posted on Jul, 13 2007 @ 09:10 AM
Actually RichardPrice I have been finding a variety of different OEW and MTOW figures. But from what I can see the Operational Empty Weight of the
"J" model is nearly the same or about 800/1000lbs less than the "H" model, take your pick (between 75,500 for the J to around 76,800 for the H).
Pretty much the same seems to be the case for the MTOW as well. It is interesting and somewhat surprising that this is the case particularly given
that lighter materials were used in the construction of the J and the underwing fuel tanks ommitted. I was unable to get takeoff distances for both
versions but I will take your word for it that they are the same. Again this is very surprising given the quite significant increase in the engine
power of the J from earlier models. About the only thing that has improved is speed, and as a result climb rates.
I would like to point out that it is not just the FADEC of the AE-2100 that makes it a better powerplant but also improved internal engine design, ie:
a more efficient compressor section, higher temp hot section, more robust fan and improved materials and manufacturing techniques. Not to mention the
far more efficient 6 bladed prop design which really stretched the limits of turboprop technology given its size and the number of props on each
And finally to answer a question from emile about the lack of difference in MTOW between the standard length and -20/-30 fuselage models. Its quite
simple emile, the earlier models had plent of power to lift their loads but what often happened was that they "cubed out", that is they ran out of
internal volume before they reached their max weight. Often the aircraft could carry 2 or 3 more pallets worth in weight but they did not have enough
internal volume left to fit them. As a result of this a "stretch" of the fuselage was decided upon to overcome this problem and make greater use of
the aircrafts maximum takeoff weight. The RAF was I believe one of, if not the first operators of the stretched model.