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Message: <blockquote data-quote="riggerrob" data-source="post: 333300" data-attributes="member: 8794">Re: Ca- 183bis<blockquote data-quote="Skybolt">I'll post complete data later, for now I only say that the gun on the engine was a 20 mm one like the other four, not a 30 mm. Lot of legends on this project, as you see. BTW, I'm not convinced that the DB-605 transmission shaft could even house a 30 mm caliber gun...</blockquote>————————————————————————————-Most motor-cannons operate completely outside the engine, ergo no need to worry about compatibility with the crankshaft. They will not fire through the middle of the crankshaft. Often they nestle into the V between cylinder banks.Instead, most motor-cannons only fire through the propeller speed reduction unit. Since the PSRU offsets the propeller from the crankshaft, the cannon barrel has no need to penetrate the crankcase. . Since the contra-rotating propellers needed a completely new PSRU it would be easy to specify a 30 or 37mm cannon - at the start of the project - and design the new PSRU around the larger cannon.</blockquote>