The Maybach Mb.IV, originally designated Maybach HS, (only related to the Mb IVa by layout and size), was a six cylinder in-line piston engine of 250 hp (190 kW) output, originally developed for use in airships.

It was also used for large aircraft such as the Zeppelin-Lindau Rs.I giant seaplane.

Variants of the original HS engine included the Maybach HS D and Maybach HS Lu

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