Back From JAXA Part 1

Here's that Photo Again...

33 Days On The Road - What Did I Find?
It was a tough little road trip, hopping from island to island, covering 2 documentaries for a very big documentary company. We went from Sydney to Narita to Okinawa (via Nagoya), then to Tanegashima (via Kagoshima) where they have the Space Center, then to Nagoya (via Kagoshimaa once more) and onto Tsukuba (via Narita), and then back to Sydney from Narita.

So Which bits exactly were JAXA? All of it except for Okinawa and Nagoya - Nagoya is where Mitsubishi Heavy Industries build rockets for JAXA. JAXA scatters itself widely across the Japanese archipelago. They have observations stations in Okinawa, and they have high altitude engine test-firing facilities, north of Sendai.

JAXA is what the old NASDA and a sundry bunch of organisations has been rolled into in ordert o be a more unified organisation. In the wake of the HII Rocket program being shutdown, a total re-organisation took place. Installled at the head of the organisation was Keiichi Tachikawa and theoretically, the whole organisation is meant to have unified into one big space development agency.

The Launch
The HII-A No. 9 launch we saw on the 18th of February represents a milestone accomplishment in many areas for JAXA. The No.9 launch delivered the largest payload into orbit, and it was part of a double launch that happened within a month of the 23rd January launch of the No.8 vehicle. In other words, it was the first time rockets were assembled parallel to one another in the big Vehicle Assembly Building and wheeled out to launch one after the other.

A lot of emphasis was made by the publicity people that what wass significant in this process was how two rockets were launched in quick succession; much more so than the issue of payload. Rocketry, it turns out is not comlex in its concept or in its component parts. If anything theey use tried and tested materials and parts. What is truly cutting edge about any rocket technology lies in the system engineering aspect, managing the diverse technological needs that go into successfully organising and assembling for launch. At the critical stages, at 270 seconds from laucnh the system goes into full automatic. People take shelter in the blockhouse or over 3.2 kilometres away.

The Rocket
The HII-A Rocket is the successor to the HII rocket. The HI Rocket was a rocket made mostly of imported technology. So the HII was developed during the 1990s with fully domestic Japanese technology. The problem was it turned out to be a very complex machine with too many parts, which in turn meant it was a very expensive machine to fire. This meant it was more vulenrable to failure and so when the HII program was cancelled, a concerted effort was made to streamline the cost of the rocket as well as reduce the number of parts. The result is the HII-A rocket.

The HII-A rocket has far fewer parts than its predecessor. The most important 'part reduction 'took place in the black ring you see in the above ph0to. A quick way to tell apart the HII and HII-A is the 'interstage section'. The HII had a yellow metal ring. In the HII-A, it has now been replaced by a composite black material that has 80% fewer parts.

The payload of the HII-A rocket is 10 tons for Low Earth Orbit and 4 tonnes for Geostationary Orbit. In the future, they are hoping to make the HII-B rocket with up to 16.5 tons of payload to Geostationary Orbit.

The HII-A rocket is a 2 stage rocket with a main drive using a Liquid Oxygen and Liquid Hydrogen drive. In addition to the liquid fuel are the Solid Rocket Boosters and the secondary strap on boosters that fire solid rocket at launch. What makes the HII-A interesting is how the second stage engine is turned off and on during its flight. The rocket itself weighs in at 285tons, but the combined thrust of the first stage liquid fuel engine and the boosters is in the vicinity of 500 tons. With the HII-A rocket, Japan's aerospace lift capacity matches that of the ESA's Arianne 5, and the USA's Delta. What's remarkable about it is the cost with which they achieve their lift-offs. However, I'll leave that discussion for tomorrow.