REVISED: 8/21/08
Keystone, KeystoneLoeningAir Yacht 1932 = Improved KeystoneLoening K85; span: 47'6" length: 35'8". Keystone XB1B [27334] (USAF Museum) B1 1927 = 5p development of HuffDaland XHB1 with two 600hp Curtiss V15705; span: 85'0" length: 62'0" v(cruise): 117 range: 700 ceiling: 15,000'. Bomb load: 2500#. POP: 1 prototype as XB1B [27334] (B1A designation was assigned at the time to Bristol Fighter). Keystone B3A (USAF Museum) B3 1930 = LB10A with two 525hp P&W R1690; span: 74'8" length: 48'10" load: 5247# v: 114/98/56 range: 860. POP: 36 as B3A, plus 27 redesignated from LB10A [30281/343], of which 3 were modified as Y1B6. B4  Army bomber. New production of LB13. Y1B4 1930 = Redesignated from LB13. POP: 5 [30344/348]. B5  LB14 with two 525hp Wright R1750; span: 67'0" length: 45'0" load: 5247# v: 111/98/57 range: 815. Y1B5 1930 = Redesignated from LB14; 5 ordered, but none built. B6  Upgrade of LB13 with two 575hp Wright R1820. Y1B6 1930 = 575hp Wright R18201 and threebladed props. POP: 2 modified from LB13 [30349/350] and 3 from B3A contract [30351/353]. Keystone K47 [NX179] (Natl Archives via Kevin Burns) K47 Pathfinder 1927 = 12pO/CB; three 420hp Liberty 12; span: 67'0" length: 45'0" v: 100/x/60 range: 4200. Civil transport developed from HuffDaland LB5 taperwing, twintail bomber design. POP: 1 [NX179], repowered with 220hp Wright J5, for entry in the Orteig transatlantic race as American Legion (p: Noel Davis, Stanton Wooster); fatal crash on takeoff from Langley Field on 4/26/27. K47A 1927 (ATC 254) = Three 220hp Wright J5; span: (upper) 66'6" (lower) 75'0" length: 46'0" load: 4485# v: 113/95/46 range: 500. POP: 1 [NC1612]; went to PAA in 1928. Later with three 525hp Wright Cyclone; v: 150/x/55. K55 Pronto 1928 = 13pOB; 220hp Wright J5; span: 39'11" length: 26'9" load: 1310# v: 112/100/57 range: 500. $15,000. Combination mail and shorthaul passenger service, designed for "highaltitude service," assumably not in cold weather. Keystone K78 K78, 78D Patrician 1929 (ATC 260, 285, 2350, 2354) = 21pChwM; three 525hp Wright Cyclone; span: 86'5" length: 61'7" load: 6376# v: 148/120/60 range: 480550. $85,000; POP: 3; 1 K78 [NX7962], and 2 K78D [NX=NC98N, NC10N] with extensive design modifications. (2350) specific to [NC98N] in 1931 as a Wright Corp executive plane. Loadcarrying record set in 1929, in which it was reported that "33 girls, two pilots, and a mechanic were carried to 10,200' in 25 minutes"—a payload of 4600#. Keystone K84 [NC755W] (Frank Rezich coll) K84 Commuter 1932 (ATC 2526) = KeystoneLoening K84 with 300hp P&W Wasp Jr; span: 40'0" length: 32'0". K85 Air Yacht SEE KeystoneLoeing K85. LB1 1923 = Single and multiengine Army light bomber. From HuffDaland HB/LB1. LB class changed to B in 1930. XLB1 (HuffDaland) 1923 = 5pOB; two 410hp P&W R1340; span: 66'6" length: 47'4". POP: 1 prototype [231250]. HuffDaland LB3 [27333] Keystone XLB3A [27333] (USAF Museum) LB3, 3A 1927 = HuffDaland LB1 with two inverted Liberty V1410; span: 67'0" length: 44'8". POP: 1 [27333]. Repowered as XLB3A with P&W 410hp R1340 Wasps; span: 67'0" length: 45'0" load: 5617# v: 116/93/59 range: 544. Keystone LB5 With Douglas O2 (USAF Museum) LB5 1927 = Similar to HuffDaland