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Elmer Sperry developed the Stallemometer as a follow-on component to the first successful aircraft autopilot, demonstrated by Sperry in 1914. The Stallemometer detected a stall flutter and then function as a switch to drop the nose by twenty degrees through the autopilot until a stall recovery occurred. A light provided a further warning that the stall had occurred and a recovery was underway. Like the autopilot itself, the Stallemometer was not seen by aviators as a desirable innovation due to cost, weight, complexity and its subsuming of pilot control over the flight. Such systems did enjoy a resurgance fifty years later as increasing levels of autopilot autonomy became standard on larger transport aircraft.
- 1.5 inches diameter, 3.5 inches long; gray metal; streamlined, strut mount.
| Date | 1915 |
| Manufacturer | The Sperry Gyroscope Co. |
| Country of Origin | United States of America |
| Materials | Copper Alloys, Non-Magnetic Metal Alloy, Glass, Natural Fabric |
| Dimensions | Approximate (grey object): 5.1 × 59.7 × 8.3cm (2 × 23 1/2 × 3 1/4 in.) |
| Dimensions | Approximate (black object): 7 × 4.4 × 14cm (2 3/4 × 1 3/4 × 5 1/2 in.) |
| Credit Line | Gift of the Sperry Gyroscope Company |
| Inventory Number | A19300012000 |
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