Hi All,

On my Goldberg Extra 300 I am ready to mount the fuel tank and I have a question.

The engine chosen for this aircraft is an ASP 1.08, and the fuel tank space is only large enough for a 12oz tank if I use a regular Sullivan/Dubro/Great Planes tank. The 14 and 16oz tanks are all about 1/2" too long to fit. According to everything I have heard, a 12oz tank will only give about 6-8 minutes of time with this engine. I would like more than 10-12 minutes.

So, one thing that comes to mind is a dual tank arrangement, with a smaller (10oz?) tank up behind the firewall, and a larger tank (12-16oz?) near the CG. The engine does not have a pump. Muffler pressure will be available. Can this type of setup be made to work with what I have to work with? Do you have any other ideas that may work for this aircraft?

I was thinking of using something other than a real hobby fuel tank as a fuel tank, but I have not found a suitable substitute that fits the space. I was also thinking it would be good to keep all that weight (if I was able to get 20oz or so to fit) closer to the CG instead of way up front.

I should add that the stock tank location is on the engine centerline, and this version of the Extra is the early one with the shoulder mounted wing. So the location of the second tank would be almost directly behind the front tank and the top of the rear tank would be about 3/4 of an inch below the bottom of the front tank.

Thanks in advance!