Related by context. Frequent words. (Click for all words.) 52 flapping wings 49 flaps 46 laminar flow 45 flap 45 ailerons 44 rotors 44 dimpling 44 workpiece 44 laminar 43 flagella 43 butterfly wings 43 rotor 43 vanes 43 pivoting 43 dekes 42 airfoil 42 wingtips 42 apertures 42 jiggles 42 whirling 42 turbine blades 42 centrifugal force 41 mandibles 41 valvetrain 41 piston 41 multidirectional 41 blindingly fast 41 upshifts 41 glide 41 forelegs 41 actuation 41 whirls 41 blades 41 supersonic speed 41 speeds 41 nanosecond 41 spins 41 frictionless 41 aileron 41 combustion chambers 41 coiling 40 fairings 40 supersonic speeds 40 wings 40 staccato 40 actuator 40 vibration 40 torsional 40 brake lever 40 milliseconds 40 velocities 40 microscale 40 springy 40 afterburner 40 waggle 40 flapping 40 femtosecond 40 gliding 40 workpieces 40 hummingbird 40 spinning blades 40 grippers 39 tail feathers 39 twirl 39 feathery 39 Z axis 39 propeller blades 39 rhythmic 39 clubhead 39 vane 39 actuators 39 pulsations 39 elongates 39 jaw muscles 39 rotor blades 39 twirls 39 syncopated 39 curved surfaces 39 airflow 39 pistons 38 upright posture 38 beak 38 suppleness 38 shuttlecock 38 rhythmically 38 millisecond 38 clubhead speed 38 microsecond 38 shutter speed 38 fin 38 torque wrench 38 laser pulse 38 vortices 38 Brownian motion 38 downshifts 38 candle flame 38 whirs 38 slapshots 38 resonant frequency 38 jackrabbit 38 aerodynamically