I started experimenting with carbon frame construction in the last few months. After a couple of years of reading and research I settled on using tube-to-tube construction and wrapping the joints in prepreg carbon. In order to use prepreg I built a temperature controlled oven. It's a well insulated sheet metal box heated by two oven elements running on 120V for a total of 1250W. There is an aluminum fan blade driven by an external motor to circulate the hot air. It's all controlled by an Omega Instruments controller to +/- 1 deg at 250F.