Prop Pitch question...

[II./JG1_Krupinski]

Originally Posted by Rama

It is IN GAME, when kommandogerät is OFF (once you set the automatism off).
When automatism is on, then of course the kommandogerät drives the pitch along with mixture, turbo, etc....

kommandogerät is not a CSP, CSP will maintain a constant engine rpm regardless of throttle.(within reason)

This is not true with kommandogerät. Reduce your throttle, your RPMs will also reduce.

kommandogerät is really just an automatic VPP system tying pitch and throttle to rpms.

-Raven

[Rama]

Originally Posted by II./JG1_Krupinski

kommandogerät is not a CSP, CSP will maintain a constant engine rpm regardless of throttle.(within reason)

This is not true with kommandogerät. Reduce your throttle, your RPMs will also reduce.

kommandogerät is really just an automatic VPP system tying pitch and throttle to rpms.

-Raven

You're absolutly right.... but it doesn't contradict what I said
Read what I said.... I never said Kommandogerät is CSP.

When Kommandogerät is ON, then it manage the whole stuff (including pitch)
BUT.... when Kommandogerät is OFF (one you turned it OFF), THEN (and only then) Pitch is CSP controlled.
Try it in game, first turn the kommandogerät OFF, then you will see RPM will be fixed for a given position of the PP lever.

[II./JG1_Krupinski]

Originally Posted by Rama

When Kommandogerät is OFF (one you turned it OFF), THEN (and only then) Pitch is CSP controlled.

On or off, the 190 is never a CSP. CSP maintains a constant engine rpm regardless of throttle setting (within reason). That is why it's called constant speed propeller.

Again, reduce your throttle (Kommandogerät OFF) and your RPMs reduce. That is NOT CSP that is VPP.

[Rama]

Originally Posted by II./JG1_Krupinski

On or off, the 190 is never a CSP. CSP maintains a constant engine rpm regardless of throttle setting (within reason). That is why it's called constant speed propeller.

Again, reduce your throttle (Kommandogerät OFF) and your RPMs reduce. That is NOT CSP that is VPP.

You obviously haven't tried with Kommandogerät off..... try and you'll see I'm right (reduce or increase throttle, and RPM wont move).
I'm of course talking in game, not real.

[BSS_Sniper]

Thanks Rama for the clarification. BTW, what type aircraft to you fly in real life?

[Vidar_710]

Ironman has given great advise for Prop Pitch Managment for gaming IL2. IRL you would burn out an engine in no-time-at-all with these techiques.

Roma also had terrific advise for saving a bad engine. Again, useless IRL, however; Throttlinge back to 70% and bringing my prop pitch back to about 80% gives me more flight time with a crippled engine... My training as a pilot and a flight instructor has ingrained into my brain bucket to never exceed Manifold Pressure over Prop Pitch, so I follow that rule in-game too. It saves me from transfering bad engine management techiques into RL.

Example how Prop pitch should work in-game - HIGH SPEED DIVES:

Prop Pitch should be full forward to prevent over-speeding the airframe. Sounds confusing to some, I know, but here's why.

Dispite the High RPM pitch, this setting flattens the blade angle. The Govenor will prevent over-speeding the engine. The flat plane of the spinning prop now acts as a huge spinning speed-brake.

Great thread gents!

S!

\/

[Rama]

Originally Posted by BSS_Sniper

Thanks Rama for the clarification. BTW, what type aircraft to you fly in real life?

Robin DR-400 (fixed pitch) and Aquila AT01 (CSP)

[II./JG1_Krupinski]

Originally Posted by Rama

You obviously haven't tried with Kommandogerät off..... try and you'll see I'm right (reduce or increase throttle, and RPM wont move).
I'm of course talking in game, not real.

I do so exclusively, here are two tracks one with a CSP (P51) and one without (190A9). You will see changes in throttle do not change RPMs in the 51 (auto OFF) while changes to throttle in the FW produces engine RPM differences of 300 RPM or more between 2300 and 2600 RPM.

http://www.fly-eaglesnest.com/downloads/FW190A9.ntrk
http://www.fly-eaglesnest.com/downloads/P5120DNA.ntrk
http://www.fly-eaglesnest.com/downloads/CSPvVPP.zip

The zip file is just both files zipped up and all are provided in case of file corruption of the zip.

While there are minor fluxuations in the RPM of the P51, that's to be expected: Reasoning the engine is producing more power faster than the hydraulic system can adjust for, but it does definitely settle and maintain engine RPM, 2650 I believe: Even down to about 50% power.

On the other hand, the FW setting of 40% pitch (Auto = OFF) is turning about 2600 RPM @ 100% throttle. Reducing throttle in this case reduces engine RPM; @ about 70% throttle ~2300 RPMs. Definitely NOT a Constant Speed Propeller since by definition a CSP maintains a constant engine rpm.

-Raven

[na85]

Okay, I would very much appreciate if someone can clear up some of my questions:

If I'm in an American plane (p47, p51) and I want good level acceleration, should I be at about 80% pitch or so or should I do 100%?

If I'm in the same plane and in a hurry to get somewhere, or to get away from someone, should I be at 100% pitch, 110% throttle? Or should I be at lower pitch?

Does the same thing apply for Russian planes and FW190's (in manual mode)? (I'm aware the 109 has a different manual pitch system)

Thanks

[BSS_Sniper]

Originally Posted by na85

Okay, I would very much appreciate if someone can clear up some of my questions:

If I'm in an American plane (p47, p51) and I want good level acceleration, should I be at about 80% pitch or so or should I do 100%?

If I'm in the same plane and in a hurry to get somewhere, or to get away from someone, should I be at 100% pitch, 110% throttle? Or should I be at lower pitch?

Does the same thing apply for Russian planes and FW190's (in manual mode)? (I'm aware the 109 has a different manual pitch system)

Thanks

If you want good response and acceleration use 100% prop pitch. Anything else is just for cruise, cooling the engine or diving faster and holding your E a bit longer when you level off.