A couple of months ago, NHK broadcast a show that revealed that a Japanese team was building a streamliner to compete at the WHPSC in Battle Mountain this fall. The show, SUGOWAZA (roughly translated as “supreme engineering skills”) was a weird hybrid of an educational feature about engineering, and a reality show that featured a race between the Japanese team and Team Cygnus.

The show was broadcast in North America on Japan TV this past weekend. What follows is a capsule summary. I will note that my Japanese is rudimentary, and so I was only catching about 25% of what was being said. Any errors of interpretation are entirely my fault.
The show started with a backgrounder on streamliner racing at Battle Mountain. I am only speculating, but it would seem that when “Team Japan” was being assembled, the producers took their cues from bikes like Velox 1 since they separated the project into three aspects: the rider, the bike, and the cowl (fairing).

This is the graphic introducing the team.

The rider (left) is Ryohei Komori, a pro rider who appears to be a time trialist.

The frame designer (centre) is someone named Ikegami who has designed motorcycles for Yamaha, and also was part of a team that won the World Solar Car Challenge.
The shell designer (right) is a junior engineer that works for Toray Carbon Magic, and is part of a team that has made carbon aero bodies for race cars.
The next sequence introduced Team Cygnus. There is some footage of them taken in the Netherlands.

Thomas and Jan Marcel looking very seriously at a laptop.

The premise for the competition is a race at a test track in Japan. It is 5.5 km a lap, and the bikes would be timed over 200 m after about a lap and a half. Jan Marcel is quoted as saying that he would think that this would result in at least 20 kph less than Battle Mountain.

Team Cygnus was shown at the test track, unveiling their bike.

Then, there was a fun sequence where the host got into the bike and had the hatch lowered onto him which made him feel very uncomfortable to the merriment of all others present.

Team Cygnus was also asked how many years it took them to get to their best speed of 125 kph. They said seven years, and the aspect of the contest that was emphasized was to see if Team Japan could get to that level with a bike built from start to finish in four months (although it must be noted with significant resources behind them).
There was a short sequence showing the first time Komori rode a recumbent (not successfully), and then the show turned to a summary  of the frame build.
There was an illustration of the tradeoff between fork angle and having the rider’s leg not hit the mid drive. There was also a quick note about head tube angle and speed induced shimmy, but the discussion seemed a bit cursory.

Then there was a demonstration of the rider on the bike without shell, showing that he was faster than on his regular bike.

Then there were a lot of shots showing the cowl designer in front of a terminal showing CFD simulations, with dramatic music added to attempt to keep the viewer from losing interest. The final shape resulted in their modeling predicting a top speed of 132 kph. Again, there some simplified technical discussion of how a small tweak in the shape near the tail improved the top speed.

This was followed by some shots of a smooth shell being popped out of a mold by some technicians (must be nice).
Finally it was race day. Each team would get two attempts.
Team Cygnus went out first and achieved a speed of 93.38 kph through the traps. Apparently the wind was gusting up to 3 meters per second (which was about double the legal limit at the WHPSC) making handling a bit dicey.  Certainly Jan Marcel was weaving more than he would at Battle Mountain.  The first Japanese run was a bit slower.
Jan Marcel didn’t get a clean launch for the second run, and their fairing was scratched. They ended up going fractionally slower. Finally during the second run, the Japanese team went just a bit faster (93.69 kph) and there was much rejoicing.

How fast will Team Japan go at Battle Mountain? The bike has some similarities with Team Policumbent’s Pulsar which went 72 mph last year. Komori seems like quite a strong rider, and so we might expect a similar level of speed. Could they get to 75 mph? Their design goal of 132 kph (82 mph) seems a bit out of reach. There are some things that can be improved with the Japanese bike. Firstly it was pointed out during the show that the seam around the windshield could cause significant drag.

You can also see the horizontal seam on the body, and the untaped Dzus fasteners; OK for a race car with hundreds of horsepower, but for a human powered streamliner, not so much.

There were also no internal wheel covers, and at least from the front view, the fairing around the wheel openings seemed very wide.

Finally, the flat sides would make the bike rather sensitive to cross winds.
Nevertheless, it will be very exciting to how the Japanese team does this September. Wishing them every success (and also wishing that Jan Marcel gets his 80 mph hat).
Update: I’ve been informed that they will build a different bike for Battle Mountain. Here is a picture of Ikegami in front of a particular storage locker in California…..


photos: Al Krause
Update #2: Â thanks to the NHK for sending me a DVD copy of the program!

Update #3: some notes on the program from the CFD software firm.
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