30cc OHC Model Tether Boat Engine by Harry A. Pingstone, Zimbabwe (formerly Rhodesia), 1933
Mr. Pingstone built his own lathe and milling machine to produce this engine.
The engine measures 10 inches high, 9 inches wide, and 5 inches long including the flywheel. With a bore of 32mm and a stroke of 37mm this 29.75cc (1.8 cu in) engine burns gasoline on spark ignition. It utilizes a pressurized dry-sump lubrication system, a pressurized fuel system, and Mr. Pingstone’s custom designed gear-driven over head cam. He fabricated all of the parts including the castings for the crankcase and gear box and machined everything else from bar stock. The head (as well as the cylinder) is machined from solid cast iron with 3/4 inch ports and manganese valves measuring 7/8 inch in diameter. The valves are set at 45 degrees, each captured by two springs and retained with split collets.
Then the engine was sent to Edgar T. Westbury in 1933 for his analysis and comments which were later published in The Model Engineer and Practical Electrician in March of 1934. After the engine was returned to Mr. Pingstone he made several modifications to the cylinder and head, and fabricated a new carburetor before mounting it into his tether boat. Housed within the boat is the split fuel/oil tank each with its respective inline filter, as well as a pull starter and an electric switch to turn off the ignition.
See More Model 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 Rod and Elsie Pingstone
Paul and Paula Knapp
Miniature Engineering Museum
30cc OHC Model Tether Boat Engine by Harry A. Pingstone, Zimbabwe (formerly Rhodesia), 1933
Mr. Pingstone built his own lathe and milling machine to produce this engine.
The engine measures 10 inches high, 9 inches wide, and 5 inches long including the flywheel. With a bore of 32mm and a stroke of 37mm this 29.75cc (1.8 cu in) engine burns gasoline on spark ignition. It utilizes a pressurized dry-sump lubrication system, a pressurized fuel system, and Mr. Pingstone’s custom designed gear-driven over head cam. He fabricated all of the parts including the castings for the crankcase and gear box and machined everything else from bar stock. The head (as well as the cylinder) is machined from solid cast iron with 3/4 inch ports and manganese valves measuring 7/8 inch in diameter. The valves are set at 45 degrees, each captured by two springs and retained with split collets.
Then the engine was sent to Edgar T. Westbury in 1933 for his analysis and comments which were later published in The Model Engineer and Practical Electrician in March of 1934. After the engine was returned to Mr. Pingstone he made several modifications to the cylinder and head, and fabricated a new carburetor before mounting it into his tether boat. Housed within the boat is the split fuel/oil tank each with its respective inline filter, as well as a pull starter and an electric switch to turn off the ignition.
See More Model 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 Rod and Elsie Pingstone
Paul and Paula Knapp
Miniature Engineering Museum