ercoupe performance

A licensed prop shop can cut it down and even change the pitch if you want

A 73" prop is legal only on the C-75. It is illegal to put that prop on a C-85. If you read the type certificate A-718 you will see that for the 85 horse engine the legal length for a McCauley prop is 69 ½ to 71 inches. The longer prop actually steals your horsepower - remember, hp comes from rpm, and a long prop is intended to spin more slowly with more torque.