{{Use dmy dates|date=November 2019}} {{Infobox automobile | image = 1965 Elfin Mono.jpg | name = Elfin Type 100 Mono | manufacturer = Elfin Sports Cars | production = 1964-1969; 19 built<ref name="Elfin Mono PDF">{{usurped|1=[https://web.archive.org/web/20110714070225/http://melbourneclassics.com/files/ELFIN_MONO_LIST2.pdf Article title]}} {{Bare URL PDF|date=March 2022}}</ref> | predecessor = Formula Junior / Catalina<ref name="Elfin Sports Cars PDF">http://www.shannons.com.au/library/events/ELFIN.PDF {{Webarchive|url=https://web.archive.org/web/20220111133149/http://www.shannons.com.au/library/events/ELFIN.PDF |date=11 January 2022 }} {{Bare URL PDF|date=March 2022}}</ref> | successor = Elfin 600<ref name="Elfin Sports Cars PDF" /><ref>John Blanden and Barry Catford, Australia's Elfin sports and racing cars, 1997, Page 80</ref> | class = Australian 1½ Litre Formula | platform = | body style = | engine = Lotus Twin Cam<ref name="Elfin Mono PDF" /><br />Clisby V6<ref name="Elfin Mono PDF" /><br />Ford 1500<ref name="Elfin Mono PDF" /><br />Ford Cosworth 1100<ref name="Elfin Mono PDF" /> | length = | width = | height = | weight = | related = | designer = Garrie Cooper }}

The '''Elfin Type 100 Mono''' is an Australian 1½ Litre Formula racing car produced from 1964-1969 by Elfin Sports Cars. The name "Mono" refers to the fact that it was constructed upon a monocoque design.

==Development== [[File:Elfin Mono Type 100.jpg|thumb|left|Elfin Type 100 Mono at the National Motor Museum at Birdwood in South Australia]] In 1963, Garrie Cooper began work on a revolutionary monocoque design of a car intended to dominate the newly created Australian 1½ Litre capacity class. Lotus Cars had already built the Formula 1 monocoque under the direction of Colin Chapman but the idea was still in its infancy so Cooper had only vague ideas of the design. The monocoque build removed the need for the traditional "Superleggera" tube frame chassis and harnessed a very light sheet steel frame to which aluminum panels were riveted for a very stiff structure. The finished structure weighed approximately 80&nbsp;kg less than the tube framed Elfin Catalina it replaced. Uniquely, the hollow section of the body was sealed off to serve as the petrol tank. The Elfin Mono eventually made its debut at the August 1964 Melbourne Racing Car show and orders quickly followed.<ref>{{cite web|url=http://melbourneclassics.com/files/THREE_AUSTRALIAN_GPs.pdf|title=Three Australian GPs: The Story of Elfin Mono 6446|access-date=8 April 2010|website=Mostly Kicking Tyres|archive-url=https://web.archive.org/web/20110821175236/http://melbourneclassics.com/files/THREE_AUSTRALIAN_GPs.pdf|archive-date=21 August 2011|url-status=usurped}}</ref>

==References== {{Reflist}}

{{Elfin}}

Type 100 Mono Category:Tasman Series cars Category:Cars of Australia