I find it amazing how sometimes you can read the text books, and still not quite understand something. But with a good, simple and clear explanation with a graph and drawings, then finally the light bulb turns on, and it all makes sense. Great video, thank you!
Who gave this a thumbs down?! It's a great simple graph to show that fixed pitch props have a design preferred speed at which they most efficiently bite the air! This is the same basic concept in gas generating turbine engines when dealing with compressor stall. I think your white board graphs do superb job of explaining relatively complex concepts in a simple manner. Books and manuals can tell you all the equations and theory, but sometimes it takes a simple visual chart along with a basic no-nonsense explanation to really get the point across. Well done!
If you look at the thumbnail of this video, the propeller blades are almost parallel to the axis of rotation. But all propeller diagrams illustrate lift and thrust with the chord angle at 45degrees. I can't envision the lift and thrust when the propellers are close to zero degrees.
It means at roll take-off we left our speed build up first and increase engine power so to obtain max thrust for take-off ?....thanks for your effort to make these video...👍👍
01:10 to 01:15 how can the TAS increase at the same rpm ? I thought that if the speed increases RPM increases too and vice versa , explanation please :)
I thought a fixed pitch blade/propeller kept the angle of attack the same? And a variable pitch blade/propeller changed its angle of attack? And I thought the tip of the blade is the end of the propeller blade where the propeller travels the longest distance as it makes a full rotation??
@@PilotEd I was thinking about the tecnical aspects like what changes within the engine when the pitch is changed. I've worked out the mecanisms but can't get my head around as to what happens to manfiold pressure and the actual combustion in the piston as the blade pitches to a higher angle in cruise for example :)
@@LUXAviators prop pitch is really nothing to do with the engine? just a hydraulic system that changes the pitch, of course it will affect how easy or hard it is for the engine to move the prop. but same engine
@@PilotEd Yea sure but as the rpm on the prop drops and blade angle increases, the prop is harder to swing. The engine is obvisously turning at that speed now so something must happen to manifold as the engine changes rpm
Not quite right to say that a fixed-pitch prop has the proper angle of attack at only one speed. It is correct to say that a fixed pitch prop has only one airspeed producing the proper blade angle of attack AT a given rpm.
Wait... the rounded part of the propeller blade on your drawing is the tip!? This is really getting annoying that I can't get a straight answer to my question anywhere on the internet. Logically if a prop has a bigger bend inward it should push MORE air... however, what I'm seeing when searching for propellers is that the higher the physical pitch of each blade the LESS thrust you get!?
@@PilotEd These are 3024 www.amazon.com/Propellers-Compatible-Babyhawk-R-Multirotors-Quadcopters/dp/B07D6PCBBM/ref=sr_1_7?crid=8X63ANHQLSW1&keywords=3+inch+props&qid=1565771521&s=gateway&sprefix=3+inch+prop%2Caps%2C134&sr=8-7 These are 3052 www.amazon.com/GEMFAN-Propeller-Quadcopter-Drone%EF%BC%88Black-Transparent%EF%BC%89/dp/B07DCLG82R/ref=sr_1_4?keywords=3+inch+props&qid=1565771648&s=gateway&sr=8-4 The 3024's look FAR more pitched than the 3052's do they not? Maybe it's just an illusion? It looks pretty clear though.
Maybe you can make a video about contingency fuel and flight planning? When to use in the calculations? Because some of the questions are really misleading...
I find it amazing how sometimes you can read the text books, and still not quite understand something. But with a good, simple and clear explanation with a graph and drawings, then finally the light bulb turns on, and it all makes sense. Great video, thank you!
Who else from atplq 817451 comment?
Who gave this a thumbs down?! It's a great simple graph to show that fixed pitch props have a design preferred speed at which they most efficiently bite the air! This is the same basic concept in gas generating turbine engines when dealing with compressor stall. I think your white board graphs do superb job of explaining relatively complex concepts in a simple manner. Books and manuals can tell you all the equations and theory, but sometimes it takes a simple visual chart along with a basic no-nonsense explanation to really get the point across. Well done!
thanks so much mate, thats exactly what im going for! thanks for watching
Thank you so much for the detailed explanation, easily understood.
The best explanation ever and I went throught a lot. Thanks for your time and effort Ed!
