IOS' filament winder
Tightly winding pre-impregnated (pre-preg) carbon composite fibres (tow) over a hard thin shell (mandrell) produces the some of the strongest and lightest structures and vessels possible with modern technology. This technique, known as filament winding, allows rapid automated production of high-performance propellant tanks, fairings, and ablative engine casings. In order to reduce development and production costs, the IOS team designed and built its own filament winder in-house. The winder is capable of building propellant tanks with diameters up to 2.5 ft and lengths of up to 30 ft.
IOS is also building a series of new filament winders. When complete, the new winders will drastically increase IOS' propellant tank production rate.
IOS' Composite Room
In addition to filament winding, IOS also uses the hand-layup method for the manufacture of its composite rocket components. Fiberglass fabric, carbon fabric, epoxy, and phenolic resin are used to build these parts. IOS has built fairings, tanks, ablative combustion chamber, and ablative nozzles using the hand-layup method. Hand-layup is more labor-intensive than filament winding, but facilitates rapid prototyping and easy construction of complex parts.
Static test: CPM main rocket engine
Every IOS rocket engine is designed, tested, and built in-house. IOS had two dedicated, fully-instrumented static engine test sites at the Mojave Air and Space Port. Each rocket engine is ground tested and certified before integration into a launch vehicle.
The aluminum rocket engine injector components are mass produced using CNC methods. Other engine components, including the ablative engine combustion chamber and nozzles, are manufactured using filament winding and hand-layup manufacturing techniques.
IOS technician welding the company engine test stand
IOS has a fully equiped machine shop at its headquarters in Mojave. Most of the required rocket components can be prototyped, machined, or welded in-house. Both metal and composite parts are processed in the machine shop. All engineering staff are required to be proficient in the machine shop, and assist technicians with manufacturing as needed. Integrating engineering design and manufacturing increases the speed and efficiency of the design process.