"How about wading into the shallow part and providing some basic answers? How will you shed the weight? This is the Tech forum, not the brochure-speak dream forum."
"No you didn't. You extrapolated wildly from a graph to guesstimate a desired outcome."
"The graph represents aircraft, not engines. I asked about airframe weight, not BPR."
"How did you derive such a claim?"
"I mentioned no such thing. Short haul aircraft are structurally reinforced to handle their high cycle operating environment. This adds weight."
"The MIT study you linked to contradicts your statement:
Time to reconsider what conclusions are possible! "
"Keesje, there are many highly experienced and knowledgeable aviation professionals willing to contribute meaningfully to your idea if you are willing to engage in a honest dialogue. "
Machaca, excuse if I angered you, if I appeared dishonest> I did not intend to avoid basic answers!
As I mentioned in earlier posts (#6) I did not take the B737 or A320 as a starting point. I took the BAE146 family (fuselage) and TP400 engine (MTOW) as starting points. As you can see in the first post the Turboliner shares the tail, landing gear and general wing configuration. If we look at the last biggest ever BAE146 variant, the RXJ100, it has an empty weight of about 25.450kg (56,108lb). The max 120 seat Fokker 100 is a tonne lighter.
This photo no doubt creates sad feeling for UK readers.. sorry, the only RJX100. Specs: http://www.!!!!!!!!!!!!!!/aircraft-data/stats.main?id=48
The RJX has a 1500 kg lower OEW then the Turboliner. The RJX basic airframe & wing were developed about 35 years ago.
Taking the RXJ1000 & TP400 as a starting point (as I did:
http://i191.photobucket.com/albums/z...g?t=1214997582 ).
- Replacing the 4 engined BAE 146 wing with a new CRFP wing with 2 engines will save weight. : 1500 kg?
- Replacing the the RXJ's Al tail with a CRFP one will save weight 1000 kg?
- Replacing floor and floor beams and torsionbox with CRFP : 1000 kg?
- The Turboliner has less range, max speed, lower ceiling : xxx kg?
That leaves ~5000kg for the 6 meters fuselage stretch (2 plugs) and seats / cabin and other adjustments that come with it. Not an unreasonable estimation I think.
Maybe I'm optimistic and the OEW is higher. An OEW close to the A320 as you suggest would be to high IMO. I don't think its like comparing a SUV to a compact car, but the designs have different missions for sure.
kind regards,
keesje