sentences:  Like other North Stars, they were notorious for the high level of cabin noise caused by the Merlin engines, as unlike the radials of the DC-4, the exhaust from the individual cylinders is not collected and exhausted via a single outlet, but instead exits the separate individual ejector-exhaust stubs in high-pressure bursts.In an effort to reduce cabin noise, the sole C-5 variant was powered by Pratt & Whitney R-2800 Double Wasp engines that were considerably quieter.The only C-5 was delivered to the RCAF in 1950, entering service with No.