Siemens & Halske Sh 14
The Siemens-Halske Sh 14 is an air-cooled seven-cylinder - radial engine of Siemens & Halske . It was developed in the 1920s for installation in training and training aircraft and went into production in 1928. The Sh 14 was used in aircraft such as the Bücker Bü 133 "Jungmeister", Focke-Wulf Fw 44 "Stieglitz", Udet U 12 "Flamingo", Heinkel He 72 and Klemm Kl 31 and Kl 32 .
Naming
After the aero engine manufacturing business was separated from the Siemens & Halske group into the newly created subsidiary Siemens Apparate und Maschinen GmbH (SAM) in 1933 , the Sh 14 A was also known as the SAM 314. From 1936 onwards, SAM engine production was relocated to the new Brandenburg engine works (Bramo) in Berlin-Spandau . As part of an expansion program, BMW took over Bramo in 1939. After that, the engine was referred to in the literature as Bramo Sh 14 or BMW-Bramo Sh 14 .
Today's meaning
The aircraft that were equipped with the Sh 14 are just as rare today as the engine itself. Therefore, when restoring historical aircraft, other engines with similar performance data are used today, as there are practically no Sh 14 engines on the free market Are available. Airplanes like the Focke-Wulf Stieglitz with original engines are therefore welcome guests at air shows today.
design type
The Sh 14 works on the 4-stroke principle . The cylinders are made of steel ; The cylinder heads and pistons are made of an aluminum alloy . The two valves per cylinder are controlled by a cam drum in the crankcase via push rods and rocker arms . The hollow crankshaft is made of several parts. The cast aluminum crankcase is made up of four parts. Are the two at the rear of the engine Bosch - magnetos for dual ignition and the two carburetors the Berlin company SUM .
Technical data Sh 14 A-4
Dimensions:
- Number of cylinders: 7
- Bore: 108 mm
- Stroke: 120 mm
- Stroke / bore: 1.11
- Cylinder displacement: 1.12 l
- Total displacement: 7.84 l (7.7 l for Sh 14 A)
- Compression ratio: 6.0 (5.3 at Sh 14 A)
Installation dimensions:
- Length, gr (without hub): 1008 mm
- Diameter, gr .: 936 mm
Fuel:
- Octane number : 80
- Fuel pressure 0.1-0.3 bar
Lubricant:
- Summer / winter: Aero-Shell medium or Stanavo 120
- Lubricant pressure: 2–4 bar
- Inlet temperature: 65 ° C
- Outlet temperature: 100 ° C
Weights:
- Dry weight: 135 kg
Power and consumption on the ground (Sh 14 A-4):
| Performance for | 5 minutes | 30 minutes | Duration |
|---|---|---|---|
| Power in hp | 160 | 145 | 128 |
| Speed in 1 / min | 2200 | 2140 | 2050 |
| Fuel consumption in g / PSh | 235 | 237 | 244 |
| Lubricant consumption in g / PSh | 3-12 | 3-12 | 3-12 |
Further key data:
- Firing order : 1-3-5-7-2-4-6
- Inlet valves per cylinder: 1
- Exhaust valves per cylinder: 1
- Reduction gear : no
- Direction of rotation of the crankshaft and the propeller: right / right
- Loader : no
- Propellers connection : Siemens bolt or Rupp -hub
- Max. Cylinder temperature: 250 ° C
- Max. Speed: 2800 / min
- Displacement : 20.40 hp / l
- Power-to-weight ratio : 0.84 kg / hp
- Piston Load: 0.25 PS / cm²
- Ignition timing adjustment : automatic centrifugal force adjustment
- Lubrication: dry sump lubrication
- Starter : compressed air
Attachments and spark plugs
| Carburetor | Igniter | Spark plugs | Starter | Feed pump | |
|---|---|---|---|---|---|
| Manufacturer | SUM | Bosch | Siemens | Bramo | DBU |
| Model | 438a and 439a | JF 7 ARS | 10 F 18 | KM 3 / 0.45 | |
| number | 2 | 2 | 2 per cyl. | 1 | 2 |
literature
- Airplane type book manual of the German aviation and accessories industry year 1939/40. (Reprint) ISBN 3-8112-0627-3 .
- Manual learn to fly! With appendices A. School, training, travel and multi-purpose aircraft B. The most important aircraft engines for school and training aircraft. Published and compiled with the assistance of the RLM 1941.
- Airplane Classic magazine , January 2009 issue
Web links
Individual evidence
- ^ Gersdorff Grasmann Schubert: German aviation, aircraft engines and jet engines. ISBN 3-7637-6107-1 .