The more I talk to Morita Sensei about the Epsilon, the more I am struck by how important it is to Japan’s strategic solid-fuel dual-use technology maintenance program. Those of you who know your rockets will know that the last two generations of ISAS sold LVs have been judged as readily convertible to ICBMS, and also the J-1, the last time Japan “mixed ‘n’ matched” technologies from its NASDA derived and ISAS derived programs.
But the Epsilon is very very different. Or is it? Where else other than in Japan could you develop a launch-on-demand rocket/ missile for $200 million? The Epsilon rocks! It is only an extreme budget squeeze that is stopping it from launching in its full configuration in 2013 right away. First of all, here is the article I recently wrote for Space News:
The technical changes being made to develop the Epsilon seem to have fully taken on board and learned from the mistakes made for the J-1 (featuring Tomifumi Godai, about whom I talk more about below), which, in one of my favorite articles for Space News in the 1990s, was “hammered” for its costs after a report by the Management and Coordination Agency showed that the J-1 development program cost more than similar projects in other countries. At the time I could see the mantra; Japan was trying to switch to genuinely be seen to cut costs from practically nothing to vapor, while underneath the J-1 was always mainly a technology development program to see if it could integrate an ICBM from its liquid and solid development programs. In terms of the cost per launch, the J-1 was really quite expensive. But in terms of technically showing how easy it is for Japan to produce ICBMs, the J-1 was quite a piece of work!
Here is the Commission to Assess the Ballistic Missile Threat to the United States
Appendix III: Unclassified Working Papers assessment of the J-1: 
To jog your memory: the J-1 was a three-stage solid fuel rocket able to place payloads of about 1,000 kg int low Earth orbit and the first NASDA rocket to be made from a combination of existing indigenous rockets – the solid rocket booster of the H-2 and the upper stage of the M-3S II. In other words, after an awfully long, twisting and tortured route down the J-1U -> J-2 -> GX route, which was basically IHI’s bid to become a liquid engine technology integration company, the Epsilon is the direct successor of the J-1. The Epsilon is what the J-1 should have been.
Does any of this, taken from the Japan Echo of 15 years ago, sound at all similar?
Information Bulletin No.64
First Launch of Cost-Efficient J-1 Rocket Scheduled for February 1996
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January 8,1996
The National Space Development Agency of Japan (NASDA) is in the process of assembling a new domestically produced rocket, the J-1. Scheduled to be launched from the Tanegashima Space Center in February 1996, the J-1 features a cost-efficient design that incorporates parts of existing rockets. It will carry as its payload an experimental space vehicle that will gather data to be used in the development of a Japanese space shuttle, HOPE.
The mainstay of Japan’s space program is today the H-2, the first of which was successfully launched in 1994. The H-2, which can boost a two-ton satellite into geostationary orbit 36,000 kilometers above the equator, is a two-stage rocket fueled by liquid oxygen and liquid hydrogen. The J-1, on the other hand, is a three-stage rocket designed to place a satellite of about one ton in low orbit. It was jointly developed by NASDA and the Ministry of Education’s Institute of Space and Aeronautical Science with an eye to a likely increase in the demand for rockets to put into low orbit small telecommunications and other satellites.
To save on development and production costs, current plans call for the first J-1 to incorporate the type of solid-fuel rocket now being used by NASDA as boosters for the H-2; the second and third will use a combination of the M23 and M3B sold-fuel rockets that constitute the tip of ISAS’s M-3SII. The J-1, which stands 33 meters tall, measures 1.8 meters in diameter, and weighs 87 tons is rather small compared to the H-2-50 meters tall, 4 meters in diameter, 264 tons-but was developed for only one-ninth of the cost, or 3.1 billion.
The first J-1, scheduled to be launched on February 1, 1996, will carry as its payload the 1,050-kilogram HYFLEX …” [X-37B space bomber test... no no, only joking. It's nothing like the X-37B space bomber at all; here it is landing, right] “…a hypersonic flight experiment vehicle that will collect data for the development of a Japanese space shuttle, named HOPE. HYFLEX will separate from the J-1 at an altitude of 110 kilometers and glide back through the atmosphere. Scientists will be evaluating such points as HYFLEX’s heat-resistant properties as it reaches temperatures as high as 1500-1600 degrees Celsius and its stability and control systems as it hits speeds of up to Mach 15. After completing its glide, the HYFLEX will deploy a parachute and splash down in the ocean near the island of Ogasawara, where it will be retrieved by waiting ships.
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The wonderful thing about this article is that it shows what they Japanese call the 急 (Kyu) pichi (pitch) or the rapid assault on the higher strategic echelons of space development. It’s hard to believe going back to 1990s with the hubris and triumphalism; with people like Tomifumi Godai, the godfather of the H-2, regaling Japan for its prowess in building better than the gaijin. The NYT article I linked to, unlike the screed put out these days, is actually worth reading! Godai’s pride in the H-2 was soon deflated though and his triumphalist series of articles in NASDA today in the 1990s has now disappeared from web and written out of history. But I remember.
It’s worth reminding people, I feel, that with a little bit more money, Japan would have had its own automated shuttle by now. It’s not doing too badly as it is with Kounotori, which is itself a technical triumph and a bargain- costing only $200 million or so to develop (officially).
But, literally, Japan lost Hope. In caffeinated and wilder-eyed moments I often wonder how much pressure was put on Japan to sacrifice its space program on the altar of fiscal restraint when other much more wasteful spending programs survived. (I often marvel at how quickly SmartSat disappeared too…did someone in the U.S. embassy gently whisper sweet somethings in NICT’s ear so as not to show up the U.S. or frighten the Chinese too much?)
There is no question that the Epsilon is a highly aggressive dual-use ICBM program that actually will fulfill three functions;
a) It’s stated purpose- to provide a low-cost, highly flexible alternative to the H-2A/B for Japan’s microsatellite and science community and ASNARO/ ODA-programs
b) A fast-flexible mobile launcher for military micro/nano/pico satellites at times of increased tension or the buildup or waging of war. In fact the SPRINT series in itself does a nice job building up a standard bus system for modular payloads, which will make them highly versatile for applications starting with medium resolution/ tactical spy satellites aka ASNARO. The SPRINT-A flight is in fact a test launch for upcoming deals with Vietnam and Cambodia to supply satellites as ODA (and to keep them out of China’s orbit- again literally!)
c) A family of boosters for said purposes (a) and (b) and also as an ICBM design for if/when Japan decide to weaponsize its supergrade / plutonium stocks.
I have also put the first article I published on the Epsilon, which was originally called the ASR here, FYI:
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