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<!-- This article is a part of [[Wikipedia:WikiProject Aircraft]]. Please see [[Wikipedia:WikiProject Aircraft/page content]] for recommended layout. -->
((refimprove|date=September 2022))
{|((Infobox Aircraft Begin
  |name = CL.I
  |image = 
  |caption = 
))((Infobox Aircraft Type
  |type = Escort Fighter/Ground Attack Aircraft
  |manufacturer = Bayerische Flugzeugwerke (BFW)
  |designer = 
  |first flight = April 1918 (CL.I)<br />July 1918 (CL.II)
  |introduced = 
  |introduction= <!--date the aircraft will enter military or revenue service, if the aircraft is still in development -->
  |retired = <!--date the aircraft left military or revenue service. If vague or multiples, it probably should be skipped-->
  |status = 
  |primary user = [[Luftstreitkräfte|Imperial German Army Air Service]] 
  |more users = <!--limited to three "more users" total. please separate with <br/>-->
  |produced = 
  |number built = 2 × CL.I/CL.II, 1 × CL.III
  |unit cost = 
  |developed from = <!-- the aircraft which formed the basis for the topic type -->
  |variants with their own articles = <!-- variants OF the topic type -->
))
|}

The '''BFW CL.I''' was a prototype German escort fighter aircraft of World War I.

==Design and development==
The CL.I first flew April 1918, but was considered to be inferior in performance to the Hannover CL.V. Thus, improvements were made and the aircraft was returned to BFW, fitted with a lighter fuselage and redesignated '''CL.Ia'''. Results of tests performed on 14 September 1918 were declared unsatisfactory. BFW commenced a redesign of the CL.Ia to produce an entirely new aircraft, the '''CL.III''', of which a single prototype was built but not flown due to the Armistice of November 1918. A further development of the BFW CL.III, the '''CL.IV''', remained a paper project only.

The second CL.I prototype (known as '''Type 18''' by BFW) was fitted with a ((cvt|175|hp)) [[MAN Mana III]] six-cylinder in-line engine and designated '''CL.II''', with test flights in July 1918. 

==Variants==
; CL.I: (company designation '''BFW type 17''') the initial design; two built
; CL.Ia: with lighter fuselage; one converted from a CL.I
; CL.II: (company designation '''BFW type 18''') one of the CL.Is fitted with a ((cvt|175|hp)) [[MAN Mana III]] engine
; CL.III: Re-design of the CL.Ia; one built.
; CL.IV: further development not completed before the armistice.

==Specifications (CL.Ia)==
((Aircraft specs
|ref= 
|prime units?=met
<!--
        General characteristics
-->
|crew=2
|length m=7.81
|span m=10.62
|height m=
|wing area sqm=
|aspect ratio=<!-- sailplanes -->
|airfoil=
|empty weight kg=720
|empty weight lb=
|empty weight note=
|gross weight kg=1060
|gross weight lb=
|gross weight note=
|max takeoff weight kg=
|max takeoff weight lb=
|max takeoff weight note=
|fuel capacity=
|more general=
<!--
        Powerplant
-->
|eng1 number=1
|eng1 name=[[Mercedes D.III]]
|eng1 type=6-cylinder water-cooled in-line piston engine
|eng1 hp=160

|prop blade number=<!-- propeller aircraft -->
|prop name=
|prop dia m=<!-- propeller aircraft -->
|prop dia ft=<!-- propeller aircraft -->
|prop dia in=<!-- propeller aircraft -->
|prop dia note=
<!--
        Performance
-->
|max speed kmh=
|max speed note=
|cruise speed kmh=
|cruise speed mph=
|cruise speed kts=
|cruise speed note=
|stall speed kmh=
|stall speed mph=
|stall speed kts=
|stall speed note=
|never exceed speed kmh=
|never exceed speed mph=
|never exceed speed kts=
|never exceed speed note=
|range km=
|range miles=
|range nmi=
|range note=
|combat range km=
|combat range miles=
|combat range nmi=
|combat range note=
|ferry range km=
|ferry range miles=
|ferry range nmi=
|ferry range note=
|endurance=
|ceiling m=
|ceiling note=
|g limits=<!-- aerobatic -->
|roll rate=<!-- aerobatic -->
|climb rate ms=
|climb rate ftmin=
|climb rate note=
|time to altitude=((convert|1000|m|abbr=on)) in 2 minutes; ((convert|4000|m|abbr=on)) in 6.5 minutes
|wing loading kg/m2=
|wing loading note=
|fuel consumption kg/km=
|fuel consumption lb/mi=
|power/mass=

|more performance=
<!--
        Armament
-->
|guns=<br />
:: 1-2 × ((convert|7.92|mm|abbr=on|3)) [[MG 08|LMG 08/15 "Spandau"]] machine gun, synchronized
:: 1 × ((convert|7.92|mm|abbr=on|3)) [[Parabellum MG14]] machine gun, on ring mount for observer
|bombs=
))

==References==
((reflist))
* William Green and Gordon Swanborough; ''The Complete Book of Fighters'', Salamander, 1994. p. 62 ((ISBN|1-85833-777-1)).

((Messerschmitt aircraft))
((Idflieg C-class designations))
((Authority control))

[[Category:BFW aircraft|CL.I]]
[[Category:Aircraft first flown in 1918]]
[[Category:Biplanes]]
[[Category:1910s German attack aircraft]]
[[Category:1910s German fighter aircraft]]
[[Category:Military aircraft of World War I]]
[[Category:Single-engined tractor aircraft]]

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