Sorry,but I have to disagree.I had this same plane with a Brison 2.4,which I think weighs about the same as the RCS,weighing both with muffler,battteryand ignition,And it puts the plane too heavy for good 3D.General aerobatics is awesome,but 3D will suffer.the plane already needs nose weight when set up as per the instructions,but now with gas you have an ign.batt up front,and a reciever battery that shoud be at least 12"from the ign batt.with the ign.batt all the forward,and rx batt on the wing tube is only about 8" between them,which is a little risky,although I never had a problem,but any further back on the rx batt and you will be adding that much more nose weight.The plane was designed and built around a glow engine,and that's what it should have for optimal performance,light flies better period.I know you said you want gas,but trust me,use an OS 1.60,put the batt up front,ele and rudder servos up front,Rudder on pull-pull,and you will enjoy the plane the way it was meant to be.I expect some replies saying I am wrong,and I used to be one of the guys who believed gas was ok on smaller planes,but after much trial and error,I found out I was wrong.There is a thread in this forum titled please explain to me,in it there is some discussion about building light,Dick Hanson has some good comments,and I really think he knows his stuff.Here is a link to his sight where he put a ZDZ 40 ,which is lighter than the RCS and the Brison, on a H-9 Edge,which is larger than the Lanier,and he does not recomend it for good 3Ding.http://www.concentric.net/~Dhmodels/workshop6.htm