hot air gun which helps it fit between the formers.
For the lid I drilled three holes in a brass bolt and silver soldered the fuel tubes into that, then drilled out the coke lid for the fitting, Make sure it is seals though


Dave
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Old Apr 28, 2013, 02:48 PM
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Uh-oh, Slagbag........Don't say silver solder in this forum. I learned a lot about soldering from the replies. One of the things I learned is that like you, I called it silver soldering generically when technically it isn't. I like the idea of a coke bottle fuel tank though. I always thought a rounded bottom fuel tank would be better for picking up fuel, as opposed to a flat bottom tank. Thanks for the idea!
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Old Apr 29, 2013, 08:45 AM
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Plastic water bottle tanks are almost standard in gassers. The preferred bottles are the square Fiji bottles. That makes them easier to secure. A few companies offer stopper kits for water bottles.

Greg
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Old Apr 29, 2013, 01:06 PM
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But wouldn't a rounded bottom tank be better for picking up fuel and not air as the fuel level dropped? The fuel level wouldn't have to be as deep as in a flat bottom tank. As far as mounting it, a cradle could easily be fabricated to hold the tank. Feel free to comment if you think I'm off-base on this.
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Old Apr 29, 2013, 01:25 PM
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If you fly your tank down to the last drop a round tank might give you a bit less sputtering before it runs out. Gassers often use felt clunks so there are no bubbles anyway until the tank is completely empty. A regular clunk completely empties the rectangular tanks I use on my test bench.

Greg
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Old Apr 30, 2013, 02:31 AM
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Marty and Greg thanks for looking. As for round v square I would have to say round would be the most efficient, But what if you added a Wick to suck the last drop
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Old Apr 30, 2013, 08:03 AM
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The felt clunk I mentioned is a "wick".

Greg
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Old Apr 30, 2013, 03:26 PM
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gkam, I never heard of a felt wick type clunk.....who would have such a thing? My thinking on the round bottom tank is that you wouldn't need so much "unusable" fuel just to keep the clunk submerged, or maybe I'm just being paranoid about it sucking air.
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Old Apr 30, 2013, 03:51 PM
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There are two types of "bubbleless" clunks. There are the sintered variety used in glow engines, due to the use of castor oil in the fuel, and the felt type used in many utility engines(chainsaws, weedeaters).

http://www3.towerhobbies.com/cgi-bin...&I=LXXF25&P=ML

http://www.amazon.com/Oem-Fuel-Filte.../dp/B001OK8MJG

Greg
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Old May 01, 2013, 10:43 AM
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gkam, Thanks!
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Old May 02, 2013, 05:11 PM
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Should we be flying on close to empty tanks I hate dead sticks
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