This engine built by an Indycar machinist known as “Cally” has a custom made 3:1 belt gearing system. It is marked “Gilardoni” in the cylinder casting.

Joe Bridi donated a portion of his engine collection, along with some R/C aircraft, in July 2012. Mr. Bridi is a long-time champion R/C aircraft flyer. At one time he had a collection of over 600 model engines. Many have since been sold, but he has donated some unusual and prototype engines that he flew in competition over the years. The museum also displays some of Joe’s R/C aircraft, featuring examples of some of his most popular kits. Most were his trade show display models. Our thanks to Joe Bridi for his contribution.

The Quadra .50 single-cylinder with 3:1 belt drive.

Exhibit added: June 25, 2012 - Last modified: April 5, 2023

Presented by The Joe Martin Foundation for Exceptional Craftsmanship