Re: Hydrolic lock on 912 ULS
Posted: Mon Jul 27, 2020 8:33 pm
As a counterpoint...
Though I’m not an engineer, I’ve often heard that one of the worst things you can do to an engine is to drag metal over metal in the absence of oil pressure. Plain bearings need oil pressure to avoid metal-to-metal contact. And the best way to build oil pressure quickly is just to start the darn thing. Which I do.
That said, I do tend to pull my prop through one complete revolution to check each blade in the same position. That, by itself, should alert me to the presence of hydraulic lock. And I tend to burp my engine and check the oil after flights. At least in my plane it seems to take about 1/3 as many “blades” to burp doing it that way as opposed to doing it before a flight.
But again, not an engineer. So I’m willing to be educated by someone who is.
Though I’m not an engineer, I’ve often heard that one of the worst things you can do to an engine is to drag metal over metal in the absence of oil pressure. Plain bearings need oil pressure to avoid metal-to-metal contact. And the best way to build oil pressure quickly is just to start the darn thing. Which I do.
That said, I do tend to pull my prop through one complete revolution to check each blade in the same position. That, by itself, should alert me to the presence of hydraulic lock. And I tend to burp my engine and check the oil after flights. At least in my plane it seems to take about 1/3 as many “blades” to burp doing it that way as opposed to doing it before a flight.
But again, not an engineer. So I’m willing to be educated by someone who is.