v0.3.0 issues
-
@szymek2392 I made some modifications to the TAS scale textures, see https://community.justflight.com/topic/1902/fixed-tas-scale
-
@sdvpilot Just started cold and dark on the runway at Lee-on-the-Solent, everything off but with the prop turning (live weather, runway heading 230, wind from 228 at 28kts). With the prop still turning I changed the weather to a preset and the prop stopped immediately, which appears to confirm that it is the wind causing this.
EDIT: Exited the sim and restarted in the same place with the same conditions but with the engine running. Shut down and the prop kept turning. Changed weather to a preset again and the prop stopped turning. So yes, it's definitely the wind causing this. As you said, it appears to be an MSFS issue, apparently due to propeller effects not being correctly modelled in MSFS.
-
@Sender46 That is very interesting because I also tried experimenting with wind direction and speed but I could not get the prop to spin on the ground with a dead engine unless the wind was around 100 knots and even then the plane did not rock from side to side as it did when I experienced the. shutdown issue. With a headwind at that speed I expected the plane to lift off the ground but it did not. I could sure hear that wind blowing at that speed. So I am pretty sure it was being simulated. I even started and then shut down the engine several times with around a 50 knot wind vlocity from several different directions and each time the prop stopped spinning. So I could not reproduce the problem. However I did not do this under live weather conditions so that may also be a very strange factor. I will have to try it again on a live windy day.
-
I also experienced this on other aircraft while using LIVE weather, with moderate winds.
-
@RetiredMan93231 said in v0.3.0 issues:
The only other major issue that I have found remaining in this otherwise outstanding aircraft is the overly sensitive rudder and nosewheel steering, making it extremely difficult to maintain the runway centerline during takeoff. This problem is common in many of the default aircraft as well, which implies that it is partly due to the basic MSFS flight modeling. But, it can be largely corrected by making the following recommended parameter changes in the flight_model.cfg file...
[CONTACT_POINTS]
min_available_steering_angle_pct = 0.1 ;0.2 ; Defines the percentage of steering which will always be available even above max_speed_decreasing_steering (in percent over 100).[FLIGHT_TUNING]
rudder_effectiveness =0.2 ;0.7After more testing, here are some better nosewheel settings that will improve the taxi steering, without negatively impacting the previously recommended takeoff steering improvements...
[CONTACT_POINTS]
max_speed_full_steering =20 ;10
max_speed_decreasing_steering = 30 ;20
min_available_steering_angle_pct = 0.1 ;0.2[FLIGHT_TUNING]
rudder_effectiveness =0.2 ;0.7 -
@Sender46 I was finally able to repeat the prop spinning on a dead engine when facing into a 30 knot wind in live weather. Can't blame this behavior on Just Flight because this was happening in the stock G36 Bonanza. However the prop did not spin when I switched over to preset weather with the wind set to essentially the same velocity and direction. The wind sock looked about the same as it did in live weather but the prop did not spin. This crazy behavior along with several others I have found reminds me to face and accept the fact that as realistic as MSFS has become it is a simulation and not the real world!
I took screenshots of both situations but I can't seem to upload them to this post. -
@sdvpilot Interesting. I took it a step further. With live weather, everything off and the prop turning I changed to a weather preset and the prop stopped as before. Then I changed back to live weather expecting the prop to turn again but it stayed stopped. I guess we'll just have to wait for Asobo to fix this. I'm thinking it's probably not very high on their priorities.
-
@Sender46 I also went back and forth between live weather and preset weather. The prop stopped on preset weather with the same wind direction and velocity that was present in live weather. It started spinning again each time I went back to live weather. It may be a case of just how much wind is blowing in live mode which we really can't control. In my test the live wind was 30knots or more. I used the world map wind filter to find windy airports. The fact that the prop reacted differently with what should be the same wind condition illustrates to me just how unrealistic that behavior is in both weather modes.
-
Another issue I just found:
For some reason reduction in prop pitch causes a massive reduction in airspeed. Going from 2700 RPM to 2400 RPM causes a loss of about 25 KIAS. From my experience IRL the difference between 2700 all the way down to 2400 RPM is measured in single digit knots. In my case I was at 3,000' on an ISA day in the sim and went from full prop to 2400 RPM and saw 125 KIAS drop to 100 KIAS (GS, and thus TAS also dropped accordingly).
If we look at the Arrow POH performance charts we find that reducing prop RPM from 2500 to 2200 results in approximately a 10% power reduction for a given manifold pressure setting. If we check the charts for 75% power and 65% power at 3,000' at 9°C we find that 75% power gives about 134 KTAS while 65% power gives about 126 KTAS. A difference of 8 KTAS (this would be slightly less than 8 KIAS). The benefit of the constant speed prop is the increased efficiency that allows for better fuel economy at low prop RPM. It is important that we can reduce the prop RPM without losing much speed or this effect is nonexistent. It should also be noted that I was leaned for best power per the POH of about 100° F rich of peak.
-
@crow said in v0.3.0 issues:
Another issue I just found:
For some reason reduction in prop pitch causes a massive reduction in airspeed. Going from 2700 RPM to 2400 RPM causes a loss of about 25 KIAS. From my experience IRL the difference between 2700 all the way down to 2400 RPM is measured in single digit knots. In my case I was at 3,000' on an ISA day in the sim and went from full prop to 2400 RPM and saw 125 KIAS drop to 100 KIAS (GS, and thus TAS also dropped accordingly).
If we look at the Arrow POH performance charts we find that reducing prop RPM from 2500 to 2200 results in approximately a 10% power reduction for a given manifold pressure setting. If we check the charts for 75% power and 65% power at 3,000' at 9°C we find that 75% power gives about 134 KTAS while 65% power gives about 126 KTAS. A difference of 8 KTAS (this would be slightly less than 8 KIAS). The benefit of the constant speed prop is the increased efficiency that allows for better fuel economy at low prop RPM. It is important that we can reduce the prop RPM without losing much speed or this effect is nonexistent. It should also be noted that I was leaned for best power per the POH of about 100° F rich of peak.
I noticed this too. Something is very wrong with the prop rpm/power simulation.
-
@retiredman93231 said in v0.3.0 issues:
@RetiredMan93231 said in v0.3.0 issues:
The only other major issue that I have found remaining in this otherwise outstanding aircraft is the overly sensitive rudder and nosewheel steering, making it extremely difficult to maintain the runway centerline during takeoff. This problem is common in many of the default aircraft as well, which implies that it is partly due to the basic MSFS flight modeling. But, it can be largely corrected by making the following recommended parameter changes in the flight_model.cfg file...
[CONTACT_POINTS]
min_available_steering_angle_pct = 0.1 ;0.2 ; Defines the percentage of steering which will always be available even above max_speed_decreasing_steering (in percent over 100).[FLIGHT_TUNING]
rudder_effectiveness =0.2 ;0.7After more testing, here are some better nosewheel settings that will improve the taxi steering, without negatively impacting the previously recommended takeoff steering improvements...
[CONTACT_POINTS]
max_speed_full_steering =20 ;10
max_speed_decreasing_steering = 30 ;20
min_available_steering_angle_pct = 0.1 ;0.2[FLIGHT_TUNING]
rudder_effectiveness =0.2 ;0.7Hi, can u confirm please if the file flight_model.cfg it is in the new update? i cant fin it.
-
@jdelites The flight_model.cfg file should be there... it is present on my system. I recommend that you download and reinstall the current version (version 0.10.3) of this aircraft. I do not recommend making any of the previously recommended changes for version 0.3.0, which no longer apply to the current version.
