FarSight said:Therefore whole Himmelsturmer case seems to be standing on firm ground... :
Well, a patent in advance for the time but without operational application or any subsequent research or development attempt in this field in the ussr by other engineers?In the twenties in the USSR,an engineer named Alexander Fedorovich Andreev applied for a jetpack patent.https://sudonull.com/post/11882-Engineers-jetpack-Alexander-Fedorovich-Andreev