I have a Sullivan 10oz ordered: [link=http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXFU38&P=0]tank[/link] and will advise if third attempt fits. I was not sure about the flexible ones so went with this one instead but agree it is an option.

h@gh: Any CG issues with the ST51? I added a bit to the rudder so I am hoping it balances off with the larger engine (ST muffler is a pig for weight).