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Since March 1, 2006, the United States Golf Association (USGA) has imposed a limit on maximum moment of inertia (MOI) of golf clubheads. The limit is on moment of inertia around the vertical axis through the clubhead center of gravity (Izz). On April 11th 2006, the USGA announced that the maximum allowed MOI has been […]

Aerodynamic Flutter on Aircraft Control Surfaces – Testing and Measurement Analysis Flutter is of great concern to any pilot, since excessive flutter has caused a number of aircraft to lose control and crash. Although any surface on an aircraft which is exposed to air flow can experience aerodynamic flutter, the most common type of flutter […]

By first measuring the static moment of the individual turbine blades and then sorting them into the ideal order, jet engine manufacturers have found that they can greatly reduce the time and effort required to balance the rotor of an engine. More recently a new concept has emerged: if a computer record is kept of […]