Abstract: A helicopter transportable mud pump made into three stages, each of which is separable from one another. Each pump stage is made into a lightweight sub-assembly which can be lifted by a helicopter into inaccessible locations. The adjacent crankshaft ends of the assembled pump stages are series connected in axially aligned relationship respective to one another by a special coupling and drive means. The coupling means is comprised of two coacting coupling members, each of which have confronting faces connected together in a manner to dispose the adjacent shaft ends of the multi-stage pump 120.degree. out of phase respective to one another. The coupling halves are identical in design so that only one member must be duplicated during fabrication of the device.

Abstract: A helicopter transportable mud pump made into three stages, each of which are separable from one another. Each pump stage is a light weight sub-assembly which can be lifted by a helicopter into inaccessible locations. The adjacent crankshaft ends of the assembled pump stages are series connected in axially aligned relationship respective to one another by a special coupling means. The coupling means is comprised of two coacting coupling members, each of which have confronting faces connected together in a manner that also causes the adjacent shaft ends of the multi-stage pump to be connected 120.degree. out of phase respective to one another. The coupling halves are identical in design so that only one member must be duplicated during fabrication of the device.

Abstract: A hydrodynamic brake apparatus having multiple stage rotor and stator assemblies housed within a main body. A shaft is journaled to the main body and connected to the rotors, so that power input to the shaft is dissipated by the reaction of the hydraulic fluid contained within the main body. An impeller connected to the shaft forces fluid to flow outwardly to the outer marginal end thereof where the fluid is directed across a stator. From the stator the fluid is forced against the turbine which also is affixed to the shaft in spaced relation respective to the impeller. The turbine forces fluid to flow against a housing stator. The fluid returns through the main body to the impeller, or through a cooler and then back into the main body.