Capgains,
Yes times have certianly changed, as now the engine limit for the scale planes is .26 cid...the reason? .15 engines didn't have the poop and the planes were under powered and squirrly at best. The JKA's thrive on .25 class engines. When I was talking about my Mag .15 Xl it is what I use on my (A class) open class airplanes such as my Spad, or like a Battle Floyd or a Fun Bat. If you are getting into scale combat, definately go with a .25 such as a Norvel, Irvine (my fav.) or Mag .25 Xl.