The ESA-led GRADECET project (Gravity Dependence of Columnar to equiaxed transition in peritectic TiAl alloys) involves researchers from Germany, Ireland, Slovakia, France and Hungary. Data for the GRADECET model are being gathered by solidifying TiAl across a spectrum of gravity levels. Gravity drives convection flows in the molten metal that influence the solidification process; change the level of gravity and the microscopic grain size of the alloy should change too. A quartet of casting furnaces will be flown on an ESA Maxus suborbital rocket in 2015. A previous furnace design flew on Maxus-8 in 2010, seen here with four cylindrical furnaces.