Prop Rumble Effect
Thanks for your answer. So, yes I read it, but it is still very unclear to me. Here are the things that remain unclear (at least for me):
1. "high frequency vibrations will feel stronger at equal intensities. The “High RPM” intensity should be lower than the “Low RPM” intensity". In practical terms, how it is supposed to feel? Does it mean that at higher RPMs we are still supposed to "feel" more rumble than at lower RPMs? Or that we shall reduce the intensity of the High RPMs in such a way that it will make High RPMs feel with less rumble than low RPMs?
2. Regarding the shaking of the entire plane just after starting the propeller and engine, is the behavior driven by this parameters or not. I am not sure i understand the statement "these are not floor values."
4 Replies
The effect is driven purely by the RPM telemetry value. The frequency of the periodic effect will match the RPM value at any given time.
The intensity of the effect is decreased as RPM increases. A 10 Hz (600 rpm) effect at %100 strength would wobble the stick. A 50Hz effect at %100 strength would feel like those old "shocker" arcade games where you had to hold on to handles that would vibrate intensely (feeling like a "shock") for as long as possible to win a prize. Reducing the intensity as the RPM increases provides a more constant tactile feel as the RPM increases.
The RPM ranges and intensity settings are passed through a scaler function. So, as the RPMs increase through the range, the intensity will decrease through the range (or vice versa).
The "floor" statement means that because of the way the scaler function works, if the RPM decreases below the "low RPM" value, the intensity will increase above the "low rpm intensity" value. Same at the high RPM range.
Heres a diagram that shows how it can go above or below the intensity settings
Many thanks, this is MUCH clearer this way, regarding how it is configured and what is the actual purpose of implementing it a scaler. So, in other words the intensity values defined in TelemFFB do not correspond to the min and max rumble felt, it just defining the gradient of this line. If it is so, which values you recommend to use from the aircraft specs when setting up these parameters for a specific plane to be as realistic as possible. Should it be using its min RPMs at idle and its max possible RPMs in flight? Also, I understand from your explanation that the shaking of the entire plane just after starting the engine, would also be covered by the same parameters if it covers the full spectrum, correct? It is not a separate effect that IL2 would reflect. Many thanks again, I believe you have done an incredible work with TelemFFB, setting a real standard, and I am still on the journey of understanding it better, to make the best of it.
Yeah, generally you would set the rpm value and intensity at the two normal extremes (idle and cruise or redline). This should give you a nice rumble during startup too.
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