More tach readings

15% nitro, 18% oil. Different muffler.
I made an inverted muffler out of alluminum, 4-40 rod and nuts, and JBWeld. A brass pressure nipple and some SS screen door screen for sound reduction and added back pressure are also included.

MAS 12x8: 13,000 RPM
TF 14x6 PP: ~10,000 RPM (Too much prop-engine ran hot and wouldn't hold a consistant peak RPM)