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I also started to think about the petrol tank. The seat can be made in 2 halves, the tank however depending upon its design will have to be made in at least a 3 part mould, two halves for the top surface and at least one for the bottom. The top and the bottom will then have to be bonded together. The inner bonding layer would need to be a resin impervious to attack by ethanol. The body of the tank would be Kevlar reinforced carbon fibre.
I wanted about a 4 gallon tank to give enough range and I also wanted the fuel carried as close to the centre of gravity as possible. Moving the battery and coils from above the rear cylinder would help with both these objectives. I also felt it would be better to try and restrict the extent to which the tank over-reached the top frame rails.
The first problem was where to start, defining the side view or defining the underside of the tank, consideration also had to be made as to how it would be secured to the frame, the position of the tap(s) and the filler and breather pipes and the extent to which baffles may be required within the tank to prevent sloshing.
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