Date: 30 Mar 98 04:31:06 From: Chuanga@cris.com (H Andrew Chuang) Organization: Concentric Internet Services References: 1 2 3 4
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In article <airliners.1998.511@ohare.Chicago.COM>, Burkhard Domke <firstname.lastname@example.org.TU-Berlin.DE> wrote: >On 24 Mar 98 11:38:33 , Marc Schaeffer ><marcmscREMOVE_TO_REPLY@cmdnet.lu> wrote: > >>Burkhard Domke wrote: >>> AFAIK, the PW8000 won't fit the 737 anyway, as the fan diameter is too >>> large. >> >>As the target for the PW8000 is the 320 and 737 I doubt that they are that >>dumb to exclude 50% of the market from the start. > >Fan diameters: > >CFM56-3B/C 60 in. (B737-3/4/500) >CFM56-7 61 in. (B737-6/7/8/900) > >PW8000 76-79 in. > >So you tell me about ground and bank angle clearance of a conceived >PW8000/B737 combination. And don't forget the enhanced FOD risk >stemming from an airflow of about 1369 lbs/sec for the PW8000, >compared to about half (!) as much for the CFM56. >And since a smaller core is hardly feasible, you can't go far below >those 76 inches in fan diameter while maintaining an 11:1 by-pass >ratio. I believe in one of the articles on the PW8000, a Pratt official did say if the PW8000 is to be put on the B737, Boeing will need to redesign the landing gears to accommodate the larger fan. >Anyway, the B737s would only fit the extreme lower edge of the 25,000 >to 35,000 lbs. thrust spectrum stated for the PW8000. > >The "conventional" 56 inch dia fanned PW6000 (15,000 to 23,000 lbs >SLST) seems to be more suitable for the B737 (except -8/900), doesn't >it? The PW6000 has been proposed for much smaller planes: the AE31X, the Indonesian jet (IPTN 2130?), and the latest entry in the potentially very crowded 100-seat market, the A319M5. The PW6000 may be appropriate for the B737-600 and marginal for the -700, but definitely underpower for the -800 and -900. The majority of the B737 will be in the -700 and -800 segments. Thus, I don't think the PW6000 is a suitable powerplant. Anyway, P&W will have to first demonstrate that the PW8000 can achieve its promised potential on the "next genration" A320, then P&W will be able to force Boeing to abandon its exclusive agreement with CFMI, and develop a fourth-generation B737.