Attack Helicopter Alternative Tail Rotor Applicability

1. The objective is to examine alternative tail rotor concepts for the AH-IW that could result in a more agile and maneuverable, quieter helicopter that is more survivable and less susceptable to battle damage. Additional speed capability and other improvements will be assessed. Specifically, the following alternative design concepts will be explored: a. No Tail Rotor (NOTAR) b. Vectored Thrust Ducted Propeller (VTDP) c. Fan-in-Fin 2. In assessing the relative merits of each of the concepts, the study will include, as a minimum, estimates of the effect on aircraft weight, performance and flying qualities, systems integration requirements, operational limitations, optimized configuration for high speed forward flight, R&M comparisons to the current configuration, agility/ maneuverability considerations and the impact on survivability (e.g. noise, speed). The application of composite materials technology will also be addressed. 3. The product of this study will be a written report incorporating the comparative analysis at the 3 selected design concepts in each of the areas examined and a recommendation for the design concept to be explored in Phase II.