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09-20-2012, 05:00 PM
Mike | Prop vrs RPM/MP
How does one figure out the blade angle at 24/24?
09-29-2012, 02:24 AM
jar59nh | Blade angle variable
Hi Mike,
It depends on many factors, airspeed, temperature & pressure altitude. Not sure you can nail it down easily. One possible way would be to read the prop governor pressure being sent to the prop. I don't know if that's possible with the governor on the front. Probably could do on IO-360 setup with gov on back of engine.
For a given govenor pressure the oil pushes against the prop spring and gives a certain blade angle. The govenor is using its speed sensing system to change the blade angle to maintain a constant RPM, i.e. 2400.
That's about the only way I could think it would be possible. Although a set of high speed photos from a chase plane abeam the prop might reveal the angle too.
Food for thought,
John
Mike | Prop vrs RPM/MP
How does one figure out the blade angle at 24/24?
09-29-2012, 02:24 AM
jar59nh | Blade angle variable
Hi Mike,
It depends on many factors, airspeed, temperature & pressure altitude. Not sure you can nail it down easily. One possible way would be to read the prop governor pressure being sent to the prop. I don't know if that's possible with the governor on the front. Probably could do on IO-360 setup with gov on back of engine.
For a given govenor pressure the oil pushes against the prop spring and gives a certain blade angle. The govenor is using its speed sensing system to change the blade angle to maintain a constant RPM, i.e. 2400.
That's about the only way I could think it would be possible. Although a set of high speed photos from a chase plane abeam the prop might reveal the angle too.
Food for thought,
John