PDA

View Full Version : For People that know about airplanes.



XyZspineZyX
08-10-2003, 08:04 AM
OK I have a few questions about IL-2 FB. It is hard to find out about alot of the technical questions for aircraft.



1. How does the mixture in the engine affect the aircraft. Does haveing it to high or to low have any bad affects on the engine.

2. How does prop-pitch affect the aircraft. Does it make it overheat faster, give it more thrust, or have any affect at alttitude.

3.What do magneto's do. I haven't used them at all yet.

4.What are the setting for cruising at a fast speed without overheating in the Bf-109E-4. Such as prop-pitch, mixture, throttle and radiator.


Answers to these questions would be very much appreciated. And I thank you for the time in answering them.

XyZspineZyX
08-10-2003, 08:04 AM
OK I have a few questions about IL-2 FB. It is hard to find out about alot of the technical questions for aircraft.



1. How does the mixture in the engine affect the aircraft. Does haveing it to high or to low have any bad affects on the engine.

2. How does prop-pitch affect the aircraft. Does it make it overheat faster, give it more thrust, or have any affect at alttitude.

3.What do magneto's do. I haven't used them at all yet.

4.What are the setting for cruising at a fast speed without overheating in the Bf-109E-4. Such as prop-pitch, mixture, throttle and radiator.


Answers to these questions would be very much appreciated. And I thank you for the time in answering them.

XyZspineZyX
08-10-2003, 08:43 AM
http://www.avweb.com/news/columns/182104-1.html

Turbo mixture info


http://www.avweb.com/news/columns/182082-1.html

Props


http://www.avweb.com/news/columns/182146-1.html

Index


1.On planes that actual have mixture modeled in the game 0 mixture causes the engine to stop running. 120 mixture caused the engine to pour out smoke from the exhaust on some planes.

2.The game does not model prop pitch the same on each plane. It differs considerably. Changes in prop pitch can improve performance, how depends upon the particular plane bing modeled.

3.Magneto's generate the electricity needed for ignition.
Turn them off and the engine stops (at least in the 109s)


4.Best cruise settings are different from plane to plane.
The 109F4 can tool around at 95 throttle on auto pitch with radiators off auto and closed without overheating.





JG14_Josf

XyZspineZyX
08-10-2003, 11:07 AM
Yellow14150 wrote:
OK I have a few questions about IL-2 FB. It is hard
to find out about alot of the technical questions
for aircraft.
Ok I am a Aircraft Licenced Engineer so i will attempt to answer your questions for you simply and in an easy to understand format.


1. How does the mixture in the engine affect the
aircraft. Does having it to high or to low have any
bad affects on the engine.

Ok to run efficently an engine needs to burn fuel and air at a set ratio, it is about 0.07 to 0.08 pound of fuel per pound of air. On an Aircraft this is then set to run a little richer, Ie it has more fuel added, the reason being the excess is used to cool the engine top end and prevent detonation (Premature Ignition). As you climb the Air gets thinner so the amount of Oxygen in your pound of air reduces, you therefore need to reduce the amount of fuel to maintain the ideal ratio, that is the MAIN purpose of the Mixture Control. Over fuelling will result in black smoke, fouling of the plugs and a drop of power, the more serious is running it to lean, this can result in detonation which causes damage to the pistons and head due to it firing as they are still coming up and not on the power stroke when they are going down. It also is a massive explosion on top of them, not a smooth burning process you want, it is also refered to as knock and can results in burnt valves, damaged pistons, head and a damaged exhaust systems as well, but running it slightly lean at the optimum would raise the rpm a little and the power but is not good for it.


2. How does prop-pitch affect the aircraft. Does it
make it overheat faster, give it more thrust, or
have any affect at altitude.

Ok a prop has an optimum angle of attack for a given forward speed, as the aircraft accelerates past that given speed it in effect reduces the angle of attack of the advancing blades and reduces the thrust being produced, by being able to vary the angle you can correct this and maintain the maximum thrust over a wider speed band. Overheat isn't an issue really but, over revving can be as if you have it at a finer pitch than desirable there is less drag or "bite" from the prop as it cuts the air so it revs faster, similar if its to course it slows the engine down and makes it work harder, that can get it hot.

Modern Aircraft you set the RPM you desire with the Prop lever then when you accelerate the throttle it stays at the same RPM speed but through the CSU ( Constant speed unit) for the prop it varies the pitch and hence the power output.

3.What do magneto's do. I haven't used them at all
yet.

Ok a magneto... easiest way to approach this, it is an independant ignition source for the engine, it's engine driven and produces a high energy ignition source or spark.
The beauty of a Magneto is you can turn all electrics off in the aircraft, even remove the battery and it will still run the engine as it needs no outside help to produce the spark.As long as she is turning, she will remain burning /i/smilies/16x16_smiley-happy.gif

You have 2 of these independant ignition sources on your engine and each cylinder has 2 plugs for an efficent burn ratio of the fuel, the reason being if one packs up you do not want to be sitting at 5000 feet with no engine ignition.
Also you might have heard of MAG Drop, ok, this is where one spark plug fails or gets fouled, ie a whisker of carbon builds up across the gap so the spark does not have to jump across the plug gap to get to ground, it simply crosses tha carbon bridge and does not spark. This causes a mag drop, as we said earlier the 2 plugs produce an optimum burn of the fuel, take on out of the equation and that cylinder now is running rich and you will notice a cough and power drop of about 50 rpm over the other mag when you select that mag only in the cockpit, say its a 6 cylinder engine, well its running on 5 1/2.

