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liberyl12

7 photos tagged liberyl12, from 1 member of Flickr Commons.

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Related tags

Tags that often appear on the same photos:

• airmail
• aviation
• airmailpioneers
• dh4
• aircraft
• airplane
• biplane
• airlines
• airliners
• mailplane
• libertyengine
• liberty12
• prototype
• boeing40
• boeing
• boeingmodel40
• model40
• boeingb40
• b40
• douglasaircraftcompany
• douglasaircraft
• douglas
• dac
• elko

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• SDASM Archives 7 photos

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Here’s a selection of the conversations happening on these photos:

AL13_Air Mail Pioneers Photo_000131

from SDASM Archives

• dan_inbox said:

  Douglas DAM-1 (aka M-1) Douglas Air Mail No 1.

AL13_Air Mail Pioneers Photo_000094

from SDASM Archives

• embarrassed squirrel said:

  Modified Model 40.

• TVL1970 said:

  This is the first Boeing Model 40 as originally powered by the (US Government-specified) Liberty L-12 engine.

AL13_Air Mail Pioneers Photo_000070

from SDASM Archives

• embarrassed squirrel said:

  Modified Model 40.

• TVL1970 said:

  This is a (relatively rare) photo of the original Boeing Model 40 powered by a (by 1925, heavy and inefficient) Liberty Engine - as specified by the US government, which had hundreds of surplus Liberty L-12 engines from World War I production. The aircraft was designed and built to compete for US Post Office Air Mail service contract for 50 aircraft. Ultimately, the Douglas M-2 would get the contract. However, an improved Boeing Model 40, the Boeing Model 40A, would provide the impetus for the development and production of the Pratt & Whitney Wasp radial engine, as well as representing Boeing's start in building airliners. See: www.avsim.com/pages/0809/GAS/B40.htm en.wikipedia.org/wiki/Boeing_Model_40