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View Full Version : auto prop pitch and the 109s



mike_espo
02-17-2004, 07:08 AM
I fly the 109 alot. I use both manual and auto prop pitch. In all the variants, I have found that it accelerates better with auto on. I am not sure of climb rate. What do you 109 drivers think? I may be doing something wrong. When manual, I try to keep the emil in the 2500 range, the other 109s around 3000 for optimum performance. I find though that I accelerate better when I turn on the auto pitch, then the speed shoots up....

thanks

mike_espo
02-17-2004, 07:08 AM
I fly the 109 alot. I use both manual and auto prop pitch. In all the variants, I have found that it accelerates better with auto on. I am not sure of climb rate. What do you 109 drivers think? I may be doing something wrong. When manual, I try to keep the emil in the 2500 range, the other 109s around 3000 for optimum performance. I find though that I accelerate better when I turn on the auto pitch, then the speed shoots up....

thanks

Zen--
02-17-2004, 08:33 AM
Thats very interesting information. I would have thought it was the other way around, especially after the months of debate on the advantages gained by using manual instead of auto.

I have pretty much stopped flying the 109's myself so can't comment directly on this, but it seems to me that in the FW series, better performance is gained in manual, in particular the D9.


I'd be interested to hear what other 109 drivers think also.

-Zen-
Formerly TX-Zen

bodaw
02-17-2004, 08:37 AM
Hi, I find the manual prop pitch accelerates faster for me. I'd have to do more testing to be sure though. And also it overheats alot quicker with the auto prop pitch, atleast for me. Will do some tests as soon as I get home.

aerick2
02-17-2004, 09:52 AM
I'm not sure about acceleration, but I can pull off one hell of a zoom climb with manual pitch!

F19_Ob
02-17-2004, 12:30 PM
<BLOCKQUOTE class="ip-ubbcode-quote"><font size="-1">quote:</font><HR>Originally posted by mike_espo:
I fly the 109 alot. I use both manual and auto prop pitch. In all the variants, I have found that it accelerates better with auto on. I am not sure of climb rate. What do you 109 drivers think? I may be doing something wrong. When manual, I try to keep the emil in the 2500 range, the other 109s around 3000 for optimum performance. I find though that I accelerate better when I turn on the auto pitch, then the speed shoots up....

thanks<HR></BLOCKQUOTE>



Im also testing manual proppitch and cant get more performance than I do with autosettings......not yet anyway.

I have said it before....The Finns only used autosettings and they were excellent flyers.
-----------------------------------------------

I have been trying to find info about how it was used by the german pilots......I have a vague memmory of reading (long time ago)that autosettings was the norm on everything with "auto", exept for the radiator wich was fully open when taxiing and takeoff and then switched to auto for rest of time.

anyone else got something about this?

BlindHuck
02-17-2004, 12:50 PM
My (infallible http://ubbxforums.ubi.com/images/smiley/16x16_smiley-wink.gif ) wreckollection is RL pilots used manual control as emergency backup. Auto control included MAX performance setting at full throttle http://ubbxforums.ubi.com/images/smiley/16x16_smiley-indifferent.gif not easy to improve on. MAX performance was relatively easy to dial in on auto controller, efficiency in cruise was much more difficult.

All German electric props were featherable, also. Not sure if this is modeled. It would be nice if there were a feather graphic. http://ubbxforums.ubi.com/images/smiley/16x16_smiley-happy.gif

"I race full real exclusively in IL2:The Forgotten Battles." - Mark Donohue

georgeo76
02-17-2004, 02:27 PM
Manual prop pitch is too much trouble. The only time I use it is sometimes when landing, I set the pp to 100% while the throttle is @ 0%, kinda like a speed brake.

The biggest advantage of auto-settings is it allows the pilot to spend more time 'outside' the pit than 'inside'. The less your pilot has to fool around w/, the more time you can devote to SA.

http://webpages.charter.net/Stick_Fiend/images/buck2.gif
"I don't think it's quite fair to condemn a whole program because of a single slip-up. "
Fiend's Wings (http://webpages.charter.net/Stick_Fiend)

JG27_Dacripler
02-17-2004, 02:59 PM
Some guys have great reflexes in mastering pitch and are at a certain risk by shortening a flight with a quickly burnt motor..( I can attest to this as I cannot effectively use it well) I just turn my auto pitch on and let it go from there. I have prop pitch mapped on a slider and it is effective in adjusting the pitch in smaller increments without bursting the motor in an instant. Although, I have a 100% setting and Auto as my backup.. I will use auto about 90% of the time unless I need the extra "dose" of overrev to get me out of a situation. I will pop the button for a sec and quickly go back to auto and repeat.. It works pretty good. Unfortunately I have burned motors doing this as well...
In later series 109s it it much more noticible using the "W" key as it already gives the motor the extra boost..
My typical flight with a later series 109 (BF109-G10) I will throttle to zero. push "w" then "i" to start my motor. My settings already have my prop at auto from the start. One of the hidden features built into the game is the "bad motor" and I'm sure the 109 guys will attest to the phenomenon. (Start off with a fresh airplane and use the sequence above) Only to find out your motor is burned right from the start.

p1ngu666
02-17-2004, 03:36 PM
start, wait for smoke to clear, bung on wep
no/less chance of motor burn http://ubbxforums.ubi.com/images/smiley/16x16_smiley-wink.gif

http://www.pingu666.modded.me.uk/mysig3.jpg

JG14_Josf
02-17-2004, 04:35 PM
BlindHuck,

Can you elaborate on the German prop feathering capabilities?

I've read the Finnish G2 manual from this page:
Bf109.com (http://www.bf109.com/frameset.html)

Examples:

3. Operationg the blade pitch control

1) In flight the blade pitch control should be kept in the automatic position if possible.

2) Warning: If you set the aircraft into a dive from all-out level flight or quickly apply full throttle in flight, you will be dangerously close to over-revving the engine.

3) While descending, the engine idling and your speed is less than 200 kph, you must set the blade pitch control to manual or closely monitor that the airscrew pitch does not get too low (over 12 o'clock)

4) Manual setting must be used:

When flying with the economy cruise setting, and the engine RPM and boost pressure are at the recommended values. You must set the pitch control to automatic before you start diving.

When flying with 0 airscrew pitch (descent setting), or if the governor fails.

5) If you fly with manual pitch control, you must ensure that you do not set the airscrew pitch lower than 12 o'clock because the emergency release will not engage before the 12:30 position.

The airscrew pitch must be set so that the given RPM and boost presure can be reached.



And...


Emergency landing:

Set the pitch control to "manual" and airscrew pitch to 0 (glide).



So...

Can you please explain this "Feathering" feature a little better?

Does the setting "0 pitch" correspond with a full coarse pitch parrallel with the roll axis or perpendicular with the prop disc?

Is this "0 pitch" setting lower than 12 o'clock?

What is the emergnecy release that will not engage before the 12:30 possition?

From this web page:
avweb.com (http://www.avweb.com/news/columns/182082-1.html)

Consequently, the full-feathering props used on piston twins and certain turboprops are designed with a system of centrifugal latches and pins that lock the blades in a medium-pitch position when the RPM drops below 600 or so, preventing them from going into feather at shutdown. In the event of an in-flight loss of oil pressure, however, windmilling action keeps the prop RPM high enough that the centrifugal latches don't come into play and the prop fails in the feathered position. Pretty clever.

[This message was edited by JG14_Josf on Tue February 17 2004 at 03:46 PM.]