Cafeen- Apparently, the guys who design these nice airplanes understand there are simpletons like me around who overly complicate every small detail. I drug out the plans I just received today and looked (shoulda done this first) at how this "problem" is addressed. Lo and behold-- Roy Vaillancourt knew I'd be along and gave an exquisitely simple solution to the tank being in the way. The plane is a 1/4 scale Birddog, and there's a box on front of the firewall to mount the engine to, so you just open up the firewall and put the tank inside the box, extending it through the firewall. It shows a 16 oz. tank, but a 20 will hide just as well. This is my 1st 1/4 scale bird and I plan to do it right. I might not make Scale Masters, but I'll at least impress all the girls at the field (?)[sm=lol.gif]