Thanks guys.

I am a noob and when I see things like 15 or 40 size plane e.g. the E-Flite Apprentice is referred to as 15 size plane and another that was smaller referred to as 40 size, it was confusing. Have a better idea now of what I am looking at. Has to do with that watts per pound thing. The smaller plane mentioned was balsa and heavier than the foam apprentice. Think I got it now.

OBTW - I did read through "EVERYTHING YOU WANTED TO KNOW ABOUT ELECTRIC POWERED FLIGHT" just didn't make the relation between the W/Lb and the sizing.