To cure this when its running provided the build up of carbon is not a lot you can lean the engine right off and deliberatly get it hot, this can cause the carbon to literally burn and clear the plug. The purpose of the mag switches in the cockpit are when you turn a mag off it puts the magneto capacitors to earth and as electricity takes the shortest easiest route it goes that way as opposed to trying to jump the spark plug gap. Oh and at the moment the Mags serve no purpose in the game but to make it authentic.

4.What are the setting for cruising at a fast speed
without overheating in the Bf-109E-4. Such as
prop-pitch, mixture, throttle and radiator.

I cannot help you with this as i dont use he Aircraft in question.

XyZspineZyX
08-10-2003, 01:00 PM
Great run-down on this subject, thanks. As for 109, I normally try to keep it between 2100 and 2500 rpm. If you practice listening to engine revs, you can keep her in the right range, without even looking.

All the best, Don

XyZspineZyX
08-10-2003, 01:18 PM
the other guy's infos contained everythign.

some more things to add:

Bf109F and higher: autopitch, autofuelmixture no need to adjust anything all done automaticly and beter than you could do it yourself.

Bf109F and higher: i don't know what ppl are doing all the time. so many use radiator on auto or leave ti open and wonder when they are slow.

Ok this is what i do:

before takeoff close radiator(not auto, close it), never use flaps on takeoff except you have a really short runway and a 190 with max bombload. if you don't carry bombs NO FLAPS, many ppl do use them cause they see the AI doing it but it's useless all you will do is be slow.
OK radiator closed, flaps up, full throttle keep her down till you are over 220kmh, a nice lift and gear in, you'll have over 300khm after some sec and can climb like hell lol.

The F and G versions don't really need radiator. you'll be way too slow. close it before you take off, keep it closeed when you climb, open it for cruising (position 2 or 4) to cool hwer off a bit when you have nothing to do. when you engage close it again. If you get overheat message open radiator to position2 and reduce throttle to 90% for 3 secs, when enginge is cold again , increase throttle and leave it under 103% she'll not overheat. /i/smilies/16x16_smiley-wink.gif


2 things we need in FB:
The 110 and the desert!!!
http://exn.ca/news/images/1999/04/23/19990423-Me110coloursideMAIN.jpg

XyZspineZyX
08-10-2003, 01:30 PM
Yellow14150 wrote:
- OK I have a few questions about IL-2 FB. It is hard
- to find out about alot of the technical questions
- for aircraft.
-
- 4.What are the setting for cruising at a fast speed
- without overheating in the Bf-109E-4. Such as
- prop-pitch, mixture, throttle and radiator.
-
I started to investigate this myself last week with the help of my Squadron (with thanks to our resident 109 expert,Gilly).Here's the settings that I find best work with the 109 E series.

Throttle: anywhere between 60 and 100%, I prefer it closer to 100%.
Radiator: Recommended setting it to open, but I don't think it really matters.
Fuel Mixture : Full Rich up to 5000ft,Auto rich to 10,000,80% to 15,000 and 60% thereafter.
Prop Pitch : 60% level flight/80% max in a hard climb*/20% or less in a dive.I have found that anything above 80% prop hurts the engine if used for anything more than a few seconds.I tend to keep it at 60% and control the prop RPM in a dive by use of the throttle.

*if you've got a good excess of speed going into a climb with 60% prop you shouldn't need a higher setting.

Hope this helps,if you see N0601_Gilly on HL,don't forget to thank him if you use these settings. /i/smilies/16x16_smiley-happy.gif




-----
In memory of 'The Few'
<img src=http://www.lima1.co.uk/Sharkey/spitfire.jpg>
The Tangmere Pilots - http://www.tangmerepilots-raf.co.uk/
Know your enemy and know yourself; in a hundred battles, you will never be defeated.

XyZspineZyX
08-10-2003, 09:51 PM
well i think we all pretty well covered his request /i/smilies/16x16_smiley-happy.gif well done one and all...

XyZspineZyX
08-11-2003, 05:06 PM
Forget PP after patch as all V 1.1 Emils have auto PP.

I look at it (P) in a different way. WRT mixture - forget it on the 109 no need.

With PP I tend to set it to around 60% in combat and control RPM using throttle. You can dive fine with 60% PP if you just reduce throttle - your choice though /i/smilies/16x16_smiley-wink.gif

WRT Radiators - open radiators cause terribly high drag at higher speeds. When climbing out stick to between 250Kph and 320 Kph (Faster for later & heavier 109's) and keep the radiator at 2 or 4.

When diving close the radiators to maintain speed. Open it again when slow (top of verical move or slow spiral climb) to cool down.

Diving with Rad open will cool engine very quickly - close it ASAP when cool to maintain speed.

JG5_UnKle

"Know and use all the capabilities of your airplane. If you don't sooner or later, somebody who does, will kick your ***"


http://homepage.ntlworld.com/victoria.stevens/jg5_logo.jpg

XyZspineZyX
08-11-2003, 06:25 PM
Great thread! I'm just starting on CEM and this has lots of info-

Cheers,
Cold_gambler

XyZspineZyX
08-11-2003, 08:48 PM
in v1.0 mixture doesn't work for 109's but tommorrow it should be different
as a general technique,in trimmed level flight, try leaning the mixture a notch at a time while watching the rev gauge, watch for a slight drop in revs- you are now just lean of ideal for level cruise- richen it a notch and you are fine. repeat this at various heights (every 1000m?) and note the pecentage for each height.
for combat or manouvering you would probably want to add 1 or 2 notches of mixture upto 100% mixture
hope this helps