msfs-2024 #honeycomb-sierra-tpm steam
I just switched from the Velocity One Flight to the Honeycomb Alpha+Sierra TPM. In msfs-2024 on PC (Steam) I have the problem, that the trim doesn’t work good. When turning the trim wheel the trim in the simulator hardly moves/changes.
The Sierra TPM trim problem was addressed as I side note in this solved thread: Honeycomb Sierra TPM - User Support Hub / Hardware & Peripherals - Microsoft Flight Simulator Forums. But there was only a solution for the initial issue and not for the trim issue. I opend this thread to present you my solution, if you also have this problem. I also want to present my findings about the different trim wheel hardware solutions as there was some discussions about them in the above mentioned thread. This represents only my experience. I have no detailed technical information about the hardware.
The trim wheel on the V1F actually feels better to the touch, as it is also larger than that of the T.Sierra TPM. However, with the solved trimm issue, I find the trim control in MSFS2024 better with the Sierra TPM. After some research, I found that the controller manufacturers implement two variants for trim:
1. Analog axis
2. Repeated button press
The V1F uses an analog axis. The advantage is that you can adjust the sensitivity in the simulator. The problem with this solution is that the axis “stores” an absolute position value of the trimming (e.g. 8°). The flight simulator also stores the current absolute position of the trim (e.g. 0°). If the simulator and hardware are not in sync, sometimes when you move the trim wheel for the first time, the trim in the simulator “jumps” because it jumps from its current absolute value to the hardware value. I think this problem is often mentioned (e.g. also jumping to 99%)
On the other side the Honeycomb Sierra TPM sends a repeated button press (trim up/trim down), when you turn the trim wheel. So this version only sends a relative difference value for the trimming (e.g. +0.1° or -0.1°). With this there is no “jumping” of the trim wheel. This is why I like this solution better.
Both versions feel the same in terms of tactile experience: a continuously rotating wheel. However, the hardware sends different signals to the simulator.
Now, comming back to the issue with the Sierra TPM and MSFS2024. It seams that Asobo Studio fixed an issue (10° bug), where the trim steps (I think for trim buttons not trim wheel) where to big. This fix seems to lead to the issue that for trim wheels using button steps instead of axis the steps are to small.
To fix this issue you can use tools to override the step size for the buttons, e.g. FSUIPC7 or SimTrim.
I use SimTrim, as it comes with no cost (or at least only a coffee for the developer 
). I set digital input 1 to -0.00174532925 degrees in radians and input 2 to 0.00174532925. This represents ±0.1°. With this settings the trim wheel behaves as expected for me and similar to how it felt with the V1F. Until now I didn’t have any trim jumps with the Sierra TPM.
Hopefully Asobo will fix the issue or introduce a setting, where you can define the step size.