ORIGINAL: Kiwi-al
The Camel has a Gnome Rotary and the D VIII has a Oberursel Rotary made be Vintage Aviator in Masterton New Zealand.They are building a lot of cool WWI aircraft .
http://thevintageaviator.co.nz/
That's great, didn't know there were commercially-made rotaries out there. Only working model rotary I've seen is this home-build in a 1/3 scale Avro 504 [link=http://modelrotaryflyer.tripod.com/avro.htm]http://modelrotaryflyer.tripod.com/avro.htm[/link]. The engine itself is more work than I can imagine putting into an RC model