I have previously posted about my father, J. B. (Iain) Gunn-900 ( https://en.wikipedia.org/wiki/J._B._Gunn),
who discovered the Gunn Effect (when you put low voltage DC through Gallium Arsenide with specific impurities you get out very high frequency AC, otherwise known as Microwaves) and invented the Gunn diode (https://en.wikipedia.org/wiki/Gunn_diode
) which, among other things, led to the miniturization (sp?) of both police radar, and radar detectors.
But this time I will post about a more distant relative (my 4th cousin once removed), Horace Thomas Pentecost-153 (1909 - 1983) who invented one of the first (single person) "backpack helicopters" (There was a German version invented about the same time, the early 1940s). It was called the Hoppi Coptor (see https://en.wikipedia.org/wiki/Hoppi-Copter
). It flew well once airborne, but was a bit tricky to control, especially on takeoff and landing. Both the US and UK Military expressed interest, but did not adopt it.
His father, Horace Charles Pentecost, was born (in 1875) in Kent, England, where HIS father, Stephen Horace Pentecost, was a boiler engineer. The family emigrated to the US in 1882, arriving at Baltimore, and settling first in Minnesota where they (father and brothers) worked in the locomotive industry. In the 1901 census they had moved to Chautauqua, NY, and Horace C Pentecost is shown as "draftsman loco man" while his father and brothers are shown as "iron worker loco man".
Horace Thomas Pentecost went to University (possibly Purdue) and became an aeronautical engineer, working in the Seattle area in the 1940s. He was married 3 times and apparently had 4 children: Mike, Chuck, Judy, and Katie, born in the 1950s (but I cannot find formal sources).
It seems that he lost control of his Hoppi Copter company as a consequence of his divorce settlement with his first wife, Charlotte Winkler.