I have the Saitek X52 controls, and the Carenado C-90B tends to taxi far too fast if the Saitek throttle lever ("Power Lever" in Turboprops) alone is used for speed control. This necessitates frequent braking to control the speed, and the usual annoying bobbing up and down during each brake application.
I have seen reports of similar problems with other control hardware.
In my case. the following procedure results in a smooth and easily controlled taxi speed, so I wanted to pass it along. I realize this may not work for everyone, and it depends on using a joystick or control column with a throttle.
First make sure your control settings under "Options" are set as follows:
"Throttle Decrease Quickly", F2 with the repeat slider set at 50%. (This is to allow quick Reversing on Landing)
"Throttle Increase", F3, Repeat slider set at zero.
Procedure: (Parking Brake ON)
1. Propeller Pitch Levers on the pedestal Full Forward.
2. Condition Levers to Low Idle (Just out of Cut-Off)
3. Power Levers (Throttle Lever control on my Saitek) at Idle.
4. Release Parking Brake.
5. SLOWLY increase Power Levers (wait for spool up) until aircraft movement is detected.
Movement should normally start at about 0250 indicated on the digital torque readout unless the nose wheel has to be turned
immediately to avoid colliding with something. In that case it will require more torque.
6. After taxi speed is up to about 5 kts tap the F2 Key (Don't hold it down) to bring the power levers back until the
bottom of the levers are just above the words "Ground Fine" on the console. This is in the "Beta" range between idle and Reverse
Thrust. It should, in most cases result in the taxi speed increasing slowly to about 12 kts, then stabilizing. From here
on tap the F2 or F3 key to adjust the taxi speed as desired with a minimum use of the brakes if required.
Note: On the Saitek, if I move the throttle lever at all during taxi, it goes back up to "Idle" and starts to increase taxi speed excessively. On the real airplane there are "Lift Gates" that allow the F2/F3 thing to be done with the Power Levers alone, but this does not seem to be possible in flight sim.
Editorializing: One of my peeves with the Carenado C-90B is that there are several times when you need to adjust something, but you either cannot see the results while doing the adjustment or cannot see where you are going due to the VC view set-up. This is the case to some extent here, and is even more of an inconvenience while trying to control the pressurization during ascent and descent.-End of Editorial
I realize there are othe ways of doing this, but using the Beta range for taxi speed control is the way the real airplane is controlled according to the Manual and at least one real world pilot.
Pertinent comments welcome (Flames expected but not welcome)