Ohlsson Twin by Irwin Ohlsson, CA, "Wartime" Engine 1944
Known as the P4Y this engine was designed to produce scale horsepower, torque, and thrust of the full size R-3350 engines slated for use in the newly developed Consolidated Corp. flying boats. Scale model aircraft and propellers were built for these engines so the most accurate flight characteristics and data could be collected and applied proportionally to the full size aircraft design.
It measures 7-3/4 wide (without spark plugs), 6-3/4 high (including exhaust), 8 inches long, weighs 3 pounds- 10 ounces, and burns gasoline on spark ignition. Note it carried fuel from the crankcase to the cylinders through a large external manifold rather than the commonly used bypass cast into the cylinder wall. Capable of 2.5 horsepower It was rated at 1.6 bhp at 4200 rpm and produced scale horsepower at scale rpm.
See More Two-Cylinder Engines at: www.flickr.com/photos/15794235@N06/sets/72157649352645204/
See Our Model Engine Collection at: www.flickr.com/photos/15794235@N06/sets/72157602933346098/
Visit our Photo Albums at: www.flickr.com/photos/15794235@N06/sets
Courtesy of Paul and Paula Knapp
Miniature Engineering Museum
Ohlsson Twin by Irwin Ohlsson, CA, "Wartime" Engine 1944
Known as the P4Y this engine was designed to produce scale horsepower, torque, and thrust of the full size R-3350 engines slated for use in the newly developed Consolidated Corp. flying boats. Scale model aircraft and propellers were built for these engines so the most accurate flight characteristics and data could be collected and applied proportionally to the full size aircraft design.
It measures 7-3/4 wide (without spark plugs), 6-3/4 high (including exhaust), 8 inches long, weighs 3 pounds- 10 ounces, and burns gasoline on spark ignition. Note it carried fuel from the crankcase to the cylinders through a large external manifold rather than the commonly used bypass cast into the cylinder wall. Capable of 2.5 horsepower It was rated at 1.6 bhp at 4200 rpm and produced scale horsepower at scale rpm.
See More Two-Cylinder Engines at: www.flickr.com/photos/15794235@N06/sets/72157649352645204/
See Our Model Engine Collection at: www.flickr.com/photos/15794235@N06/sets/72157602933346098/
Visit our Photo Albums at: www.flickr.com/photos/15794235@N06/sets
Courtesy of Paul and Paula Knapp
Miniature Engineering Museum