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The Type Certificate TC A-787 for all model Ercoupe/Forney/Alon/Mooney except for The 415-C is listing all allowed & certified items on your plane. eg. Propellers and Propeller Accessories 1. Sensenich 74CT48 or 74KT48 14 lbs. (-32) (For flanged type crankshaft) or any other fixed pitch wood propeller, rated for the engine power and speed which meets the following limits: Static r.p.m. at max. permissible throttle setting: (Model 415-D with C75 engine): not over 2100, not under 2000. (Models 415-D, E and G with C85 engine): not over 2100, not under 1900. No additional tolerance permitted. Diameter: not over 74 inches, not under 72 inches. 2. McCauley 1A90CF or 1B90CM (Model 415-D with C75 engine) +12 lbs. (-32) Static r.p.m. at maximum permissible throttle setting: Not over 2110, not under 2010. No additional tolerance permitted. Diameter: not over 73 inches, not under 71.5 inches. 3. Hartzell hub HA12UO or HA12UF 18 lbs. (-32) Blades 7414 to 7014 or 7214M to 7014M (ground adjustable) Eligible on all engines with static r.p.m. and diameter limits shown for fixed pitch wood propellers. 4. Fixed pitch metal, McCauley 1A90CF or 1B90CM +12 lbs. (-32) Eligible on Models M10, A2, A2-A, 415-D (per note 4(b)), E, G, F-1 and F-1A. Static r.p.m. at maximum permissible throttle settings: For Models 415-D, E, or G: not over 2225, not under 2025. For Models M10, A-2, A2-A, F-1, F-1A: not over 2375, not under 2250. No additional tolerance permitted. Diameter: not over 71 inches, not under 69.5 inches.
