{{Short description|Turbine aircraft engine}} <!-- This article is a part of Wikipedia:WikiProject Aircraft. Please see Wikipedia:WikiProject Aircraft/page content for recommended layout. --> {{Use dmy dates|date=August 2017}} {{Use British English|date=August 2017}} {{infobox aero engine |name= RR300 |image= Rolls-Royce RR300 heliexpo2007.jpg |caption= The RR300 was unveiled at Heli-Expo 2007. |engine_type= Turboshaft |national_origin = |manufacturer = Rolls-Royce North America |first_run= |major_applications= Robinson R66 |number_built = |developed_from = Rolls-Royce Model 250 |developed_into = |variants_with_their_own_articles = }}
The '''Rolls-Royce RR300''' is a turbine aircraft engine (turboshaft/turboprop) developed for the light helicopter/general aviation market. Rated at up to 300 shp (224 kW) at take-off power, the RR300 is a rebadged and downrated variant of the Rolls-Royce Model 250-C20.<ref>{{cite web |url=http://www.indystar.com/apps/pbcs.dll/article?AID=/20070308/BUSINESS/703080398/-1/ZONES04 |title=Small engines buoy Rolls-Royce |publisher=Indianapolis Star |archiveurl=https://web.archive.org/web/20070313020903/http://www.indystar.com/apps/pbcs.dll/article?AID=%2F20070308%2FBUSINESS%2F703080398%2F-1%2FZONES04 |archivedate=13 March 2007 |url-status=dead |df=dmy-all }}</ref>
== Design and development == The Model 250-C18 certified in 1965 was rated at a similar power level to that of the RR300, but over the last forty years subsequent sub-models have become more efficient and produce substantially more power. For instance the Model 250-C40, with an overall pressure ratio of 9.2:1 at an airflow 6.1 lb/s, develops 715 shp.
The RR300 mates a scaled-down centrifugal compressor from the Model 250-C40/47 to a combustor and turbine similar to that of the Model 250-C20, replacing the C20's complex six-stage axial/single-stage centrifugal compressor. The RR300 retains the look and layout of the Model 250 from which it is derived.<ref name=TCDS>[http://rgl.faa.gov/Regulatory_and_Guidance_Library/rgMakeModel.nsf/0/54c499656ba5570b862575b4004d8d65/$FILE/E4CE.pdf FAA TCDS]</ref>
The RR300 is the second attempt to develop a lower-rated version of the Model 250, coming 20 years after the 350 shp Allison Model 225 of 1987.<ref name=TCDS/>
The five-seat Robinson R66 light helicopter features the RR300 as a turboshaft engine, Robinson having originally intended on utilizing the standard Model 250-C20. Rolls-Royce has also announced the signing of Memorandums of Understanding with Enstrom, MD Helicopters, RotorWay and Schweizer to discuss future applications of the RR300. In March 2013, the engine was named as the power plant for the new Scott's Bell 47GT-6. The 47GT-6 will be based upon the 47G-3B-2A type design and produced by Scott's Bell 47, the current holder of the Bell 47 type certificate.<ref>{{cite web|url=http://www.scottsbell47.com/news.html#transfer|title=The Bell 47 TC is ceremoniously transferred to SB47}}</ref>
FAA type certification for the RR300 was achieved in February 2008.<ref name=FAA_cert>{{cite web| url=http://www.rolls-royce.com/news/press_releases/2008/rr_awarded_faa_certification.jsp | publisher=Rolls-Royce| title=Rolls-Royce awarded FAA Certification for RR300 engine ahead of schedule |date=24 February 2008 |accessdate=14 July 2011}}</ref>
==Applications== * Robinson R66 * RotorWay 300T Eagle (Planned, apparently canceled) * Scott's - Bell 47GT-6 * Innova Helicopters C630 (Planned)<ref>{{Cite web|url=http://aviationweek.com/awinbizav/innova-picks-rolls-royce-rr300-c630-helicopter|title=Innova Picks Rolls-Royce RR300 For C630 Helicopter|website=aviationweek.com|language=en|access-date=2018-04-27}}</ref>
==Specifications (RR300)== {{jetspecs <!-- If you do not understand how to use this template, please ask at Wikipedia talk:WikiProject Aircraft --> <!-- Please include units where appropriate (main comes first, alt in parentheses). If data are missing, leave the parameter blank (do not delete it). For additional lines, end your alt units with )</li> and start a new, fully-formatted line with <li> --> |ref=''Rolls-Royce''<ref name=specs>{{cite web| url=https://www.rolls-royce.com/products-and-services/civil-aerospace/helicopters/rr300.aspx#/| title=RR300 | publisher =Rolls-Royce }}</ref> |type=Twin-spool turboshaft/turboprop |length={{convert|37.6|in|cm}} |diameter={{convert|21.5|in|cm}} |weight={{convert|201|lb|kg}} |compressor=Single-stage centrifugal |combustion= |turbine=2 stage GP, 2 stage PT |fueltype= |oilsystem= |power={{convert|240-300|shp|kW}} |thrust= |compression=6.2 |aircon= |turbinetemp= |fuelcon= |specfuelcon= |power/weight={{convert|{{#expr:201/300round3}}|lb/hp|kg/kW}} |thrust/weight= }}
==See also== {{aircontent <!-- other related articles that have not already linked: --> |see also= <!-- designs which were developed into or from this aircraft: --> |related= * Rolls-Royce Model 250 * Rolls-Royce RR500 <!-- aircraft that are of similar role, era, and capability this design: --> |similar aircraft= <!-- relevant lists that this aircraft appears in: --> |lists= <!-- For aircraft engine articles. Engines that are of similar to this design: --> |similar engines= <!-- See WP:Air/PC for more explanation of these fields. --> }}
==References== {{Reflist}}
==External links== {{Commons category}} * [https://www.rolls-royce.com/products-and-services/civil-aerospace/helicopters/rr300.aspx#/ Rolls-Royce RR300 Official page]
{{Rolls-Royce plc aeroengines}}
RR300 Category:2000s turboshaft engines