Viktor Stepanovich Grebennikov was a Russian scientist, naturalist and entomologist who claimed to have invented a levitation platform which operated by virtue of insect body parts attached to the underside. Grebennikov wrote detailed accounts of his 1988 discovery, which involved an accident whilst examining chitin shells. He also wrote of his experiencies flying over the Russian countryside.
Although popular with many readers who dream of unpowered human flight, Grebennikov's work is criticized by scientists. His reports are suspiciously devoid of conclusive proof or public demonstration. He claimed that his camera shutter was jammed during the flights due to a time-warping force-field generated by the secret geometric power of chitin. - Wikipedia
For many people and scientists in Russia, Grebennikov was well known as the discoverer of the cavity structure effect (CSE). But few are acquainted with his greatest discovery, derived from the nature's precious secrets. In 1988 he found antigravitational effects of chitinous covering some insect species. The most astonishing phenomenon associated with antigravity was the partial invisibility or deformed visula perception of the material object in the antigravitational zone. In 1988 Grebennikov discovered biological antigravitation based on the effect of cavity structures, effectively De Broglie wave resonances produced by volumetric resonators of certain biological objects. Based on this discovery and by using bionic principles, Grebennikov designed and built an antigravitational platform in 1991 and developed manned flight up to 25 km/min.