I'm told these 25% models can weigh in at 18 lbs. or there about. Guys do like to brag about how light they build.
I personally believe a reasonable amount of weight is necessary for a better flying model. Hey, it may not go verticle, but the Gee Bee's wern't designed for that.
http://cfcgraphics.com/Gee_Bee_Z.html
harles