Lots of good discussions and arguing on various sites over this. But, oddly, not much good, distilled data/info.

Scenario: two single-engine prop planes. Engine quit and seizes in one. Engines quits but prop rotates in the other. Everything else equal. Which has more drag?

Without generating more argument and opinion (yeah... like that will happen), can you post a link to a definitive source for an answer? And that will explain it without formulas that take up 7 pages. I'd like something that can be understood by a History major.