HLVOLSDP [Colorado Space Grant]
The HLVOLSDP (Heavy Lift Vehicle Operational Launch Service Demonstration Payload) or DemoSat is only a 5993 kg instrumented mass to record multiple ride characteristics of the Delta-4H to be plugged into future military satellite and OSP designs. The vehicle flew a typical geosynchronous orbit-insertion mission profile and was to deliver the payload into an orbit above the geostationary orbit.
It was based on a demonstration payload constructed for the maiden Delta-4 flight, which was not used, as a real payload was available. DemoSat is a cylindrical outer aluminium structure 1.95 m high and 1.38 m diameter. The inner ballast consists of sixty brass rods, stiffeners, fasteners and fittings.
Two criteria had to be met in the construction of this demonstration payload:
As the structure is very robust, a late addition of the 3CS (Nanosat-2) payload to the DemoSat was possible. The dispenser was side-mounted on DemoSat.
The DemoSat reached a lower than planned orbit as the Delta-4H under-performed with shorter than planned CBC burn times, leading to a fuel shortage of the second stage during the last burn.
Nation: | USA |
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Type / Application: | Instrumented dummy payload |
Operator: | Boeing |
Contractors: | Boeing, Process Fab Inc. (structure) |
Equipment: | |
Configuration: | Cylinder |
Propulsion: | None |
Power: | |
Lifetime: | |
Mass: | 5993 kg |
Orbit: | 19027 km × 36406 km, 13.5° (36340 km × 36342 km, 10.0° planned) |
Satellite | COSPAR | Date | LS | Launch Vehicle | Remarks | |
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DemoSat (HLVOLSDP) | 2004-050A | 21.12.2004 | CC SLC-37B | P | Delta-4H | with 3CS 1, 3CS 2 |