 If you liked
Space Pirate Captain Herlock: Outside Legend - The Endless Odyssey
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 ...then you might like
Hakugei Densetsu
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Along with the original Space Pirate Captain Harlock (1978) this anime has a similar feel. A quirky, endearing crew centered around a heroic, manly captain. Coming of age stories of young kids. Pirates and spaceships! I also believe Ahab's costume design is based off Harlock or other Leiji designs. There are also similar story elements (best friend is the dead head mechanic, captain becomes the foster father).