What chopski said makes sense - perhaps it is the same for most smaller heli's,
Just quickly back to what "Disguise Delimit" said about the Movies is so true,
The best exapmle I ever saw was on the film GOLDENEYE - James bond - This black R22 comes out of a train and noise is some huge jet engine? And then when it lifts off - its a piston engine again...!
Plus I never saw the pilot check the essentials! LoL!
RHM