Genrege
Yes the prop is different, the 180R is a glider tug and it has a prop that is optimized for climbing at about 70 KTS as this is the best lift/ drag speed for the airframe and so the best speed for towing gliders into the air, Unfortunatly the propeller severely limits the engines ability to produce power at altitude or higher TAS due to the RPM limit on the engine. ( but it is a very good glider tug !)
With the cruise prop fitted things are totally different with the engine making 75% power at 8000 ft at 2700 RPM on a ISA day.
If you intend to use the aircraft for touring then it is another prop that you require, if you are thinking of doing this then take a look at all the options as Sensenich, MT & Hoffman have props approved for the DR400-180.
Last edited by A and C; 14th Sep 2012 at 14:12.