It is approx. 1/8 scale being 1m in length. This model is designed for a 90mm EDF fan but can be made to be propeller driven.
Donald Campbell's Bluebird K7 1/16th Scale Model Boat
Bluebird K7 1/10th Scale Model Boat
Donald Campbell's Bluebird K7 1/12th Scale Model Boat
Bluebird K7 1/8th Scale Model Boat suitable for RC