Walter Bora
.jpg)
Walter Bora in the Kbely Aviation Museum
The Walter Bora is an aircraft engine from the Czechoslovak manufacturer Walter Motors as from 1933/1934.
construction
The air-cooled Neunzylinder- four-stroke - radial engine is made of steel liners with attached light metal cooling fins and bolted cylinder heads made of light metal. Each cylinder has two valves that are controlled by the cam disk via pushrods and rocker arms. The crankshaft is split and runs in two roller bearings and one axial ball bearing. In the Bora-R variant , the engine is equipped with a planetary gear with a ratio of 3: 2.
use
.jpg)
Technical specifications
| Parameter | Walter Bora I. | Walter Bora-R |
|---|---|---|
| drilling | 105 mm | |
| Hub | 120 mm | |
| Displacement | 9.4 l | |
| compression | 6.3 | |
| length | k. A. | k. A. |
| diameter | 1100 mm | |
| rated capacity | 200 hp (147 kW) at 2150 rpm | 235 hp (173 kW) at 2400 rpm |
| Full performance | 220 hp (162 kW) at 2300 rpm | 244 hp (179 kW) at 2600 rpm |
| Dry weight without hub |
165 kg | 172 kg |
| Power to weight ratio | 0.75 kg / hp | 0.7 kg / hp |
| Displacement | 23.5 hp / l | 26.1 hp / l |
literature
- Werner von Langsdorff : Handbook of aviation . Born in 1939. 2nd, unchanged edition. J. F. Lehmann, Munich 1937, p. 533 .
Web links
Commons : Walter Bora - collection of pictures, videos and audio files
Commons : Walter Bora II-R - collection of pictures, videos and audio files