CEM Lesson #4 - MP and Superchargers
HTML-код
- Опубликовано: 18 окт 2024
- This lesson teaches you about manifold pressure and superchargers as a lead in video to CEM # 5- Constant Speed Propellers.
Clickable annotations are available which allow you to either watch what you want or replay a section in the video.
Comments and feedback are always welcome, so if this video helped you out hit the like button and let me know in the comments below. Cheers!
"Manifold Pressure". This is one of my favorite lullabies.
Thanks Req ;) You know I needed that.
Cheers Wolfie, glad you liked it mate!
Great stuff, as always!
Nice one Req!
I was googling a few weeks back trying to figure this MP "problem" out.
If I get it right, you can sometime compensate for loss of power by reducing RPM?
Also interested in mixture and mp/rpm coordination for optimal power.
Cheers man!
I'm not sure I read about that anywhere. A reduction of RPM is an indicator of losing power, so I wouldn't think that by reducing RPM further you would suddenly get power back. A propeller gets less efficient as you climb in altitude, and MP falls too, so I think for maximum power you would want to have the highest MP and highest RPM you can combine together without destroying the engine.
I'm sure someone will come along to set me straight if my above assumption is incorrect.
It makes sense.
But (afaik) with old diesel engines when you floor the accelerator you flood the combustion chamber. If you then go off the throttle and start to gradually increase it, you can feel the power coming back.
Very good.
Question though. Why not compressing air at low altitude (use supercharger at low altitude)? If I follow the logic, more air would be allowed for combustion. Combined with lot of fuel, more power would be generated no? Is there anything like sucking too much air in an engine?
You are right with the idea that the more air you can get in, the more fuel you can add, and the more power you can get... but in the case of just turning the second speed of supercharger meant for high altitude down at low altitude it doesn't quite work that way.
The supercharger requires engine power to run, so if you are running the supercharger harder (ie - the next speed) then you are taking away power from the engine to do so. Besides that, engines are designed with a certain maximum air pressure in mind to get their maximum power, and turning on a supercharger at the wrong altitude forces too much air in (increases pressure above optimal maximum), so the engine can't actually use the extra air you are throwing at it anyway. I believe that putting too much air in this way can cause problems for the engine.
The Air Combat Tutorial Library Ok thank you. Keep up the good work!
AT LONG LAST MORE CEM TUTORIALS!!!
Ideally, while flying, should you adjust your RPMs to allow for the maximum amount of MP? If I push the throttle too far the MP will drop, will this give me a corresponding loss in performance?
Oh!, also I would like to make a note for everyone that as you climb and the air becomes thinner, it would be wise to lean out your mixture & increase your prop pitch. You lean out to maintain a good ratio of fuel:air intake, otherwise your motor will overheat quicker as there is too much fuel being injected vs air being taken. This will inevitable cause engine damage and the possibility of completely losing your motor. As for increasing prop pitch as you climb. The air is thinner so you need to increase the pitch at a higher altitude to maintain a constant airspeed. By increasing your prop pitch you are taking a bigger 'bite' of air. Essentially allowing the aircraft to grab more air required to maintain a constant speed and altitude. (sorry for the tangent of sorts, I figured it was relevant in a way to the topic.)
very interesting.
Thanks Jon, glad you enjoyed these and the other vids!
Question: So I heard (from Sheriff's Sim Shack) that high RPM = better acceleration but not best top speed; so why is that?
Also when you reach this best RPM for speed, is that constant regardless of altitude, or does it change whether a higher/lower RPM is recommended depending on your altitude?
So regarding manifold pressure, when you get that to its highest point, is that considered where the engine is performing best? If so, is that in terms of acceleration or top speed?
(current understanding is that max RPM = better acceleration and max Manifold pressure = best top speed)
If manifold pressure is unrelated to the best performance, then what are the practical uses of manifold pressure?
Manifold Pressure in general increases the engines power and should dictate how much the RPM are worth... altough im myself am confused with all that :D
Great video, can you do one where you show off your bindings and maybe share your track ir profile? : )
Already available ;-)
forum.il2sturmovik.com/topic/3625-il-2-bos-tutorials-tir-profile-g940-controls-sweetfx-updated/
IL-2 Tutorials by Requiem oh, cheers : )
Is MP the meaning of "ATA" or "ATA/atm"? I can't find an explanation about it anywhere yet it is somehow crucial for rpm control.
MP/ATA/lbs boost are all different measurements for the same unit. ATA relates to atmospheric pressure
@@RequiemsACTL Well I know it related to atmospheres. But what does 2500 RPM 1.3 ATA actually mean? And how can you read it off the tachometer or ATA/atm meter. I don't understand how to use them
@@bobu5213 If you have an airplane where you can control RPM and MP separately you'll have two controls to use (throttle/RPM control) to attain whatever combination of MP/RPM you need for a given phase of flight. If you're in an airplane such as a Bf 109, for normal engine operation you will just set ATA using the throttle and the RPM will set itself automatically.
What is practical use of this knowledge? (benefits in combat, better usage of aircraft performance).
I didn't want to make the video on Constant Speed Propellers without explaining MP because I figured that I would get asked questions about what MP is. It's just something I thought would be useful for people to know, because it's not uncommon even for real pilots to not know what MP is really about. Think of it as a "the more you know" type of thing.
IL-2 Tutorials by Requiem
also id like to know about mutlistage super and turbo chargers
Yes, with knowledge - more is better. Thanks
Elios0000 there are no multistage super chargers in IL-2 though I thought
Curious if this is just and il2 thing or is this is a real phenomenon. This mp drop during high throttle does not happen in dcs...... turbo or supercharged aircraft.....The RUclips channel Greg's Airplanes covers turbo and gear driven supercharging in airplanes in great detail and this has never come up? Although it would seem extremely relevant in dcs and a RUclips channel centered around wwii supercharged aircraft.
190 next, please?
Yes yes yes, that will be the next one to be released :P I was holding off on completing it because I had a feeling that the 3D models and/or FM would be changed based on evidence provided by the community since its introduction. Today the Fw 190 just received an interior 3D model fix so the Revi is at the correct height and the lower instrument panel is visible, so now I'll do my best to get the Fw 190 familiarisation out as quickly as possible.
As a guess I would say it could be ready by Wednesday.
Many thanks!