XLB3A, but with two 420hp Liberty V1650 mounted on the lower wings, one large central and two small outboard rudders; v: 113/x/x. Bomb load: 2121#. POP: 1 prototype XLB5 [26208] and 10 production [27335, 344]. LB5A 1928 = Equal twin tails. POP: 25 [281/25]. Keystone XLB6 [27344] (USAF Museum) Keystone LB6 (USAF Museum) LB6 1928 = The final LB5 refitted with 74'9" straightchord wings, and engines suspended between the wings. POP: 1 prototype XLB6 [27344], crashed 6/10/29, after 171 hours of flight testing; 17 LB6 production models in 1929 with two 525hp Wright Cyclones [2911/27]; span: 74'9" length: 43'5" load: 6604# v: 114/95/58 range: 632 ceiling: 11,650'. Bomb load: 2200#. Keystone LB7 (USAF Museum) Keystone LB7 as NAR "racer" LB7 1929 = Two 525hp P&W R16903. POP: 18 [28388/395, 291/10], plus 3 modified from LB6 [2913/14, 16]. Keystone LB8 [299] (USAF Museum) LB8 1929 = LB7 converted to 550hp Wright GR1860; length: 42'6" load: 6388# v: 126/100/59. POP: 1 [299]. LB9 1929 = LB7 converted to 575hp Wright GR1750. POP: 1 [2910]. Keystone LB10 [2927] (Eugene Palmer coll) LB10 1929 = Modified from LB6. 525hp Wright R1750s, single rudder; span: 75'0" length: 49'3" load: 6292# v: 116/93/58 range: 350. POP: 1 [2927]. LB10A 1930 = P&W R1690s and single rudder. POP: 63 [30281/343], were redesignated first as B3A for delivery, then B5A. LB11, 11A 1930 = Wright R1750s. POP: 1 [2926], repowered with 525hp GR1750s as LB11A. Keystone LB12 [28388] (USAAF) LB12 1929 = Modified LB7 (originally as temporary XLB7) with 575hp P&W R1860s. POP: 1 as XLB12 [28388], redesignated LB12. Crashed 8/19/29. LB13 1930 = POP: 7, redesignated as Y1B4 and Y1B6. LB14  POP: 5 ordered as Y1B5, but not built. NK 1928  USN version of Pup. Keystone XNK1 [A7941] (USN via TKnL coll) O15 1928 = Army recon. 2pOB; 225hp Wright R790; span: 37'3" length: 27'1" v: 119. Gross wt: 2520#. POP: 1 as XO15 [28195]. OK 1930 = 2pOB; 400hp Wright R975; span: 34'8" length: 24'10" v: 143. Gross wt: 3175#. Based on BuAero design #86. POP: 1 as XOK1 [A8357]. Keystone PK1 (Gene Palmer coll) Keystone PK1 (USN via Clark Scott coll) PK 1930 = NAF PN12 variant with twin tails. POP: 18 as PK1 [A8507/8524]. Pup 1928 = 2pOB; 220hp Wright J5; span: 37'0" length: 26'6" v: 116/97/45 range: 375. POP: 1 for military evaluation. Keystone K84 [NC3541] Loening K84 Commuter 1929 (ATC 219, 2481) = 4pCBAm; 300330hp Wright J6; span: 36'0" (?>40'0") length: 32'5" load: 1223# v: 115/90/50 range: 440 ceiling: 12,000'. $16,800; POP: 31 [NC19E/22E, NC59K/61K, NC63K, NC301V, NC354V, NC374V/376V, NC535V, NC538V/540V, NC339W/341W, NS370N, NC755W/758W, NC762W/763W, NC9781, NC10247/10250], of which 1 was 2p with 365hp Wright R975 under (2481). Loening K84W 1930 (ATC 2526) = Conversion with 330hp P&W Wasp Jr. POP: 1 [NC374V]. Keystone K85 [NC3541] Loening K85 Air Yacht 1931 (ATC 395) = 8pCBAm; 525hp Wright Cyclone; span: 46'8" length: 37'2" load: 2091# v: 130/107/60 range: 500. Grover Loening. $28,700; POP: 2 [X769W, NC10588], repowered and upgraded from Loening C4C. Loening OL9 1934 = 2pOBAm; 450hp P&W R1340C4; span: 45'0" length: 34'9" v: 122 range: 625 ceiling: 14,300'. $18,750; POP: 26 [A8733/8747, A8979/8985, 9208/9211]. Loening O10 SEE Loening.
