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XyZspineZyX
09-02-2003, 01:27 AM
If someone would be so kind as to explain in simple terms what prop pitch does and how it affects the performance of the aircraft. I tried to do a search in these forums but it wasn't working and after poking around on the internet was only able to find mathmatical explanations. I recently got an X45 and now that I can easily control prop pitch, I would like to know what it is for.

Thanks in advance.

XyZspineZyX
09-02-2003, 01:27 AM
If someone would be so kind as to explain in simple terms what prop pitch does and how it affects the performance of the aircraft. I tried to do a search in these forums but it wasn't working and after poking around on the internet was only able to find mathmatical explanations. I recently got an X45 and now that I can easily control prop pitch, I would like to know what it is for.

Thanks in advance.

XyZspineZyX
09-02-2003, 01:32 AM
I believe what it is is this. The angle of the blades on the propeller are pitched at a certain angle. When you ajust this, it makes the angle bigger/smaller. This will affect the plane handling but to what extent, I don't know.

Beta tester for;
C&C Generals,Independance War 2, Starfleet Command 2,Settlers IV, Tzar, Allegiance, Starfleet Command,MAX 2, Defiance

XyZspineZyX
09-02-2003, 01:45 AM
Greetings.
Prop pitch is related to the angle of attack that the airfoil(prop) has to the oncoming airflow. Fine pitch is where the prop blades are almost at a 90 deg. angle to the oncoming airflow where Coarse Pitch is almost where there is no resistance to airflow(feathered)as far as the airflow past the prop is concerned.

However, fine pitch can be described as 1'st gear in an engine where as coarse pitch is like 4'th gear.
Fine pitch is used at take-off and as airspeed increases you can increase pitch towards coarse.
Try it out yourself. Try taking off with pitch fine and see how long it takes to get off ground then try it with coarse. You'll accelerate faster with fine. But, when you get up to speed you need to increase the pitch towards coarse to keep the engine from overspeeding and to keep the airflow flowing past the cowling.
Good luck, there is a lot of tech data out there to support my ramblings and probably more understandable.http://ubbxforums.ubi.com/infopop/emoticons/icon_smile.gif
hobiewan

XyZspineZyX
09-02-2003, 02:01 AM
I really like you analogy of the gears. Now that I put that in perspective I can really notice a differance in performance where as before I was thinking prop pitch was something aken to elevator trim and was not noticing a differance. In watching the training vids within the game, I notice that the demonstrating pilot is changing prop pitch quite a bit, especially on the bombing demo. So if I understand the explinations correctly a practical application of prop pitch would be to go to a coarce pitch during a dive as to decrease the pull my engine would have though the air, thus decreasing my airspeed, but not my RPM?

Thanks for such quick answers.

michapma
09-03-2003, 09:55 PM
From what I've heard Jeff Gerhardt has done a good job of explaining some basic concepts of engine management for FB in easy-to-understand terms:
http://mywebpages.comcast.net/Tailspin/documents/CEM_IL2FB.htm

There are lots of other great resources for in general at Tailspin's site, start under Basics:
http://mywebpages.comcast.net/Tailspin/index.htm

Here's another thread where some explanations are made:

http://forums.ubi.com/messages/message_view-topic.asp?name=us_il2sturmovik_gd&id=zadao

Have fun,
Mike

<table width="100%" border="0" cellspacing="0" cellpadding="10"><tr valign="middle" bgcolor="#3e463b"><td height="40" colspan="3" align="center">The ongoing IL-2 User's Guide project (http://people.ee.ethz.ch/~chapman/il2guide/)</a></td></tr><tr bgcolor="#515e2f"><td width="40%">FB engine management:
Manifold Pressure sucks (http://www.avweb.com/news/columns/182081-1.html)
Those Marvelous Props (http://www.avweb.com/news/columns/182082-1.html)
Mixture Magic (http://www.avweb.com/news/columns/182084-1.html)
Putting It All Together (http://www.avweb.com/news/columns/182085-1.html)
Those Fire-Breathing Turbos (Part 1 of 6) (http://www.avweb.com/news/columns/182102-1.html)</td><td align="center">

‚ =69.GIAP=Chap‚

69.GIAP (http://www.baseclass.modulweb.dk/giap/)</p></td><td width="40%" align="right" valign="top">Hardware:
Flight Simulation Performance Analyzed (http://www.simhq.com/_air/air_062a.html)
Building a home-made throttle quadrant step by step (http://forums.ubi.com/messages/message_view-topic.asp?name=us_il2sturmovik_gd&id=zkavv)
Sound Can Be Hazardous for Games (http://www6.tomshardware.com/game/20030405/index.html)</td></tr></table>