The Cometeers by Jack Williamson:
Science Fiction Inventions, Technology and Ideas
I have to go with the blurb from a 1967 paperback version:
"a spaceship twelve million miles long, the secret weapon that controls the Universe, a superhuman traitor to all mankind and, defying mortal peril, fantastic dangers, and the dread powers of the invincible Cometeers, the grandest trio of swashbucklers in all of science fiction - Jay Kalam, Hal Samdu and the incomparable Giles Habibula!"
'Nuff said. Select
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