this post was submitted on 14 May 2025
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Airplane mufflers have random outlet pipes on the side like that. It's for cabin heat.
No shit; most single-engine piston planes take heat for the cabin (and carburetor heat) from a shroud wrapped around the muffler. Which is why those little pill-in-a-card carbon monoxide detectors are common in pilot supply catalogs like Sporty's, the thin steel wall that separates cabin air from raw exhaust gases is in a place that is damn near impossible to fully inspect.
Twin engine piston planes are even dumber. It is impractical to run an air duct all the way from the nacelle to the fuselage, so instead they put a gas heater in the nose. Yeah. A heater. That burns leaded aviation gasoline. For cabin heat. They splode sometimes.
That's how the heater of a Cessna Skyhawk made TODAY works. It's also a lot more common to find an airplane that has been in service for 50 years.
The 172 was in production from the mid 1950's to 1986, and then they resumed production in 1996 to the present day. It is my understanding that the modern Skyhawk is technically a different aircraft, different type certificate and few interchangeable parts, but it's still the Toyota Corolla of airplanes.