Here is the Bentley BR-2 engine in 1:32 scale
Designed by nx13688
I designed this engine as an upgrade for the Digital Card Models Sopwith Snipe, which was my entry in the 2005 Paperwarbirds contest.
The PDF is 1 A4/letter size sheet with parts for 2 complete engines and 1 display stand so it can be built as a stand-alone model. You may wish to scale it up for that purpose as it is only 1.1in(28mm) in diameter @ 1/32 scale; the PDF is an unlocked vector file so scaling is easy.