Abstract: A turntable for the rotation of automobiles, other motor vehicles, and displays with an optional center lift jacking system accessory. The turntable includes base arc and centering segments, arm and deck segments. The deck segment receives a vehicle. The turntable includes a center hub connecting the deck segments. The center hub comprises a removable center plate and houses telescoping cylinders that make up and comprise the optional center lift jacking system. A removable cradle mounts to the jacking system which holds the vehicle safely in place when raising or lowering the vehicle. The turntable includes rotating arms extending from the center plate, and a gear segment connected to the arms. The gear segment connects to a drive shaft via a worm gear. The turntable includes a motor connecting the drive shaft causing the gear to rotate, which in turn rotates the gear segment. Rotation of the gear segment causes the arms to rotate with support from the roller assemblies.

Abstract: A four-ported dump combustor is designed for use with a ramjet engine and ovides high combustion efficiency and pressure recovery for length-to-diameter (L/D) ratios of between 1.3 and 4.4, over a range of operating conditions.