|Producer (type)||Pierre Levasseur, France|
|Propeller No.||SERIE 1597 N ?E(?)RO 37426|
|Engine||Wright 200 HP|
|Country of Origin||France|
About the propeller. Manufactured by the French company Pierre Levasseur (PL) the propeller was ordered by Polish company Plage – Laśkiewicz. Co-operation between both companies is undoubtful and well documented – in 1933/34 Plage – Laśkiewicz ordered also props for another prototype – Lublin R XX . Most likely the propeller was not used. For sure it stays a part of Polish unfinished aviation project.
Construction. The propeller lamination consists of 9 ash plies. Propeller coated by Tonkilaque. The outboard 780 mm (approx) of leading edge has aluminum sheathing.
Aircraft and Engine. The propeller was most likely designed to be powered by 9-cylinder radial engine WRIGHT WHIRLWIND J58 220 HP (not 200). Such an engine was produced by Skoda factory at Okęcie, Warsaw.
Cubic Capacity …………. ca 12,9 l
Weight ……………………. ca 227 (236) Kg
Compression Ratio …… 5,4
Specific consumption… 50 l/h.
The aircraft for which the propeller was destined for is unclear. Lublin R XXI prop dated 10 luty 1933 is well established among the other projects of Plage Laśkiewicz:
LUBLIN R XIX (1931) – prototype fitted with Rudlicki stabilizer (V tail).
LUBLIN R XX – a plane on the floats, with origins dating back to 19.04.1932.
LUBLIN R XXII – a plane for which initial information appears on January 1934.
The only information which can be obtain about Lublina RXXI is a brief A. Morgała, info:
„…Designed in 1934r. aircraft Lublin R-XXI was a developed derivative of Lublin R-XIII. The engine was different than the one used in predecessor: PZL G-1620B Mors II of 316 kW (430 HP) power. Similar to Lublin R-XXIII, it was featured with wheel fairings and Townend cowling of the engine. The prototype was not built finally, left as a paper design”
The major discrepancy concers the engine used and the engine’s power – the propeller adjusted to the approximetly double power had to be bigger. The second discrepancy concers the date: the tender for reconnaisence aircraft was announced in 1934. Therfore it is fairly possible that designation R XXI was used twice for different projects.
- Przemysł Lotniczy w Lublinie 1919 – 1939, Mariusz Wojciech Majewski, Wydawnictwo ZP 2009.