It looks clean now, but when the 1932 Mona Coupe 110 is flown, it gets covered in grease. It requires oil before each flight and the push rods must be greased every 20 hours.

The Mona Coupe 110 was a popular racing plane, capable of flying 170 miles per hour. It’s claim to fame was a closed cockpit that allowed pilots to smoke a cigarette en route. It was later modified with a bigger engine and shorter wings and called the Mona Coupe 110 Special, which you can view at the Dakota Air Territory Museum.