Thank you very much! Graph is so clear, and it makes it so easy to understand and remember the correlation between velocity, RPM and alpha in FPP
insane explanation, love your video’s 💪🏻 thanks
Great video, thank you for easy interpretation of this and a clear graph explanation ! Wish you all the best.
Thanks so much for this video. These kind of questions always confuse me but you made it quite simple and easy to see. Nice work, Cheers!
Great video, helps a lot. Thanks!
If you look at the thumbnail of this video, the propeller blades are almost parallel to the axis of rotation. But all propeller diagrams illustrate lift and thrust with the chord angle at 45degrees. I can't envision the lift and thrust when the propellers are close to zero degrees.
Nice explanation 🙂
thank you very much!!
Amazing explanation!!!
ED you are an amazing techer
Amazing explanation
Very, very good explanation. Thank you Ed :)
Very nicely presented... cheers and keep it up.
So easy and nice explained, thanks :-)
The best explanation I have found so far. Thanks a lot !
cheers:)
It means at roll take-off we left our speed build up first and increase engine power so to obtain max thrust for take-off ?....thanks for your effort to make these video...👍👍
01:10 to 01:15 how can the TAS increase at the same rpm ? I thought that if the speed increases RPM increases too and vice versa , explanation please :)
I thought a fixed pitch blade/propeller kept the angle of attack the same? And a variable pitch blade/propeller changed its angle of attack? And I thought the tip of the blade is the end of the propeller blade where the propeller travels the longest distance as it makes a full rotation??
thats all correct yes :)
Can you do a video on constant spped props? :)
this one kinda covers it I think no? just think of the speed vector vs angle as in the video, but for a prop that doesn't move :)
@@PilotEd I was thinking about the tecnical aspects like what changes within the engine when the pitch is changed. I've worked out the mecanisms but can't get my head around as to what happens to manfiold pressure and the actual combustion in the piston as the blade pitches to a higher angle in cruise for example :)
@@LUXAviators prop pitch is really nothing to do with the engine? just a hydraulic system that changes the pitch, of course it will affect how easy or hard it is for the engine to move the prop. but same engine
@@PilotEd Yea sure but as the rpm on the prop drops and blade angle increases, the prop is harder to swing. The engine is obvisously turning at that speed now so something must happen to manifold as the engine changes rpm
Never understood exactly this stuff! No I do! Thanks!!!!!
thanks
More! :)
amazing video, you wrote bettween instead of between tho lol
Hey Ed, anyway you could do some videos on convergency and departure? And possibly grid navigation on polar stereographic charts? :)
you got it mate :)
Not quite right to say that a fixed-pitch prop has the proper angle of attack at only one speed. It is correct to say that a fixed pitch prop has only one airspeed producing the proper blade angle of attack AT a given rpm.
Wait... the rounded part of the propeller blade on your drawing is the tip!?
This is really getting annoying that I can't get a straight answer to my question anywhere on the internet. Logically if a prop has a bigger bend inward it should push MORE air... however, what I'm seeing when searching for propellers is that the higher the physical pitch of each blade the LESS thrust you get!?
I think your a little confused, what your question and ill try to answer it :)
@@PilotEd These are 3024 www.amazon.com/Propellers-Compatible-Babyhawk-R-Multirotors-Quadcopters/dp/B07D6PCBBM/ref=sr_1_7?crid=8X63ANHQLSW1&keywords=3+inch+props&qid=1565771521&s=gateway&sprefix=3+inch+prop%2Caps%2C134&sr=8-7
These are 3052 www.amazon.com/GEMFAN-Propeller-Quadcopter-Drone%EF%BC%88Black-Transparent%EF%BC%89/dp/B07DCLG82R/ref=sr_1_4?keywords=3+inch+props&qid=1565771648&s=gateway&sr=8-4
The 3024's look FAR more pitched than the 3052's do they not? Maybe it's just an illusion? It looks pretty clear though.
I so wish you had a real propeller in your hand for this explanation.
ehh, mate, tell me where you live so I can buy you a pint!!!
lol thanks mate :)
Maybe you can make a video about contingency fuel and flight planning? When to use in the calculations? Because some of the questions are really misleading...
I dod one on fuel already if you have a wee look, i think its pretty clear :)