10-15 lbs could be done, but you are talking about a pretty expensive proposition. I have heard of a Kadet Senior, (kit built), that lifted 14 lbs, and I have seen some pretty impressive 'lift-planes' designed especially for lifting, but dropping that much weight will significantly alter your CG and likely make the plane un-flyable for a beginner.

Do you know how to fly RC airplanes?

What, exactly, are you trying to accomplish?

(I smell a troll)