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 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'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 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?
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
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
@@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
Aircraft props are the most overlooked and misunderstood aspects of aviation. Everyone just seems to take them for granted until they fail.
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.
This is honestly the most helpful video of a constant speed prop that I have seen. Thank you!
Glad i could help. Thanks for your feedback!!!
This seems so simple as the explanation is so good. Most people struggle explain the pitch, only confusing the helpless person who is trying to learn.
Very CLEAN and easy to understand
❤
Great info! Didn't realize they work like helicopter blades.
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.
As "just a pilot" it's great to see this stuff demonstrated and explained up close and clearly like this!
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!
Very nice! Thank you for sharing!
Great demonstration!
Thank you the best informative video about variable pitch propellers
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'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.
Excellent video, 👍🏾
Thanks for the great explanation
Explanation with demo, example hepls ordinary views to understand,thanx n hope so in future.
Nice video
nicely done.
Thank you
"HighPitchLowRPM", It's one word!
Nice 👍
Very Nice,
Love it carry on
démonstration très intéressante sur les hélices à pas variables.
Tnakz sir more viboe,,sir
Mantap, 👍👍
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?
and it is used 99% on turbo props with free turbine(self feathering props), for non free turbine turbo props are used non self feathering props
How do you feed hydraulic fluid into an assembly spinning on a axle??
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
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
Whats the normal or resting state of the blades if pressure was lost?
The prop will rest in the feather position. As the engine begins to rotate, it will move to a less course position.
It depends on the engine and prop hub design. Some fail to fine pitch, some fail to coarse pitch, some fail to feather.
@@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
He didn't talk about the function of counter weights. There are moments when they are more forceful than the dome spring.
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
my dad made me do this
Your father is a brilliant man!!!