Stuart Lightweight Gas Boat Engine, UK, circa 1910
Unlike most Stuart marine engines this Lightweight has only two ports instead of three. The cylinder and crankcase is a one-piece aluminum casting with short thick mounting lugs and only one bolt on each side. Note also there is a cover plate bearing the Stuart name that seals the bypass and one on the bottom of the crankcase to access the connecting rod cap. The two-piece connecting rod, timer assembly, carburetor, and exhaust stack are bronze castings instead of aluminum that was used in most the Lightweight engines.
It has a 38.2mm bore and 32.5mm stroke for a total displacement of 37cc (2.3 cu in), measures 6.25 long, 4.25 wide, and 7 inches tall (excluding the spark plug), and weighs 5 lbs – 12 oz. Typical of most two stroke engines it burns gasoline with oil mixed in for lubrication but, unusually, sports an air-cooled head atop a water-cooled cylinder.
The Lightweight was a popular speed boat racing engine accomplishing speeds of well over 30 miles per hour; it is capable of high speed bursts as well as continuous work loads.
See More Boat Engines at: www.flickr.com/photos/15794235@N06/sets/72157641089388694/
See More 1-Cylinder Engines at: www.flickr.com/photos/15794235@N06/albums/72157656174064422
See Our Model Engine Collection at: www.flickr.com/photos/15794235@N06/sets/72157602933346098/
Visit Our Photo Sets at: www.flickr.com/photos/15794235@N06/sets
Courtesy of Paul and Paula Knapp
Miniature Engineering Museum
Stuart Lightweight Gas Boat Engine, UK, circa 1910
Unlike most Stuart marine engines this Lightweight has only two ports instead of three. The cylinder and crankcase is a one-piece aluminum casting with short thick mounting lugs and only one bolt on each side. Note also there is a cover plate bearing the Stuart name that seals the bypass and one on the bottom of the crankcase to access the connecting rod cap. The two-piece connecting rod, timer assembly, carburetor, and exhaust stack are bronze castings instead of aluminum that was used in most the Lightweight engines.
It has a 38.2mm bore and 32.5mm stroke for a total displacement of 37cc (2.3 cu in), measures 6.25 long, 4.25 wide, and 7 inches tall (excluding the spark plug), and weighs 5 lbs – 12 oz. Typical of most two stroke engines it burns gasoline with oil mixed in for lubrication but, unusually, sports an air-cooled head atop a water-cooled cylinder.
The Lightweight was a popular speed boat racing engine accomplishing speeds of well over 30 miles per hour; it is capable of high speed bursts as well as continuous work loads.
See More Boat Engines at: www.flickr.com/photos/15794235@N06/sets/72157641089388694/
See More 1-Cylinder Engines at: www.flickr.com/photos/15794235@N06/albums/72157656174064422
See Our Model Engine Collection at: www.flickr.com/photos/15794235@N06/sets/72157602933346098/
Visit Our Photo Sets at: www.flickr.com/photos/15794235@N06/sets
Courtesy of Paul and Paula Knapp
Miniature Engineering Museum