Many year I have work only on natural materials but a lot of people prefer modern, so I start work on carbon. I dont like glass on longbows. I have made few experiments - carbon back , in core, on belly , 2 sides carbon. In this moment im close to use carbon only for backing. 2 sides carbon is very fast, but for me to agressive combination. Carbon inside of limbs increase stiffnes with theseme mass but its strange , effeciency is lower. Maybe hysteresis grow? For me carbon backing and wood belly give best results - bows are very fast, but not "crazy", and very smooth, quiet and comfort.