On the top of page 968 he says "The moving vehicle pushes the soft compressible porous mat, which is deformed with a slope of α" which is not correct according to Fig. 2. He means "a slope of minus tan α" surely. Still, this looks to me like one of his better papers, or least bad anyway.
His conclusion "We suggest a concept of the flying vehicles, which might be found applications in the near future" seems a bit far-fetched.