ORIGINAL: a cowell
Guys ive had an idea and would like to know if any one else has done this or if it is even at all possible.
Basically instead of routing vent lines to an outlet on the models surface under the fuse or where ever, Can you route a vent to another very small empty fuel tank inside the model which is in itself open to the atmosphere via an uncapped fitting in the bung?
Yes that is fine from a physics perspective, not so sure about it's "real world" practicality, however.
You would have to make sure that this inside "catch tank" is big enough to do the job (you said the tank would be "very small" so you have to be careful there). Being "big enough" to do the job is the overriding issue here. If the internal catch tank is too small then you run the chance of overflowing the fuel into the inside of your model (either upon filling the tanks or at some point while flying the model due to fuel sloshing, expansion/contraction of the tanks, etc.).
IMHO, if you have that much room in the model, then you should just use that internal "catch tank" as another fuel tank to have more usable fuel to burn in the air, and again move the "catch" tank (or "taxi tank" so to speak) and the final "vent" to the outside of the model. Nothing to be gained by flying around with the catch tank on board.
Hope that helps,