B-29 Development - 1933-1940
| Project Type No. | Engines | Wing Span ft. in. | Length ft. in. | Gross Wt. lb. | Wing Load lb./sq. ft. | Range with 2,000 lb. Bombs miles. | Maximum Speed | Max. Bomb Load lb. | ||
|---|---|---|---|---|---|---|---|---|---|---|
| MODEL 316 | Mar 1933 | 2,000 h.p. | Wright R-3350 | 157 0 | 109 2 | 89,900 | 31 | 4,000 | 245 m.p.h. @ 15,000 ft. | --- |
| MODEL 322 | Jun 1938 | 1,400 h.p. | Pratt & Whitney R2180 | 108 7 | 75 5 | 53,100 | 35 | 3,600 | 307 m.p.h. @ 25,000 ft. | 9,928 |
| MODEL 333 | Jan 26, 1939 | 1,150 h.p. | Allison 1710 | 109 0 | 80 8 | 48,600 | 34 | 3,420 | 307 m.p.h. @ 15,000ft. | 5,800 |
| MODEL 333A | Jan 27, 1939 | 1,150 h.p. | Allison 1710 | 108 6 | 80 8 | 48,600 | 34 | 3,000 | 328 m.p.h. @ 15,000ft. | 5,800 |
| MODEL 333B | Feb 21, 1939 | 1,850 h.p. | Wright 1800 | 111 0 | 80 8 | 52,180 | 34 | 2,500 | 364 m.p.h. @ 20,000ft. | 5,800 |
| MODEL 334 | Mar 4, 1939 | 1,850 h.p. | Pratt & Whitney 1800 | 120 0 | 83 4 | 66,000 | 40 | 4,500 | 390 m.p.h. @ 20,000ft. | 7,830 |
| MODEL 334A | Jul 1939 | 2,200 h.p. | Wright 3350 | 135 0 | 80 0 | 66,000 | 47 | 5,333 | 390 m.p.h. @ 16,000ft. | 7,830 |
| MODEL 341 | Aug 1939- Mar 1940 | 2,000 h.p. | Pratt & Whitney R-2800 | 124 7 | 85 6 | 85,672 | 64 | 7,000 | 405 m.p.h. @ 25,000ft. | 10,000 |
| MODEL 345 | Mar-Apr, 1940 | 2,200 h.p. | Wright R-3350 | 141 3 | 93 0 | 112,300 | 65 | 6,950 | 382 m.p.h. @ 25,000ft. | 16,000 |
| XB-29 | Jun 1940- Feb 1942 | 2,200 h.p. | Wright R-3350 | 141 3 | 98 2 | 114,500 | 66 | 5,333 | 382 m.p.h. @ 25,000ft. | 20,000 |
| B-29 | Jul 1943 | 2,200 h.p. | Wright R-3350 | 141 3 | 99 0 | 135,000 | 77 | ... | Over 350 m.p.h. | 20,000 |
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