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propeller pitch

W

wilevi93

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us-alaska
I have a question about the fixed pitch propeller value in FSX. I notice the value is in degrees, which real world propellers (even ones for model airplanes) measure the pitch in inches of forward motion for every 360 degree rotation. My bigger problem is that increasing the pitch using airwrench doesn't seem to have the desired effect of slowing the engine RPM down at static full throttle. Am I missing something?

Thanks in advance
 
Wellcome to the virtual flight dynamics :) - in some areas they're quite different than the real world.

I presume You are editing an existing aircraft?

Basicaly doesn't make whole lot of difference, but which version of simulator are we talking about?

As far as I know airwrench is application that is editing the *.AIR file, so corresponding Aircraft.cfg file stays intact. Open Aircraft.cfg file with a text editor and look for this:

[propeller]
thrust_scalar=1.00000
propeller_type=0
propeller_diameter=9.00000
propeller_blades=2
propeller_moi=15.348138
beta_max=28.00000
beta_min=12.50000
min_gov_rpm=600.00000
prop_tc=0.00400
gear_reduction_ratio=1.00000
fixed_pitch_beta=12.00000
low_speed_theory_limit=80.00000
prop_sync_available=0
prop_deice_available=0
prop_feathering_available=0
prop_auto_feathering_available=0
min_rpm_for_feather=700.00000
beta_feather=88.50000
power_absorbed_cf=1.000000
defeathering_accumulators_available=0
prop_reverse_available=0
minimum_on_ground_beta=1.00000
minimum_reverse_beta=-14.00000


Value in red is what You'll need to change to observe any difference.

Note that values in Aircraft.cfg take presedence over what is written in pairing *.AIR file. Air file values will only be taken into account if there's no value for the same parameter in Aircraft.cfg.
 
airwrench does calculate the cfg file, I tried changing the pitch manually and with the program with results ranging from nothing to bad. For some reason the engine would go to the proper takeoff power and the same rpm, but the airplane wouldn't roll fast enough to take off.:confused:
I'm using fsx and the aircraft is a light 85hp single engine.
 
Hi
You may need to do some work in the prop tables... 511 512 airfile
Airwrech I think does make some changes in 511 and 512 but not 100% sure. Also watch out for aircraft.cfg changes... things like max mp and compression ratio for some reason get dropped when mucking around inside airwrench engine settings
Wozza
 
Sorry for a misleading post - I only tried air wrench couple of years ago and didn't like what I saw. Maybe also You could start using a combination of AirEd+AAM(Aircraft Airfile Manager).
 
adr179 said:
Sorry for a misleading post - I only tried air wrench couple of years ago and didn't like what I saw. Maybe also You could start using a combination of AirEd+AAM(Aircraft Airfile Manager).
Click to expand...
Hi
Airwrench is great if you dont like the number crunching and if you dont have a phd in maths :)
Only thing is you need to start from a virgin airfile as any previous fudges will cause grief....
What I do is make a text file with nothing in it save it then rename it as a airfile with the correct project name, then fill out as much as I can in the aircraft.cfg fire up airwrench,then check through all the tabs and save.
This should write all the relative info to the blank airfile....not sure if this still works as its been a while since I used airwrench
Wozza
 
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