[Sutts]

Type of improvement:
Engine and prop sound improvements

Explanation of proposals:
At the same RPM, an engine under load will sound quite different to an engine under less strain. Listen to the change in pitch of your car engine when starting to climb a hill while maintaining the same RPM. You can hear that the engine is having to work harder. The same is true of aircraft. This effect is obvious when exercising the prop on an aircraft on the ground - as the pitch becomes more coarse, biting more air, the engine has to work harder and the engine note changes. The RPM reduces because the engine can no longer deliver enough power to maintain the new pitch.

At the moment, when coarsening the pitch, it sounds like the throttle is just being pulled back to reduce the RPM. It should sound like the RPM is being forced down due to increased engine load caused by the coarser pitch.

I think to summarise:
1. an engine should sound different under higher loads than when under lower loads, given the same RPM.
2. an engine should sound different at higher power settings (boost) than at a lower power, given the same RPM.

At the moment in CloD I can add +5 of boost while maintaining a constant RPM and the engine sounds exactly the same. The sound only changes when I allow RPM to change.

Also, the sound of the props biting the air should be more obvious. I live close to an airfield and can hear the props being exercised from several miles away. They make a very distinctive beating noise as they are forced to bite into more air. Hard to explain I know but adding such an effect would give a real sense that the prop is biting real air and not just spinning in a vaccum. It does sound rather impressive too when running up on the ground.

Benefits:
More realistic sound experience, greater variety in engine tone and the player gets a greater awareness of the energy state of the engine.