Invincible D-D
Invincible Metal Furniture Co · United States · first flew 1929 · light aircraft
The Invincible D-D was a prototype three- or four-seat touring aircraft built in the United States in 1929. One example flew before development ended with the Great Depression.
Recognition (WEFT)
| W — Wings | Mid-mounted, straight |
|---|---|
| E — Engines | 1 × piston, nose-mounted |
| F — Fuselage | Triangular tailplane mounted on top of the fuselage with a quadrant-shaped fin |
| T — Tail | Conventional |
WEFT is AircraftIQ's four-point recognition method — how it works.
Spot it by:
- Rectangular plan, blunt-tipped mid-wing braced with steel V-struts in wooden fairings
- Nose-mounted radial engine with cylinders largely exposed
- Triangular tailplane mounted on top of the fuselage with a quadrant-shaped fin
A mid-wing cabin monoplane with fabric covering, a nose radial engine and a fixed tailwheel undercarriage.
Specifications
- The Invincible D-D has a length of 7.34 m (24 ft).
- It has a wingspan of 11.6 m (38 ft).
- Its maximum speed is 175 km/h (109 mph).
- Typical crew: 1.
Figures are for the representative variant described above; marks differ. See how AircraftIQ sources figures.
History
The designer was Irl Beach, and the first flight was in late January or early February 1929 at Manitowoc. It was designed to take either a 90 hp LeBlond radial or a 170 hp Curtiss Challenger.
Variants
The Challenger-powered version could carry four people and cost $7,800, against $5,500 for the LeBlond version.
Where you'll see it
It was scheduled to appear at the Detroit air show that April. Invincible left the aircraft industry in 1929.
Related aircraft
AircraftIQ — the aircraft field guide: 8,606 recognition guides, live overhead identification, works offline.