The Skyman was a 1940’s character, created by Gardner Fox and Whitney. The Skyman’s career began in Big Shot Comics #1 and ended in #101 (1949), four issues shy of the comic's last issue. Along the way the Skyman appeared in his own comic for six issues spread over several years, and also in issues of Sparky Watts and The Face.
In this early adventure, from Big Shot Comics #6 (1940), besides the barrel chest and giant arms, we see how the Skyman’s “Atom-atic” pistol works, that his plane will hover and wait for him while he swings through his girlfriend’s window to “scare her,” and about the cancer curing machine — the sole machine in existence — stolen by criminals.
Here's another early Skyman story I showed a few years ago. Just click the picture.