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Are you using Developer Mode or made changes in it?
No
Have you disabled/removed all your mods and addons?
Yes
Brief description of the issue:
Maintaining taxi speed is difficult in the ATR due to characteristics of the flight model. The aircraft naturally gains speed with the power levers in the Ground Idle position. Moving towards reverse, even slightly, causes the aircraft to stop abruptly, however exiting reverse happens slowly and sometimes there is an abrupt drop in NP causing the AC Wild system to go offline (you get a bunch of annunciations because of this). Adding even a little power above ground idle causes the propellers to rev to 100% NP. None of this is realistic for a turboprop, but practically-speaking it makes the ATR difficult to taxi in the sim.
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PC specs and/or peripheral set up if relevant:
Build Version # when you first started experiencing this issue:
1.32.7.0
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Do you have the same issue if you follow the OP’s steps to reproduce it?
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Reported something similar: ATR - Can't steer right when the left engine is off
The plane has weird ground handling effects. Also agree with your findings re: reverser. That behaves very erratically too
Do you have the same issue if you follow the OP’s steps to reproduce it?
I have done more research on the Pratt & Whitney PW1xx series engines, and it seems that this engine series’ EEC incorporates a taxi/ground operation mode (“bottom governing”) that maintains or limits the prop RPM while the Power Levers are in the normal ground range. Bottom governing means that governor operation is reversed, so RPM is maintained by fuel flow, and the PLs control beta (positive AND negative beta). This is also typical of other turboprops in the commuter category, and larger.
Basically, the MSFS ATR’s engines will rev the prop RPM to 100% with a small power increase during taxi and this is not realistic. Prop RPM should be maintained around the ~72% mark until the PLs are advanced past a certain mark during taxi and landing rollout.
I have started turning the PWR MGT knobs to CLB while I am taxiing around (limits the NP to 82%). Of course this is not correct, but it makes taxiing much smoother because you are not dealing with big surges of prop RPM between 72% and 100%.
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Do you have the same issue if you follow the OP’s steps to reproduce it?
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The ATR is very difficult to taxi in ground idle it will do 20 kts in idle and one is constantly riding the brakes.
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Fixed in previous update.