Editing Wankel engine (section)

===Other uses===
[[File:UAV-741-F.jpg|thumb|'''Figure 33.'''<br/>UEL UAV-741 Wankel engine for [[AAI RQ-7 Shadow]] [[UAV]]]]

The Wankel engine is well-suited for devices in which a human operator is close to the engine, e.g., hand-held devices such as chainsaws.<ref name="Ansdale Keller 1971 p. 214">{{cite book |last1=Ansdale |first1=R.F. |last2=Keller |first2=H. |title=Der Wankelmotor: Konstruktion und Wirkungsweise |place=Stuttgart| publisher=Motorbuch-Verlag |year=1971 |language=de |page=214}}</ref> The excellent starting behavior and low mass make the Wankel engine also a good powerplant for portable fire pumps and portable power generators.<ref name="Ansdale Keller 1971 p. 215">{{cite book |last1=Ansdale |first1=R.F. |last2=Keller |first2=H. |title=Der Wankelmotor: Konstruktion und Wirkungsweise |place=Stuttgart| publisher=Motorbuch-Verlag |year=1971 |language=de |page=215}}</ref>

Small Wankel engines are being found in applications such as [[kart racing|go-karts]], [[personal watercraft]], and [[auxiliary power unit]]s for aircraft.<ref name="o4ITr">{{cite web|url= http://www.der-wankelmotor.de/Motoren/UAV/Pats/pats.html |title=Pats APU |publisher=Der Wankelmotor |location=DE |access-date= 2009-07-03}}</ref> [[Kawasaki Heavy Industries|Kawasaki]] patented mixture-cooled rotary engine (US patent 3991722). Japanese diesel engine manufacturer [[Yanmar]] and [[Dolmar|Dolmar-Sachs]] of Germany had a rotary-engined chain saw (SAE paper 760642) and outboard boat engines, and the French Outils Wolf, made a lawnmower (Rotondor) powered by a Wankel rotary engine. The rotor was in a horizontal position to save on production costs, and there were no seals on the downside.

The simplicity of the rotary engine makes it well-suited for mini, micro, and micro-mini engine designs. The [[Microelectromechanical systems]] (MEMS) Rotary Engine Lab at the [[University of California, Berkeley]], formerly researched developing rotary engines down to 1&nbsp;mm in diameter, with displacements less than 0.1&nbsp;cc. Materials include silicon, and motive power includes compressed air. The goal of such research was to eventually develop an internal combustion engine with the ability to deliver 100 milliwatts of electrical power, with the engine serving as the rotor of the [[electric generator]], with [[magnet]]s built into the engine rotor.<ref name="zRdO7">{{cite journal |title=MEMS Rotary Engine Power System |journal=IEEJ Transactions on Sensors and Micromachines |volume=123 |issue=9 |pages=326 |publisher=University of California |location=Berkeley, California |date=2004-01-14 |bibcode=2003IJTSM.123..326F |last1=Fernandez-Pello |first1=A. Carlos |last2=Pisano |first2=Albert P. |last3=Fu |first3=Kelvin |last4=Walther |first4=David C. |last5=Knobloch |first5=Aaron |last6=Martinez |first6=Fabian |last7=Senesky |first7=Matt |last8=Stoldt |first8=Conrad |last9=Maboudian |first9=Roya |last10=Sanders |first10=Seth |last11=Liepmann |first11=Dorian |doi=10.1541/ieejsmas.123.326 |doi-access=free}}</ref><ref name="ZZSJW">{{cite web|url= http://www.me.berkeley.edu/cpl/media/memsff01.pdf |title=34474_2 |access-date=2010-12-20 |url-status=dead |archive-url= https://web.archive.org/web/20100710020103/http://www.me.berkeley.edu/cpl/media/memsff01.pdf |archive-date=July 10, 2010}}</ref> Development of the miniature rotary engine stopped at UC Berkeley at the end of the DARPA contract.

