mr. idoit as an airline pilot you don’t need to know this information anymore. It’s good information yes, but not necessary to be flying airliners. Also, remember this was 65 years ago and I don’t think constant speed props were a thing yet.
So, when taking off the prop angle is closer to 90 degrees to the ground and once altitude is reached the prop angle is changed towards 45 degrees to take a bigger bite out of thinner air. This keeps the aircraft in the power envelope more optimally. Is that right?
For Turboprops it gets even more complicated. The Dash 8 uses a free turbine to drive the propeller, apparently this is why the blades are flat when the engine is shut down. On the other hand, geared Turboprops use a gearbox to transmit the power, Garrett engines like on a Jetstream 32. These blades have locks which keep the blades at fine pitch for engine starting.
Hi Wren Aviation , Great video, I am putting together a presentation for a CSU Brief, Can i get the portion of the video from 00:45 to 5:15 to insert into a slideshow?
Probably a better analogy is not a conventional automotive automatic transmission, but a CVT transmission or constant velocity. The engine RPMs stay constant while the hydraulically controlled transmission pulleys adjust to the load and speed demands. This is why you feel no shift shock on a CVT.
No, the purpose of an analogy is to compare a foreign concept to something everyone already knows. Whatever you're talking about is comparing a foreign concept to another foreign concept. Your explanation means nothing to a beginner. However, the basics of a car transmission makes sense to someone who has never even been in the cockpit.
Great explaination! I have a hard time figuring out how this "modern" propeller-technology works, but i got a better understanding of the mechanics... Why cant we all just use regular jet engines instead of turboprop and piston engines?
simple: economy and efficiency. Props are very efficient at low speeds, below 300kts. Above that, jet engines shine, especially when the ram-effect at the intake takes place.
Would be interesting to know about the relationship between manifold pressure and prop rpm. When I decrease the rpm, the propeller is harder to turn so the load on the engine goes up and so does manifold pressure? Or am I missing something here? :)
Manifold pressure is the vacuum between throttle and the cyclinders. Closed throttle is more vacuum. Increased throttle, the pressure returns more to atmospheric pressure. With more load, pressure will increase because you need more air/fuel
Can someone explain the propeller vs. engine torque and its relation? I dont get how an increase in propellers pitch (and with that a decrease of the props RPM) increases the propellers torque...
This is the best and easy to understand constant speed propeller explanation I have seen to date. THANK YOU so much!!
I agree 100%
So do I. All of a sudden this seems so easy to understand. Vielen Dank!
@@matrixab4356!
Been a pilot for 65 years and still enjoy learning new stuff
Wait so at the time you've been a pilot.... For your 65 years... This is new stuff to you? The bare bones basics of a constant prop, after 65 years?
mr. idoit as an airline pilot you don’t need to know this information anymore. It’s good information yes, but not necessary to be flying airliners. Also, remember this was 65 years ago and I don’t think constant speed props were a thing yet.
@@airwipe1639 They sure were, a couple good years before 1952!
Daniel Pearson wow! Thought it was new. That’s pretty impressive for the 50s.
@@airwipe1639 The 30s, even :D!!!
Excellent explanation. It's so easy to lose students on the inner workings of the constant speed prop. This just completely makes it clear. Thank you!
One of the best explanations of the high level purpose and workings of a constant speed prop on UA-cam!
Dude. Thank you. I'm studying for my Powerplant rating right now, and this put a lot of alien concepts into a tangible perspective.
Thanks for pulling all this together, finally something understandable on how this all works!
This is the first explanation that made sense regarding fine and coarse pitch. That bit about the relative wind is what I needed explained.
This is the best explanation I have ever hear and seen so far!!! Good work Wren Aviation!!!
Best video I've seen so far on constant speed props.
Great instruction video, thanks you for sharing your knowledge! Student Pilot from Québec, Canada here.
The best video on the subject so far for this nooby. Thanks!
Would you do one for manifold pressure also? I really like the way you explained this.
Read the Commercial Pilot Lesson 1 in MS Flight Simulator X. Rod goes over it very well
it's shows how much air goes into the cylanders. With the throttle, you basically open or close a valve that allows it to flow.
As a student pilot about to begin complex aircraft training I appreciate this video a ton
thankyou , it's very helpful to remember how the constant speed system works.
Damn Fine Video !!
Didn't even know these existed and I actually have a L'il black Log Book with several hours in 3 different planes !
Thank you thank you thank you!
Please make more BASIC aviation videos!
So, when taking off the prop angle is closer to 90 degrees to the ground and once altitude is reached the prop angle is changed towards 45 degrees to take a bigger bite out of thinner air. This keeps the aircraft in the power envelope more optimally. Is that right?
Is this video narrated by a CFI by the name of Clint H? I swear this the voice of my first commercial instructor...
Yes, it is; one of the best CFIs in the Mile High area!
nice presentation - very clear, concise
Thanks now I understand why Dash 8 propellers (twin engine) are always feathered at rest. I thought it would be easier to start up if they were 90°
For Turboprops it gets even more complicated. The Dash 8 uses a free turbine to drive the propeller, apparently this is why the blades are flat when the engine is shut down. On the other hand, geared Turboprops use a gearbox to transmit the power, Garrett engines like on a Jetstream 32. These blades have locks which keep the blades at fine pitch for engine starting.
Excellent presentation...well done!!
Hi Wren Aviation ,
Great video, I am putting together a presentation for a CSU Brief, Can i get the portion of the video from 00:45 to 5:15 to insert into a slideshow?
U really have deep knowledge...in this #the_best_vdo_explained_ ❤👍
This is great! Thanks!
Probably a better analogy is not a conventional automotive automatic transmission, but a CVT transmission or constant velocity. The engine RPMs stay constant while the hydraulically controlled transmission pulleys adjust to the load and speed demands. This is why you feel no shift shock on a CVT.
No, the purpose of an analogy is to compare a foreign concept to something everyone already knows. Whatever you're talking about is comparing a foreign concept to another foreign concept. Your explanation means nothing to a beginner. However, the basics of a car transmission makes sense to someone who has never even been in the cockpit.
Great explanation, cheers!
Great explaination! I have a hard time figuring out how this "modern" propeller-technology works, but i got a better understanding of the mechanics... Why cant we all just use regular jet engines instead of turboprop and piston engines?
😏
simple: economy and efficiency. Props are very efficient at low speeds, below 300kts. Above that, jet engines shine, especially when the ram-effect at the intake takes place.
Very well explained, thank you!
Fantastic explanation.
Solid video, smooth voice
Would be interesting to know about the relationship between manifold pressure and prop rpm.
When I decrease the rpm, the propeller is harder to turn so the load on the engine goes up and so does manifold pressure? Or am I missing something here? :)
Manifold pressure is the vacuum between throttle and the cyclinders. Closed throttle is more vacuum. Increased throttle, the pressure returns more to atmospheric pressure. With more load, pressure will increase because you need more air/fuel
so do you fly at full throttle with such a prop?
pretty good video. so awesome
Meeting at marigold hptel
Clear and concise
Can someone explain the propeller vs. engine torque and its relation? I dont get how an increase in propellers pitch (and with that a decrease of the props RPM) increases the propellers torque...
torque is basically the "drag" you create by generating Lift with the propeller. that's the simpliest form you can get as an explanation.
Great video, thank you
Are flyweights and counterweights the same
ive got 58 hours to go before i get my cpl. this is a simple video.
Good pm s>r
Awesome ! `Thanks man.
Thank you!
Thanks.
Thank you
No more vids? 😣
I wonder if jet engine will change the pitch too...