Rob, would a resonable question be for said engineer, "Is 400kpa XPS a resonable core for a harry?", or the corresponding 700kpa material? Or where they can be used safely?
Which is more like asking (where ) will h60 do? Or h45?
Perhaps more interestingly, can some parts of some of the harrys be made out of these as a cost optomization question? And what can't?
I mean, your asking the questions and paying the bills, so you do you. Untill I pony up the cost of a call to Scaled Composites, I got no reson to expect an answer.