JMIA completed the CFRP monocoque for F4.
http://www.jmia.info/news/ns091121.html
Presentation material of JMIA monocoque(in Japanese)
http://www.jmia.info/img/jmiauova1122.pdf
JMIA say
The cost of manufacturing is cheap.
F3 monocoque: 3.5 million yen.
FCJ(Formula challenge Japan) monocoque: 2 million yen.
F4 aluminum honeycomb monocoque: 1.35 million yen.
JMIA monocoque: 1.4 million yen.
It is easy to judge whether it is a defect.
It is excellent in durability.
It is excellent in generality.
The safety test in accordance with FIA/F3 regulations is scheduled to be done.
It is a photograph of the wind tunnel experiment of F4.
http://www.jmia.info/news/ns091121b.html
Presentation material for F4 participant.
http://www.jmia.info/img/f4091121.pdf
Present F4 vehicle(West racing cars)
http://www.west-racing.co.jp/catlog/west096.html
http://www.west-racing.co.jp/west096report.html