Website of the Antique Airplane Association and the Airpower Museum Last Update: Jun 21 2019

1929 Monoprep

Registration: NC179K
S/N: 6077


Here is an account of the Monoprep from one of its previous owners, Walter Konantz.

I bought the Monoprep in May of 1940 while still a senior in high school, paying $400 for it.

In looking through the log books it showed that Martin and Osa Johnson, the noted African explorers and photographers, had learned to fly in this Monoprep at the Chanute, KS airport in the early 1930s.

I flew the Monoprep until late January 1943. Since I had been called up to enter the USAAF cadet program Feb. 1, I stored the airplane in my fathers four car garage with the long 32 foot wing lying across the back of the garage and the fuselage sitting on the landing gear in one of the car stalls.

A few months after my departure for the USAAF, my father sold the plane to Louis Watson at the Pittsburg, KS airport. He modified it by building up the turtle back so it met the wing trailing edge and closed in the cockpit, making it a hybrid Monocoupe.

A few years later it was purchased by a druggist in Lawrence, KS where started a complete restoration to return it to its original configuration. My son was attending college at Kansas University in Lawrence and on visits to see my son, I always dropped by the new owners garage to check on the restoration process. The last time I saw it, in 1968, it was recovered, painted, engine overhauled and painted like new, and lacked only a propellor and hooking up the instruments and engine controls to make it ready to fly.

The next word I heard a few years later was that the druggist had donated it to the APM, still having never been flown. It was farmed out to George Heflinger in Kansas City, KS for completion but he died before finishing it. Shortly after his death, it was moved to Blakesburg and was assembled for static display.

At the 1999 Antique fly-in a group of volunteers worked on it from dawn to dusk during the fly-in and it flew again for the first time in 58 years.

Our thanks to Walter for his account of owning the Monoprep, and some of its history. When the Monoprep took to the air again in 1999, at the controls was Daren Banfield (AAA M-21681), Aviation Director of the Owls Head Transportation Museum, Owls Head, Maine.



Length: 21' 0"

Height: 6' 3"

Wing Span: 32' 0" (Clark "Y" Airfoil)

Wing Chord: 60"

Weights and Capacities

Empty Weight: 783 Pounds
Payload (with 15 gallons fuel): 250 pounds


Maximum Speed: 99 MPH

Cruise Speed: 80 MPH

Landing Speed: 37 MPH

Rate of Climb: 680 ft/min. (Sea Level)

Ceiling: 9000 ft.
Range (at 4 Gal/Hr): 290 Miles


Original Price, Factory: $2,675