Could Germany have used a large Zeppelin force to bomb the Grand Fleet in harbor?
Short answerProbably not: airships carried limited bomb loads, could not deliver torpedoes from operating altitude, gave hours of warning, and would have faced aircraft and anti-aircraft defenses around Scapa Flow.
NotesZeppelin raids had a powerful terror effect on undefended civilians, but a prepared naval base presented a different problem. A contemporary Hull report records two Zeppelins in the North Sea at 7:25 and one over the city at 11:47, where it dropped 32 bombs. The interval illustrates both the limited bomb load and the long warning available before an airship reached its target. Scapa Flow had three-inch anti-aircraft guns and aircraft that could launch from seaplane carriers. A large German airship buildup would also have prompted a British countermeasure programme, so the comparison cannot assume a passive Grand Fleet.