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((Short description|1936 airliner flying boat series by Douglas))
<!-- This article is a part of [[Wikipedia:WikiProject Aircraft]]. Please see [[Wikipedia:WikiProject Aircraft/page content]] for recommended layout. -->
((Multiple issues|
((more citations needed|date=January 2017))
((Missing information|Douglas HXD and/or HXD designation|date=January 2017))
))

{|((Infobox aircraft begin
 | name=DF-151
 | image=Douglas DF San Diego Air & Space Museum 3.jpg
 | caption=
))((Infobox aircraft type
 | type=commercial passenger flying-boat
 | national origin=[[United States]]
 | manufacturer=[[Douglas Aircraft Company]]
 | designer=
 | first flight=1936
 | introduced=1930s<ref name="BTS"/>
 | retired=
 | status=
 | primary user=
 | number built=4 (1 prototype, 3 production)
 | developed from= 
 | variants with their own articles=
))
|}

The '''Douglas DF''' was a commercial flying boat built by [[Douglas Aircraft Company]], first flown on 24 September 1936.

==Design and development==
The DF could accommodate 32 passengers, or 16 in sleeper cabins, and was the last flying boat built by the company.

Despite acceptable handling and performance within design specifications, no commercial orders were forthcoming and faced with no domestic market for aircraft already built, the company obtained export permits for them. The first two production aircraft were sold to [[Japan]], ostensibly for commercial airline use. The second aircraft was lost on a survey flight in 1938.  The second production pair were sold (as '''DF-195''''s) to the [[Soviet Union]] and after winterizing, were disassembled and transported to Russia via ship, where they were operated as transports by [[Aeroflot]].
<!-- ==Operational history== -->

==Variants==
;DF-151: Specification/designation of the first two aircraft sold to [[Japan]].
;DF-195: Specification/designation of the second two aircraft sold to the [[Soviet Union]].
<!-- ==Units using this aircraft/Operators (choose)== -->

==Specifications ==
((Aircraft specs
|ref=Jane's all the World's Aircraft 1937,<ref name=JAWA1937>((cite book |title=Jane's all the World's Aircraft 1937 |editor1-last=Grey |editor1-first=C.G. |year=1937 |publisher=Sampson Low, Marston & company, ltd |location=London |editor2-last=Bridgman|editor2-first=Leonard |pages=294c–295c))</ref> McDonnell Douglas aircraft since 1920 : Volume I,<ref name="Francillon">((cite book |last1=Francillon |first1=René J. |title=McDonnell Douglas aircraft since 1920 : Volume I |date=1988 |publisher=Naval Institute Press |location=London |isbn=0870214284 |pages=251–253))</ref> Biplanes, Triplanes, and Seaplanes,<ref name="BTS">((cite book |last= Sharpe |first= Michael |title= Biplanes, Triplanes, and Seaplanes |year=2000 |publisher=Friedman/Fairfax Books |location=London |pages= 162|isbn=1-58663-300-7))</ref> NICO BRAAS COLLECTION, No. 9317. Douglas DF-151<ref name="1000ACP">((cite web |url=http://1000aircraftphotos.com/Contributions/Braas/9317.htm|title= NICO BRAAS COLLECTION, No. 9317. Douglas DF-151|date=31 October 2009 |website=1000AircraftPhotos.com |access-date=10 April 2015))</ref>
|prime units?=imp
<!--
        General characteristics
-->
|crew=3 flight crew + cabin crew
|capacity=up to 32 passengers in four 8-seat compartments
|length ft=69
|length in=10.5625
|length note=
|span ft=95
|span in=
|span note=<br/>
*'''Hull beam:''' ((cvt|10|ft|3|in)) maximum
*'''Hull depth:'''  ((cvt|13|ft)) maximum
|height ft=24
|height in=6.25
|height note=
|wing area sqft=1295
|wing area note=<br/>
*'''Mean aerodynamic chord:'''  ((cvt|14|ft|7|in))
|aspect ratio=<!-- sailplanes -->
|airfoil=
|empty weight lb=16500
|empty weight note=
|gross weight lb=28500
|gross weight note=
|max takeoff weight lb=
|max takeoff weight note=
|fuel capacity=
|more general=
<!--
        Powerplant
-->
|eng1 number=2
|eng1 name=[[Wright SGR-1820G-2 Cyclone]]
|eng1 type=9-cylinder air-cooled radial piston engines
|eng1 hp=1000

|prop blade number=3->
|prop name=constant-speed propellers
|prop dia ft=<!-- propeller aircraft -->
|prop dia in=<!-- propeller aircraft -->
|prop dia note=
<!--
        Performance
-->
|max speed mph=167
|max speed note=at sea level
:::((cvt|178|mph|kn km/h)) at ((cvt|5000|ft))
|cruise speed mph=150
|cruise speed note=at 75% power at sea level
:::((cvt|156|mph|kn km/h)) at 75% power at ((cvt|5000|ft))
:::((cvt|164|mph|kn km/h)) at 75% power at ((cvt|9600|ft))
*'''Alighting speed:''' ((cvt|66|mph|kn km/h)) 
|stall speed mph=
|stall speed note=
|never exceed speed mph=
|never exceed speed note=
|minimum control speed mph=
|minimum control speed note=
|range miles=1500
|range note=with 32 passengers
:::((cvt|3300|mi|nmi km)) with 12 passengers
|combat range miles=
|combat range note=
|ferry range miles=
|ferry range note=
|endurance=<!-- if range unknown -->
|ceiling ft=14300
|ceiling note=<br/>
*'''Absolute ceiling:''' ((cvt|16400|ft))
|g limits=<!-- aerobatic -->
|roll rate=<!-- aerobatic -->
|climb rate ftmin=550
|climb rate note=at sea level
:::((cvt|585|ft/min|m/s)) at ((cvt|5000|ft))
|time to altitude=
|wing loading lb/sqft=22
|wing loading note=
|fuel consumption lb/mi=
|power/mass=((cvt|0.07|hp/lb|kW/kg))

|more performance=
|avionics=
))

==References==
((commons category|Douglas DF))
((Reflist))
<!--==Further reading==-->
<!--==External links==-->
((Douglas airliners))
((Japanese Navy short aircraft designations))

[[Category:Douglas aircraft|DF-151]]
[[Category:1930s United States airliners]]
[[Category:Aircraft first flown in 1936]]
[[Category:Twin piston-engined tractor aircraft]]

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