On Feb 1, 4:50*am, wrote:

Perhaps limit it to old-fashioned fibreglass, not
CRP, to control cost, perhaps.

I think that would be majorly counterproductive. I'd have bought into
that a year ago, but I've seen the light: The most expensive part of a
glider has no mass, it is person-hours.

With carbon, it takes substantially less material to get the same
strength and stiffness as fiberglass. Less material means less stuff
to cut to shape. Less material means less epoxy to saturate it with.
Less material and less epoxy means less time spent doing layups and
less time in tyvek suits. And not only do you have a structure with
fewer person-hours invested in it, it is lighter than its fiberglass
equivalent. And that lightness has a way of cascading through a
structure, making many other parts lighter as well.

Thanks, Bob K.