New big prop, facing the A320 & 737: TurboLiner.

[keesje]

Thnx for the responses. I was on a trip this week. In the week-end I will find time for a better look & maybe do a mark IV based on your comments.

• Question 1: I included DLC to improve approach handling. Now it's spoilers + DLC spoilers, which seems overdone. Maybe they could be combined, any suggestions? Could save some weight / complexity.
• Question 2: I included "active cooled power brakes" because thrust reverse works very well for props but makes a lot of noise too. No thrust reverse after landing & electric drive to the gate would really make a difference in total noise pollution. Is there a smart way to use the electric engines as generators during roll out & use the energy to cool the brakes? Or would it be simpler to put on the APU before landing to provide power to a blower/compressor?
• On the low wings+ big props: I took a look & will post some configs I looked at. Think about the recent LH A320 wingtip incident.. http://www.youtube.com/watch?v=z42fchrzhHY Ground clearance would be a design concern.
• On speed : Mach 0.7 is a lot of speed at 25k ft, the Turboliner should be able to do 440 knots like the bulkier A400M (max cruise M.72).
• On prop tip fuselage clearance : I looked at A400M prop-fuselage clearance and added ~20%. Powerplants to far from the cg creates asymetric / 1 engine out issues (bigger tail, weight /drag)
• Counter rotating props are being looked at by the OEMS indeed. They offer advantages (reduced rotor diameter) but also have some issues of there own I think: heavy gearboxes and noise (interference between props) e.g. I guess I sticked on the safe side with an existing engine / prop combination.
• Opposite rotation seems possible (A400M has it too). Less trimming means less drag. It had so in post 1..

rgds