Aircraft – FS2004 Blackburn Type B-20 March 31, 2007 FS2004 Blackburn Type B-20. A prototype twin-engined flying boat with retracting floats, based at Dumbarton in early 1940. Version 01 by Edward Cook. 9,5 Mb Discover more from Perfect Flight Subscribe to get the latest posts sent to your email. Type your email… Subscribe