Podcasts
Shop
Our partners
Before you go any further...
I've read and accept the Terms of Use and the Privacy Policy.
I accept to receive newsletter and other communications associated with firms of The Explorers Network group'
I accept to receive commercial offers of The Explorers Network partners'.
Thanks!
Vote everyday for your favorite content
SENSITIVE CONTENT
This media contains sensitive content which some people may find disturbing or offensive.
You must be 15 years of age or older to view sensitive content.
Log inBirthday
Content being validated
THE EXPLORERS +
Watch our premium movies
The Explorers + is our premium movie catalog in Ultra High Definition (HD/4K/8K)! Hundreds of videos already available and daily new content on all your devices (web, mobile, tablets, smart TV).
Post content (photo or video) and get 1-month free
OR
Subscribe and support The Explorers Foundation's field actions for biodiversity.
Content being validated
The Oberursel UR.2 rotary star engine
3
0
The German firm Motorenfabrik Oberursel AG has been manufacturing automobile, locomotive and aircraft engines since 1898 in Oberursel near Frankfurt am Main. In 1913, it bought the licence for the French Rhône 9J engine and produced the 110 hp Oberursel UR.2 rotary star engine (photo). At the beginning of the Great War, the Fokker Dr.I and Fokker D.VI powered by the UR.2 engine wreaked havoc in aerial combat. From 1917 onwards, the low power of the UR.2 made it obsolete. Moreover, the lack of castor oil, essential to its operation, and the poor quality of its substitute reduced its reliability and longevity.
Related content
Médias en cours d’exploration