How can I determine the original propeller size for my Formula?
Propeller charts for older Formula's are posted under the 'Vintage Formula' link on this web site. Please note these charts only represent starting points for propeller selection - there is no substitute for actual testing. Also, many engine manufacturers provide publications for estimating propeller sizes. These guides suggest propeller sizes based on boat and engine specifications. Contact the appropriate engine manufacturer for more information.updated: 4/1/2008