The mook from 1990 is orientated to EP helicopter. So full review for the Kalt whisper, Kyosho concept EP and Tobuzo EH-650. There is also the "keyence gyrosaucer" i think it is the first commercial quadcopter released in the world market during 1991.
The second book is about Gp helicopter of second mid of '80. So lots of technique and review of the best helicopter of that time. There is the Hirobo Shuttle, Kalt Baron 20, 60 and many more.
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