Bell 47
Chinese Fella.
Just a quick reply on your point of getting slow on the RPM's. I'm an instructor on the B47. If in the decent the RPM's does get a tad on the low side, if you turn both left and right on the decent, watch the RPM build then. If you have to perform a turn on the way down, go to the left, and watch the RPM build. Also with a big flare at the bottom, that helps too...
Also, in the hover you can let the RPM's decay and the D1 model will hold a hover, just, at 250 RPM's
If you do get the chance to practice this you maybe amazed. Hope this has enlightend some..
Regards,
Darren