Concur on that. It is interesting to me to think about while they are doing all that he explained, that there are tremendous forces/environmental factors acting on it at the same time, and yet it stays together/performs safely for many years.
Cool to see. FYI (unless I missed it)... the feathered position is generally the default for multiengines. For a single engine, the default position is the opposite for max power.
Thank you so much bro! I just finished my AMT schooling and we did some propeller projects, but we didn’t get such a detailed explanation like this. Seeing the propeller actually moving and in action makes it so much easier to understand!
I'm not good at english and not good reading at MM but this really big help for me in this video. Thank you for doing this videos. I hope you make another videos thats installed in engine and how does work with a governor,FEEDback ring,beta valve,beta nuts etc.
I’m currently reading in Chapter 3 of The Turbine Pilot’s Flight Manual talking about direct drive turboprop engines and free turbine turboprop engines and the differences in both of them. This video and explanation of feathering is helpful👍
I am an instructor at an AMT school. We have a prop just like this that I need to put to use. Is there any way that I could get a few pictures of the mounting assembly/ air valve that you made for this?
Question, So durring take off props fully forward in fine pitch. When you move props back a little for cruise climb do propellers slightly move closer to feathered? Then pulled back during cruise, props move back a little more? So props mainly move on a diagonal & not horizontally?
if rpm is constant, every pitch angle gives/requests some power, small pitch-small power , but prop blade has different angle of attack that depends of radius, highest is near hub smallest is at tip/end/top of blade so on some small pitches prop can make negative or no force because inner radius blade can have positive angle of attack and outer part can have negative AoA, but above some pitch where whole blade is in positive AoA prop makes positive force and engine governor keeps rpm constant by changing pitch no matter of power lever position (above idle). props do not move diagonal or horizontal, it spins on shaft but blades move like screw but without going in and out, as pitch changes
By no means am I an expert on all CSVP propellers, but on my model (NP2000), we had a pump housing that was stationary, affixed to a prop adapter that sat on the prop shaft. The pump housing held the hydraulic fluid necessary for propeller operation, and while it was stationary, the inner ring of the pump housing that sat on the prop adapter would spin, which spun the gears inside the pump housing that operated the pumps. From there, the pump housing sent fluid forward to the actuator valve module (AVM) that’s inside of the propeller hub. Then fluid was sent forward to the variable pitch actuator (VPA) which sits on the front of the propeller hub, but the VPA has a transfer tube out of the rear that sits inside of the AVM to receive the hydraulic fluid for pitch actuation. The VPA contained a yoke assembly that moved fore and aft depending on hydraulic pressure. Each blade is fitted with a roller bearing at its base inside the hub that sat inside these yokes that established blade angle
@@marshallcarter6106 if is free turbine engine, it goes to feather, if is not free turbine engine it has to have system that automatic moves blades on feather below some rpm because is no spring in hub because that engines at start up must rotate whole engine-transmission-prop assembly and therefore they start up engine with prop on low pitch. piston engines mostly have no automatic feathering so pilot must put it on feather position
counter weights balance mass of props blades, because without of it , prop goes on low pitch when prop is rotating, so it helps to reduce force needed for pitch manipulation
