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View Full Version : Is the 109E porked? Experts opinions needed



Freiwillige
06-27-2008, 12:34 AM
The 109E fly's and fights about what I would expect..... but, the Prop pitch is incredibly slow to react to adjustments and the engine overspeeds and blows quickly, even if you slightly over RPM while fighting with the prop pitch.
And when you put it on auto the RPM is kept so low that its completly gutless. Its like driving a car from dead stop in 3rd gear! I noticed that the other 109's do not have this problem.

So my question is this, did the 109F and later have a differant hydraulic prop pitch system?

WTE_Galway
06-27-2008, 12:54 AM
I always found the simplest way to use manual pitch on an emil was to select a throttle setting for your current situation (for example 60% when cruising and 100% in combat) and then leave the throttle entirely alone and do not touch it - then choose a max rpm you am happy with and work the pitch lever to keep the RPM under that figure.

The two critical times for over-rev are takeoff (do not takeoff with 100% pitch) and diving where even zero throttle can over-rev if the pitch is wrong.

It seems likely the SOW Emil will be manual pitch so it may well be a good skill to pick up.

Freiwillige
06-27-2008, 01:24 AM
Well upon further research ive found out this.
Auto prop pitch systems use a piston and hydralic pressure to adjust the prop pitch. That is the faster the prop spins the more hydralic pressure is created, which in turn pushes on the pistond and increases prop pitch, which in turn bites more air and creats more thrust and drag, which also stops the RPM's from going thru the roof. As the RPM's drop the the pitch returns to normall.

But why is the system different in the 109E vs the 109F and later?

K_Freddie
06-27-2008, 05:28 AM
I usually switch between auto and manual mode in a DF.
When pulling into a climb, I switch into auto and when diving I switch into manual only after the revs reach 2300-2500 rpm.
This way the reaction time is faster and the effects more noticable.
The manual PP setting is anywhere from 60-70%.
When cruising you can go down to 50%.
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Kurfurst__
06-27-2008, 05:50 AM
I wonder if anybody did turn time tests with 109E to check how they match up with German figures (18.92 sec for a 360 degree sustained turn at 990 PS output at 0 meter, corresponding radii 203 meter)?

Smallest turning radii at Sea Level and at 6000 m, with and without deploying flaps to aid turning :

Without use of flaps :
at 0 m altitude - 170 m (557 feet), at 6000 m (19 685 feet) altitude - 320 m (1050 feet).

With use of flaps :
at 0 m altitude - 125 m (410 feet), at 6000 m (19 685 feet) altitude - 230 m (754 feet).

luftluuver
06-27-2008, 06:09 AM
Originally posted by Kurfurst__:
I wonder if anybody did turn time tests with 109E to check how they match up with German figures (18.92 sec for a 360 degree sustained turn at 990 PS output at 0 meter, corresponding radii 203 meter)?

Where were these turn tests done?

BOA_Allmenroder
06-27-2008, 08:19 AM
Go to Shockwave Productions and see their ME 109 E for MS Flight Simulator.

Has a nice checklist of where to position the prop for various flight regimes. The checklist also has the order in which you adjust ATA v Prop position: ie which lever you move first depending upon adding/decreasing power.

Freiwillige
06-27-2008, 07:01 PM
But that still doesnt explain why the F model is so differant the the E model in game. The F-2 has the same Engine as the E-4. So why the disparity between the two on manual pitch?