Pratt & Whitney R-985

Pratt & Whitney R-985 Wasp Junior
Un Pratt & Whitney R-985 Wasp Junior
Descrizione generale
CostruttorePratt & Whitney
Tipomotore radiale
Numero di cilindri9
Alimentazione1 carburatore Stromberg
Schema impianto
Cilindrata16,17 L (985,75 in³)
Alesaggio132 mm (5316 in)
Corsa132 mm (5316 in)
DistribuzioneOHV 2 valvole per cilindro
Combustione
Combustibilebenzina 80 ottani
Raffreddamentoad aria
Uscita
Potenza450 hp (335 kW)
Dimensioni
Lunghezza1.056 mm (41,59 in)
Altezza1.162 mm (45,75 in)
Rapporti di compressione
Rap. di compressione6,0:1
Peso
A vuoto313 kg (690 lb)
voci di motori presenti su Wikipedia
Una visione frontale di un R-985 Wasp Junior installato su un Boeing-Stearman PT-17, Modell E 75 (OE-AWW)

Il Pratt & Whitney R-985 Wasp Junior era un motore aeronautico radiale a 9 cilindri sistemati su una singola stella la cui cubatura, 985 espressi in pollici cubi, è quella che le diede la sua denominazione ufficiale. Realizzato dalla Pratt & Whitney per dotarsi di un motore nella fascia più bassa di potenza, quella dai 300 ai 400 hp, venne utilizzato in molti velivoli leggeri di costruzione statunitense dal 1930 in poi, anche grazie alla sua riconosciuta affidabilità. Derivato direttamente dall'R-1340 Wasp, di cui è sostanzialmente una versione leggermente ridotta, è stato il secondo motore prodotto dalla Pratt & Whitney e della famosa serie Wasp. Il suo sviluppo lo portò in molte versioni a sviluppare fino a 450 hp.

Versioni

  • R-985-AN-4: 450 hp (336 kW)
  • R-985-AN-5: 450 hp (336 kW)
  • R-985-25: 450 hp (336 kW)
  • R-985-48: 450 hp (336 kW)

Velivoli utilizzatori

Canada (bandiera) Canada
Polonia (bandiera) Polonia
Regno Unito (bandiera) Regno Unito
Stati Uniti
Svizzera (bandiera) Svizzera

Altri progetti

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