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Light weight, high speed, compact power transmission shafts transmit torque through diaphragm type flexible discs whose planes are normal to the torque axis. The angular and axial misalignments are obtained by material flexure of these thin diaphragms within elastic limits. These shafts have multiple diaphragms used in series so that each diaphragm shares a portion of the total misalignment. Such shafts are used in high speed aircraft coupling engine mounted accessory gear box and aircraft mounted accessory gearbox. This paper deals with the design and development of light weight flexible power transmission shaft for high speed fighter aircraft application keeping critical speeds and weight as the design criteria. Since the number of design constraints is more, finite element analysis has been used as an effective tool for trying out various design iterations so that all the design constraints are met.

Use of water diesel emulsions in diesel engines has resulted in drastic reductions in NOx and smoke levels, while the thermal efficiency is also improved. The objective of this work is to evaluate the effects of using water diesel emulsion as the pilot fuel in a dual fuel engine with LPG as the primary fuel. Tests were conducted on a single cylinder constant speed DI diesel engine. An emulsion with a water to diesel ratio of 0.4:1 was used. Performance, HC, CO, NOx, smoke emissions and combustion parameters were obtained and compared with the case where pure diesel was used as the pilot fuel. At high loads, the brake thermal efficiency with the emulsion as the pilot fuel was better than that with diesel. NOx levels were drastically reduced. The already low smoke levels were reduced further with the emulsion. There was an adverse effect on HC and CO emissions. The maximum rate of pressure rise and peak pressure were also higher with the emulsion.