I've been trying to figure that out. It's not as simple as reading a number off the side since I can only see the bottom. But I do have another tank that looks the same as the one in the Snipe and it's labeled OK Model 220...so I'm assuming that's 220ml, which would be about 7.5oz. That's definitely too small.

But it would take some serious engineering of the Snipe's interior to make room for a larger tank. Also as things are now, to remove the tank requires that I remove the 3mm music wire running through the wings. And to remove that music wire, I need to remove the wings, which means removing (and replacing a dozen or more rigging wires.

Remember that the model was originally designed with a 50-class engine in mind.