Helicopter Rotors

Dont know if this is in the correct place so please move if its wrong 
Basically i have a helicopter in fs9 that visually doesn't show the helicopters rotors moving fast enough, no matter how much throttle i use. Other helicopters do show them moving as i imagine they would i.e kind of blurred as i add throttle.
Therefore if i take a screenshot its like the engines are stopped. Or like im using a slow shutter speed!
Can i change out the textures with the rotors from another helicopter that does have this effect to fix this or is this something that cannot be changed?
Or is there somthing in the .cfg i could alter to increase the rotor speed?
Looking at the textures, they look similar in both helicopters...
Sorry, i dont know much about modelling helicopters but i presume it works on the same principles as the props on fixed wing aircraft.

Basically i have a helicopter in fs9 that visually doesn't show the helicopters rotors moving fast enough, no matter how much throttle i use. Other helicopters do show them moving as i imagine they would i.e kind of blurred as i add throttle.
Therefore if i take a screenshot its like the engines are stopped. Or like im using a slow shutter speed!
Can i change out the textures with the rotors from another helicopter that does have this effect to fix this or is this something that cannot be changed?
Or is there somthing in the .cfg i could alter to increase the rotor speed?
Looking at the textures, they look similar in both helicopters...
Sorry, i dont know much about modelling helicopters but i presume it works on the same principles as the props on fixed wing aircraft.