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2. Erb Range - Wikipedia

   en.wikipedia.org/wiki/Erb_Range

   The Erb Range) is a rugged mountain range rising to 2,240 metres (7,350 ft) between Kosco Glacier and Shackleton Glacier in the Queen Maud Mountains, and extending north from Anderson Heights to Mount Speed on the west side of the Ross Ice

3. Critical speed - Wikipedia

   en.wikipedia.org/wiki/Critical_speed

   Stiffness of the shaft and its support; Total mass of shaft and attached parts; Unbalance of the mass with respect to the axis of rotation; The amount of damping in the system; In general, it is necessary to calculate the critical speed of a rotating shaft, such as a fan shaft, in order to avoid issues with noise and vibration.

4. Dunkerley's method - Wikipedia

   en.wikipedia.org/wiki/Dunkerley's_Method

   When an element of mass is offset from the axis of rotation, centrifugal force will tend to pull the mass outward. The elastic properties of the shaft will act to restore the “straightness”. If the frequency of rotation is equal to one of the resonant frequencies of the shaft, whirling will occur. In order to save the machine from failure ...

5. Vertical Hummingbird - Wikipedia

   en.wikipedia.org/wiki/Vertical_Hummingbird

   The Hummingbird is a development of the certified Sikorsky S-52 that first flew in 1947, adapted to kit form. The aircraft features a single main rotor, a four-seat enclosed cabin, quadracycle landing gear and an option for skids. [1]

6. Power take-off - Wikipedia

   en.wikipedia.org/wiki/Power_take-off

   A split shaft PTO is mounted to the truck's drive shaft to provide power to the PTO. Such a unit is an additional gearbox that separates the vehicle's drive shaft into two parts: The gearbox-facing shaft which will transmit the power of the engine to the split shaft PTO; The axle-facing shaft which transmit the propelling power to the axle.

7. Sting (fixture) - Wikipedia

   en.wikipedia.org/wiki/Sting_(fixture)

   Bent stings usually produce higher aerodynamic interference than straight stings. If the test object (model) has a "boattail" rear end without a well-defined base through which a sting shaft can enter the model, a so-called Z-sting can be used, having a form reminiscent of the Latin