“…5 According to this method, the deposit-forming tendency of the fuels is estimated in millimeters over the height of the sootless flame (smoke point), which in the case of jet fuels must be no less than 20 mm. 6 With an increase in the quantity of aromatic hydrocarbons the height of the sootless flame decreases . 7 However, the deposits formed in a jet engine depend not only on the height of the sootless flame but also on the vaporizability of the fuel.…”