Fuel tanks.... I bought the 3 litre tank as an extra to the kit - it's the soda-bottle shown below - but I personally have a bit of a dislike for soda-bottle tanks since I just feel that they are more prone to bursting than goold old Kevlar etc tanks. Also, the 3 litre soda bottle has no baffles in it, so that sloshing of fuel occurs easily. I'd seen a magazine article or two on making your own fuel tanks, so I decided this was a perfect time to try this for myself.

First I had to make up some foam shapes representing the tanks. I decided to make up two tanks, shaping them to fit the underside of the fuselage and to fit around some bulkheads. I also wanted the vent lines to be on a "bubble" on top of the tank to ensure that the tanks really fill befor ethe overflow occurs (I've seen far too many tanks where half a pint or so of capacity is wasted due to the tanks not really filling). My first idea is as shown in the pics where tere is a balsa "bubble" attached to the foam.