Douglas XB-22

Douglas XB-22
Descrizione
Tipobombardiere medio
Equipaggio6
CostruttoreStati Uniti (bandiera) Douglas
Data primo volomai
Esemplarinessuno
Sviluppato dalDouglas B-18 Bolo
Altre variantiDouglas B-23 Dragon
Dimensioni e pesi
Lunghezza17,6 m (57 ft 10 in)
Apertura alare27,3 m (89 ft 6 1n)
Altezza4,6 m (15 ft 2 in)
Superficie alare89,1 m² (959 ft²)
Carico alare113 kg/m² (23,1 lb/ft²)
Peso a vuoto7 400 kg (16 331 lb)
Peso carico10 030 kg (22 123 lb)
Peso max al decollo12 600 kg (27 500 lb)
Propulsione
Motore2 radiali Wright R-2600-1
Potenza1 600 hp (1 194 kW) ciascuno
Armamento
Mitragliatrici3 Browning M1919 calibro 7,62 mm (.30 in)
Bombefino a circa 2 200 kg (4 500 lb)
Rapporto peso/potenza0,14 hp/lb (240 W/kg)
voci di aerei militari presenti su Wikipedia
Il Douglas B-18 Bolo, bombardiere dal quale fu sviluppato il Douglas XB-22.

Il Douglas XB-22 era un bombardiere medio bimotore ad ala bassa sviluppato dall'azienda statunitense Douglas Aircraft Company negli anni trenta e e rimasto allo stadio progettuale.

Derivato dal precedente pari ruolo B-18 Bolo, fu uno sviluppo intermedio non avviato alla produzione ma che determinò la realizzazione del B-23 Dragon.[1]

Storia del progetto

Dopo aver realizzato il B-18 Bolo, sviluppato su una specifica dell'United States Army e che ebbe come concorrente diretto il Boeing B-17 Flying Fortress, il favore riscontrato dall'US Army per quest'ultimo spinse la Douglas a considerare un programma di sviluppo al fine di migliorare le prestazioni complessive del proprio modello. Il progetto incorporava numerose modifiche tra le quali l'adozione di un impianto motore più potente, sostituendo gli originali radiali Wright R-1820 a 9 cilindri singola stella da 1 000 hp (746 kW) ciascuno con una coppia di Wright R-2600-1 14 cilindri doppia stella da 1 600 hp (1 194 kW).

Al termine delle modifiche il progetto originale era così variato che al modello venne assegnata la nuova designazione XB-22. Le migliorie però non risultarono del tutto soddisfacenti e benché l'United States Army Air Corps (USAAC), dopo aver visionato le specifiche del progetto, si fosse dichiarata interessata indicò una serie di modifiche da apportare al modello di produzione in serie, indicato con la nuova designazione B-23 Dragon.

Tecnica

L'aspetto dell'XB-22 risultava molto simile al modello da cui derivava, bimotore ad ala bassa e di costruzione interamente metallica, la cui differenza più evidente era l'adozione della coppia di radiali R-2600 inseriti in diverse gondole dalle dimensioni maggiorate e chiuse da cappottature NACA.

Utilizzatori

  Stati Uniti

Note

  1. ^ Douglas XB-22 in National Museum of the USAF.

Bibliografia

  • (EN) David Mondey, The Hamlyn Concise Guide to American Aircraft of World War II, Reprinted, London, Chancellor Press, 2002 [1982], ISBN 1-85152-706-0.

Collegamenti esterni

  Portale Aviazione

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