The Blackburne Tomtit was a 670 cc V-twin aero engine for light aircraft that was designed and produced by Burney and Blackburne Limited.

Burney and Blackburne was based at Bookham, Surrey, England and was a former motorcycle manufacturer.

The Tomtit was a modified version of the Lympne 696 cc V-twin, marketed specifically for flight.

The inverted configuration was more common, but the Avro 558 used it in the upright arrangement,[2] and the Avro 560 flew with both upright and inverted Tomtits.

[3] Data from Flight[1] Related lists Douglas Light Aero engines from Kingswood to Cathcart.Page 106 Brian Thorby 2010 Redcliffe Press, Bristol ISBN 978-1-906593-25-4