apparently the Trex 450 in the FS One expansion pack is very realistic if you make the following adjustments from thread 1328 in the big FS One thread:

"Scott,

You did it. Thanks man. The T-Rex is about dead on to the real thing now.

Here's my mods mixed with yours.

• Under Aerodynamics I made the changes to Rotation Damping: Roll: 0.100, Pitch: 0.100, Yaw: 0.100
• Under Main Roter I made changes to Blade Rotational Inertia to 0.0028
• Mass: empty weight 1.8
• Aerodynamics: aerodynamics reference area .2
• Tail Rotor: Solidity: .25
• Tail Rotor: Overshoot time constant: .002


Kraig"

Scott is SctHolson who can do nowrong in FS One. Here's the link

http://www.rcuniverse.com/forum/m_42...54/key_/tm.htm

My work here is done.
cheers,
Dave