Yes, cubic loading is suppose to be something you can compare across plane sizes. For example, a EF Yak87 at 5.5lbs would be a cubic loading of 8.18. I'm suggesting a cubic loading between 9.24 (best case) and 9.76 (worst case).

[link=http://adamone.rchomepage.com/design.htm]Heres the formula.[/link]