I am Fred from www.hovercontrol.com, I am the coder behind Helicopter Total Realism (HTR) an FSX physics add on for helicopters tested and used by several real pilots.
I am releasing modified flight dynamics files based on HTR parameter calculations and adapted to Rotorlib.
Here's my first release for the "light" helicopter based on the FSX MD Helicopter. I mostly worked on the moments of inertia and rotor reaction, I also tried to change the velocity envelope parameters, those are currently commented in the XML files, but you can check those too by uncommenting by DragDueToAoA part and commenting the default one...
just unzip to your TKOH root directory, it will update/add files under your Hsim folder (maybe back it up before unzipping my files)
I plan to add medium and heavy in the next few weeks.
Here's the link to the medium profile, see page 2 of this post for detailed info
if you downladed this before february 3rd, redownload the updated version, the old version is still there as an "old" file
Unfortunately there's no way to change some beaviours like translational lift, vortex ring state, translating tendency, retreating blade stall, blowback, tail rotor stall etc... but I believe the "pleasure to fly" and realism is really improved...
Let me know what you think