I've agreed a bit of a cool job. Customer oens a dutch GRP velomobile and wants to replace some of the GRP panels with prepreg carbon to save weight.
This particular model is interesting in that the monocoque is also composite, which makes evenmore room for weigh savings.

I will post photos of the project as I go along.

Here's the beast:



GRP monocoque:

Looks interesting, like the horn in the first image, it may have been better placed outside . What was the estimated weight saving  ?

I estimate half, I'm going to aim for 33%, so hopefully 2Kg total.

I need to think what schedule to use. I'm undecided whether to use a single layer of 645gsm or 3 layers of 200gsm.

I would personally use 2 layers of 200gsm in the middle of the panels, one at 90 degrees and one at 45 degrees.  Then add a few more layers around the edges and some foam cored ribs for stiffness.