If you ever wanted to know what a Bell 47 Helicopter gear box looks
like take a look at this.

http://cgi.ebay.com/ebaymotors/BELL-47-M-R-transmission-helicopter-part-/320585434705

The price is a bit steep so this is probably as close as I will ever get to one.

Erik

Here are some pictures I took when adapted to a rotary.

Paul Lamar