In 1976, ''Road & Track'' reported that [[Ingersoll-Rand]] would develop a Wankel engine with a chamber volume V<sub>k</sub> of {{cvt|25|dm3|in3|-2|order=flip}} with a rated power of {{cvt|500|hp|kW|0}} per rotor.<ref name="Road & Track 1976 p. 89">{{cite book |title=Road & Track |publisher=Bond Publishing |issue=Bd. 28 |year=1976 |page=89}}</ref> Eventually, 13 units of the proposed engine were built, albeit with a larger displacement, and covered over 90,000 operating hours combined. The engine was made with a chamber volume V<sub>k</sub> of {{cvt|2500|in3|dm3|0}}, and a power output of {{cvt|550|hp|kW|0}} per rotor. Both single, and twin-rotor engines were made (producing {{cvt|550|hp|kW|0}} or {{cvt|1100|hp|kW|0}} respectively). The engines ran on natural gas and had a relatively low engine speed due to its application.<ref name="The Rotary Combustion Engine: A Candidate for General Aviation 1978 p. 127">{{cite book |title=The Rotary Combustion Engine: A Candidate for General Aviation |editor=((National Aeronautics and Space Administration)) |series=NASA conference publication |year=1978 |page=127}}</ref>

[[Deere & Company]] acquired the Curtiss-Wright rotary division in February 1984, making large multi-fuel prototypes, some with an 11-liter rotor for large vehicles.<ref name=silvestri/><ref name="DgihD">{{Citation |title=Stratified Charge Rotary Engine Developments at JDTI (John Deere Technologies International) from 1984 to 1991 |first1=Charles |last1=Jones |year=1992}}</ref><ref>{{cite web |last1=Proft |first1=Bill |title=The John Deere Rotary Engine |url= https://greenmagazine.com/the-john-deere-rotary-engine/ |website=greenmagazine.com |date=9 October 2018}}</ref> The developers attempted to use a stratified charge concept.<ref name=silvestri>{{cite web |first1=William B. |last1=Silvestri |first2=Edward S. |last2=Wright |title=John Deere Score Engines in Marine Applications |url= https://asmedigitalcollection.asme.org/GT/proceedings-pdf/GT1986/79290/V002T03A005/2396441/v002t03a005-86-gt-256.pdf |publisher=American Society of Mechanical Engineers |date=1986 }}</ref> The technology was transferred to RPI in 1991.<ref>{{cite news |title=Deere Pulls Out of the Rotary Engine Race |url= https://www.chicagotribune.com/news/ct-xpm-1991-04-10-9102020081-story.html |newspaper=Chicago Tribune |date=10 April 1991 }}</ref><ref>{{cite web |last1=Gilboy |first1=James |title=The 11.6-Liter, Big-Block Diesel Rotary Was Just Too Good for This World |url= https://www.thedrive.com/news/36426/the-11-6-liter-big-block-diesel-rotary-was-just-too-good-for-this-world |website=thedrive.com |archive-url= https://web.archive.org/web/20210803024956/https://www.thedrive.com/news/36426/the-11-6-liter-big-block-diesel-rotary-was-just-too-good-for-this-world |archive-date=3 August 2021 |date=15 September 2020 |url-status=live}}</ref>

[[Yanmar]] of Japan produced small, charge-cooled rotary engines for chainsaws and outboard engines.<ref name="JhAV3">{{cite web|url= http://www.der-wankelmotor.de/Motoren/Yanmar-Diesel/yanmar-diesel.html |title=Yanmar Diesel |publisher=Der Wankelmotor |location=DE |access-date=2010-12-20}}</ref> One of its products is the LDR (rotor recess in the leading edge of the combustion chamber) engine, which has better exhaust emissions profiles, and reed-valve controlled intake ports, which improve part-load and low rpm performance.<ref name="HMj5q">{{Citation |first1=Kojiro |last1=Yamaoka |first2=Hiroshi |last2=Tado |publisher=SAE |title=720466 |year=1972}}</ref>

In 1971 and 1972, [[Arctic Cat]] produced snowmobiles powered by Sachs KM 914 303-cc and KC-24 294-cc Wankel engines made in Germany.

In the early 1970s, [[Outboard Marine Corporation]] sold snowmobiles under the Johnson and other brands, which were powered by {{convert|35|or|45|hp|abbr=on}} OMC engines.

Aixro of Germany produces and sells a go-kart engine with a 294-cc-chamber charge-cooled rotor and liquid-cooled housings. Other makers include Wankel AG, Cubewano, Rotron, and Precision Technology.