Sig 4* Big PROBLEM!
4*60 tank...
The tank supplied with the 4*60 arf, and a number of other planes, are stamped World Models. I've personally seen four of these leak around the stopper this Spring. Two of these were in my planes.
It's as if the stopper material shrinks over a fairly short period of time. I've never had these problems with a Dubro or Sullivan.
The trash pickup here was last Thursday. They hauled my world models tanks away for me.
Larry