If you park an R44 and a 206 next to each other you will quickly see there is very little height difference. The Robinson appears to have a longer mast because it does not have a turbine engine and its associated cowlings mounted atop the fuselage.
If you compare the distance from the fuselage where the payloads go to the rotor you will find little difference. It just looks different because the R44 has its engine in the back of the fuselage instead of on top taking up space between the rotor and fuselage.
[This message has been edited by helisphere (edited 23 January 2001).]