Cases--which are also the airframe--are 6061-T6; liner is cast in place EPDM. Grain is a center burning finocyl, also cast in place. Bill Sent from my iPhone On Oct 16, 2013, at 15:56, Daryle Dismukes <daryled@xxxxxxxxx> wrote: > Those of you who are working with fuel grains in the 150mm / 5.5-6 inch > diameter range, what are you using for your motor cases and liners? The > largest I've done before is 98mm, and I used as much off the shelf Aerotech > hardware as I could. Now I need to do something larger in a hurry at work and > I'm hoping to find a source of pre-made carbon phenolic tubes between 5.5 to > 6 inches in diameter. Any sources or ideas? Other things to try? > > -Daryle