Thats a lot more variance than I could believe! Two tons of difference 9k to 13k+. How? Remember the new Pantera 41 based on the Apache 41 molds was made of fiberglass not kevlar (but has non Sc motors which should somewhat compensate) and was admitedly built on the heavy side because of its intended use (cowes) ect. and class weight minimum. 10.5k#'s.