Demonstrator of Atmospheric Reentry System with Hyper Velocity

ROCKET SCIENCE

Orbital Elements
Orbit: Geostationary Transfer Orbit
Perigee: 500 km
Apogee: 36,000 km
Inclination: 28.5 deg
Size
Height: 988 mm (including Antenna)
Width: 700 mm
Depth: 540 mm
Weight
Wet: 88.9 kg (including Capsule)
Dry: 85.8 kg
Capsule: 18.9 kg

Sagamihara - Jan 21, 2002
Atmospheric hypersonic flight is one of the key technologies not only for planetary entry probes but also future space transportation systems. DASH (Demonstrator of Atmospheric Reentry System with Hyper Velocity) mission is a collaborative mission between ISAS and NASDA.

The main objective of the mission is to demonstrate high-velocity atmospheric earth reentry at the velocity over 10 km/s and to conduct "high-velocity reentry measurements" by onboard instruments during the flight. DASH system developed by ISAS is scheduled to be launched by H-IIA rocket on Jan. 31, 2002.

The spin-stabilized satellite DASH has a total weight of 86kg, which can be divided into two portions: a re-entry capsule to conduct re-entry experiment, and its carrier involving a propulsion system, a communication system, attitude and orbit control systems, and others.

The attitude of the DASH system at the separation from the rocket is stabilized by the momentum wheel until the ignition of the spin motor (SPM). In order to reduce the reentry point dispersion, the attitude of the orbiter is maneuvered by the cold-gas jets based on the earth-horizon sensor (HOS) and the sun sensor (PSAS).

After the deorbit by ignition of the deorbit motor (DOM), the orbiter deploys the yo-yo despinner and the capsule is separated. The DASH orbiter is inserted into the geostationary transfer orbit (GTO). The orbiter in GTO adjust the orbital period by the drift motor (DFM) for the reentry to the planned point.

Three days after the launch, the capsule separated from the orbiter will conduct reentry over the Sahara desert in Mauritania. The capsule is exposed to the extremely high aerodynamic heating rate up to 10 MW/m2. The obtained data are transmitted through the telemetry to the ground stations during the slow descending phase after the parachute deployment.

The geometry of the reentry capsule is designed so as to have natural aerodynamic stability as well as to perform its ballistic reentry flight. Due to the strict requirment for lightweight and minimum envelope, a blunted cone is selected for the configuration.

The capsule subsystems are composed of the mainframe structure, onboard instruments, the thermal protection and control systems, and parachute system including pyro-technique separation devices. The capsule's diameter is 40 cm and its total weight is 19 kg. The capsule is thermally protected by the carbon phenolic ablation heat shield. The cross-type parachute is installed in the capsule.

RLV ALERT

Japan Tests Reusable Rocket Vehicle

Tokyo - August 8, 2001
ISAS has conducted second flight test campaign of reusable rocket vehicle test (RVT) since 9 to 26 June at ISAS's Noshiro Testing Center in the northern part of Japan main island.

Thanks for being here; We need your help. The SpaceDaily news network continues to grow but revenues have never been harder to maintain. With the rise of Ad Blockers, and Facebook - our traditional revenue sources via quality network advertising continues to decline. And unlike so many other news sites, we don't have a paywall - with those annoying usernames and passwords. Our news coverage takes time and effort to publish 365 days a year. If you find our news sites informative and useful then please consider becoming a regular supporter or for now make a one off contribution.
SpaceDaily Contributor $5 Billed Once credit card or paypal		SpaceDaily Monthly Supporter $5 Billed Monthly paypal only

The content herein, unless otherwise known to be public domain, are Copyright 1995-2016 - Space Media Network. All websites are published in Australia and are solely subject to Australian law and governed by Fair Use principals for news reporting and research purposes. AFP, UPI and IANS news wire stories are copyright Agence France-Presse, United Press International and Indo-Asia News Service. ESA news reports are copyright European Space Agency. All NASA sourced material is public domain. Additional copyrights may apply in whole or part to other bona fide parties. Advertising does not imply endorsement, agreement or approval of any opinions, statements or information provided by Space Media Network on any Web page published or hosted by Space Media Network. Privacy Statement All images and articles appearing on Space Media Network have been edited or digitally altered in some way. Any requests to remove copyright material will be acted upon in a timely and appropriate manner. Any attempt to extort money from Space Media Network will be ignored and reported to Australian Law Enforcement Agencies as a potential case of financial fraud involving the use of a telephonic carriage device or postal service.