Re: PW 8000 engines for 737/320

Date:         28 Mar 98 14:21:43 
From:         domk1031@cetus.zrz.TU-Berlin.DE (Burkhard Domke)
Organization: Technical University of Berlin, Germany
References:   1 2 3
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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.
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?

Burkhard