Who manufactured the original Bluebird as piloted by Donald Campbell?
The first boat was designed by F W Cooper and built by Saunders-Roe, with Reid Railton as mechanical consultant. Then from what I understand, and have read, The Norris Brothers were engaged to design the Bluebird K7 which was launched in 1955. The below site will give you a lot more details on what you are looking for. Pretty good reading.
