Abstract: An aircraft rotor assembly has a central hub and a plurality of rotor blades coupled to the hub for rotation with the hub about an axis, each blade having a Lock number of approximately 5 or greater. A lead-lag pivot for each blade is formed by a flexure coupling the associated blade to the hub. Each pivot is a radial distance from the axis and allows for in-plane lead-lag motion of the associated blade relative to the hub, each pivot allowing for in-plane motion from a neutral position of at least 1 degree in each of the lead and lag directions. Elastic deformation of the flexure produces a biasing force for biasing the associated blade toward the neutral position, and the biasing force is selected to achieve a first in-plane frequency of greater than 1/rev for each blade.

Abstract: An aircraft rotor assembly has a central hub and a plurality of rotor blades coupled to the hub for rotation with the hub about an axis, each blade having a Lock number of approximately 5 or greater. A lead-lag pivot for each blade is formed by a flexure coupling the associated blade to the hub. Each pivot is a radial distance from the axis and allows for in-plane lead-lag motion of the associated blade relative to the hub, each pivot allowing for in-plane motion from a neutral position of at least 1 degree in each of the lead and lag directions. Elastic deformation of the flexure produces a biasing force for biasing the associated blade toward the neutral position, and the biasing force is selected to achieve a first in-plane frequency of greater than 1/rev for each blade.

Abstract: The invention provides methods, kits and materials for determinining simultaneously signature sequences of a population of tagged polynucleotides. Size ladders of polynucleotide fragments are generated from the population of tagged polynucleotides that contain a plurality of size classes. After the size classes are separated, tags of the separated fragment are copied and labeled according to the identity of one or more bases at the ends of the fragments. In a preferred embodiment, the labeled tags are then specifically hybridized to plurality of identical microarrays of tag complements such that the tags from different size classes are hybridized to separate microarrays. Signature sequences are determined by signals generated at hybridization sites having the same address on each of the plurality of microarrays.