{{short description|Small gyroplane}} {{No footnotes|date=December 2021}} <!-- This article is a part of Wikipedia:WikiProject Aircraft. Please see Wikipedia:WikiProject Aircraft/page content for recommended layout. --> {{Infobox aircraft |name=J4B |image=Barnett J4B G-BWCW.jpg |caption=Barnett J4B G-BWCW autogyro at The Helicopter Museum, Weston-super-Mare, UK |type=Recreational autogyro |manufacturer=Homebuilt |national_origin=United States |designer=Jerry Barnett |first_flight= |introduction= |retired= |status= |primary_user= |more_users= |produced= |number_built= |variants= }} The '''Barnett J4B''' is a small gyroplane marketed in the United States by Barnett Rotorcraft for homebuilding. Originally flown as the '''J-3M''' with an open cockpit and fabric-covered sides, later versions have a fiberglass cockpit pod either partially or fully enclosing the pilot. Apart from the basic J4B, versions available in 2007 included the '''BRC540''' (two seats side-by-side) and J4B2 (two seats in tandem). <!-- ==Development== --> <!-- ==Operational history== -->
==Variants== ;J-3M :Original variant with {{convert|48.5|kW|hp|abbr=on}} Continental A65 engine.<ref name=":0">Taylor 1981, p. 121.</ref> ;J-4M :Improved J-3M with {{convert|63.5|kW|hp|abbr=on}} Continental C85 engine.<ref name=":0" /> ;J4B :Single-seat autogyro with 23 ft rotor. ;J4B-2 :Two-seat variant of the J4B with a 25ft 4in rotor.
==Specifications (typical J4B)== {{Aircraft specs |prime units? = imp
|crew=one pilot |length m=3.76 |length ft=12 |length in=4 |rot number=<!-- helicopters -->1 |rot dia m=<!-- helicopters -->6.10 |rot dia ft=<!-- helicopters -->23 |rot dia in=<!-- helicopters -->0 |height m=2.34 |height ft=7 |height in=8 |rot area sqm=29.2 |rot area sqft= |empty weight kg=240 |empty weight lb=530 |gross weight kg=400 |gross weight lb=880
|eng1 number=1 |eng1 name=Continental O-200 |eng1 kw=<!-- prop engines -->75 |eng1 hp=<!-- prop engines -->100
|max speed kmh=200 |max speed mph=125 }}
==References== ===Citations=== {{reflist}} ===Bibliography=== * {{cite book |last= Taylor |first= Michael J. H. |title=Jane's Encyclopedia of Aviation |year=1989 |publisher=Studio Editions |location=London |pages=121 }} * [https://web.archive.org/web/20070901144253/http://www.pra.org/index.php?module=article&view=61&lay_quiet=1 Popular Rotorcraft Association] (archived) ==External links== * [http://barnettrotorcraft.com Barnett Rotorcraft company website]
<!-- ==See also== -->
Category:1970s United States sport aircraft Category:Single-engined pusher autogyros