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Diff P&W's On Classic 747  
User currently offlineRmm From Australia, joined Feb 2001, 524 posts, RR: 1
Posted (12 years 10 months 1 week 15 hours ago) and read 2112 times:

Does anyone know why Boeing/Pratt changed the engine cowling
on some early 747's then changed it back to the old style on the
747-300?

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Photo © David Morrell



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Photo © Philippe noret



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Photo © Brian Wilkes



Thanks
Rmm


6 replies: All unread, jump to last
 
User currently offlineCharliecossie From Germany, joined Oct 2001, 479 posts, RR: 9
Reply 1, posted (12 years 10 months 1 week 14 hours ago) and read 2077 times:

What makes you think the Madagascar a/c has JT9's?


User currently offlineRmm From Australia, joined Feb 2001, 524 posts, RR: 1
Reply 2, posted (12 years 10 months 1 week 13 hours ago) and read 2074 times:

A few things,

a) P&W logo on #2 engine.
b) The only other similiar looking engine for that model was the CF6-50.
It doesn't have the pointed tail cone like the -50. Have a look at some
KLM 742's and you'll see what I mean.
c) Commercial Jet Aircraft Census - http://www.bird.ch/bharms/asr_sh00.htm
lists the original build config of this particular Air Madagascar A/C with
JT9-70A

Rmm


User currently offlineYyz717 From Canada, joined Sep 2001, 16248 posts, RR: 56
Reply 3, posted (12 years 10 months 1 week 11 hours ago) and read 2066 times:

PW offered the JT9D-70A engine from the mid-70's...with the GE-like nacelle.....as pictured on the Air Madagascar aircraft above. It was only ordered by Air Mad, SAS, Seaboard World. The new nacelle design was found to be heavy & not efficient, so updated PW engines for the 742 such as the 7Q engine reverted to the original nacelle design/shape.

Neil/Toronto




Panam, TWA, Ansett, Eastern.......AC next? Might be good for Canada.
User currently offlineCharliecossie From Germany, joined Oct 2001, 479 posts, RR: 9
Reply 4, posted (12 years 10 months 1 week 10 hours ago) and read 2059 times:

Apologies.
Now that I've actually looked at the picture I can see
that it's the -70.


User currently offlineTimz From United States of America, joined Sep 1999, 6813 posts, RR: 7
Reply 5, posted (12 years 10 months 6 days 21 hours ago) and read 2038 times:

I read somewhere that P&W was trying for commonality with the DC-10 (and the A300, they hoped). Think it said the JT9D-70 (or 7O?) was about the same as the -7Q aside from the nacelle.

User currently offlineYyz717 From Canada, joined Sep 2001, 16248 posts, RR: 56
Reply 6, posted (12 years 10 months 6 days 21 hours ago) and read 2030 times:

Ya, what you say rings a bell Timz.

I do recall reading that the rather bulbous size of the -70 engine added drag & weight.



Panam, TWA, Ansett, Eastern.......AC next? Might be good for Canada.
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