I have on order an all-carbon-fiber CCR 75 from Carolina Composite Rocketry. It has been modified to fit my 75/7680 case, to fly on an Aerotech M685W. RASAero simulations put it at just over 40,000′ from Black Rock. Hopefully it’ll be ready for XPRS 2013.
I’ll be doing an experiment to see if a tailcone will help the drag coefficient. Using the Rouse-tech aft tail cone closure on one flight, and a normal aft closure on another flight.
These tests will probably happen after the maiden voyage at XPRS.