I have read the many threads with differing priorities and hardware designs. One design with cable operated sliding plate on the bottom of the fab addressed the hardware failure since pieces would not go in the engine.
Rocket Bob referenced a passive spring loaded design shamelessly copied from a Bonanza.
I envision a passive actuation ( no pilot or cable ) using gravity instead of a spring to close. This could be a machined disc covering holes in the bottom of the fab. I have experimented in my RV3 that somewhere around 1200 to 1400 RPM keep the plane flying indefinitely. So. The holes could be ?tuned? on the ground to supply the desired RPM. The diameter and weight of the ?poppet valve? depends on intake suction. As I recall from messing with auto engines, the vacuum is about 18 inches.
Does anyone know of a good starting point (inches of suction) for calculations on the Lycoming ? Suggestions & critique are welcome .
Rocket Bob referenced a passive spring loaded design shamelessly copied from a Bonanza.
I envision a passive actuation ( no pilot or cable ) using gravity instead of a spring to close. This could be a machined disc covering holes in the bottom of the fab. I have experimented in my RV3 that somewhere around 1200 to 1400 RPM keep the plane flying indefinitely. So. The holes could be ?tuned? on the ground to supply the desired RPM. The diameter and weight of the ?poppet valve? depends on intake suction. As I recall from messing with auto engines, the vacuum is about 18 inches.
Does anyone know of a good starting point (inches of suction) for calculations on the Lycoming ? Suggestions & critique are welcome .