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Vscf On 737 MAX?  
User currently online1337Delta764 From United States of America, joined Oct 2005, 6423 posts, RR: 2
Posted (2 years 5 months 4 weeks 1 day 15 hours ago) and read 2755 times:

Through the 737's history, Boeing used an IDG on the original 737, then went to a VSCF in the 737 Classic, but then went back to an IDG on the 737NG due to reliability problems with the VSCF at the time.

However, with recent advancements in VSCF technlogy (as it is used on the A380, 787, and will be used on the A350), is it possible that Boeing could return to a VSCF with the 737 MAX? A VSCF could offer some weight savings, which is why Boeing is using it on the 787 and Airbus on the A380 and A350.


The Pink Delta 767-400ER - The most beautiful aircraft in the sky
4 replies: All unread, jump to last
 
User currently onlineyeelep From United States of America, joined Apr 2011, 646 posts, RR: 0
Reply 1, posted (2 years 5 months 4 weeks 1 day 13 hours ago) and read 2742 times:

All the Classic's I work on use a CSD.

User currently offlineDalmd88 From United States of America, joined Jul 2000, 2532 posts, RR: 14
Reply 2, posted (2 years 5 months 4 weeks 1 day 2 hours ago) and read 2677 times:

Every classic I worked on had a CSD also. The MD90 is the only older VSCF plane I'm aware of.

User currently online1337Delta764 From United States of America, joined Oct 2005, 6423 posts, RR: 2
Reply 3, posted (2 years 5 months 4 weeks 22 hours ago) and read 2617 times:

Okay, I guess I must be mistaken then. I read somewhere that the 737 Classic used a VSCF; that source must have been wrong.

Still, this doesn't prevent us from asking the question whether or not the 737 MAX will use a VSCF for weight savings.



The Pink Delta 767-400ER - The most beautiful aircraft in the sky
User currently offlinetdscanuck From Canada, joined Jan 2006, 12709 posts, RR: 80
Reply 4, posted (2 years 5 months 4 weeks 19 hours ago) and read 2566 times:

Quoting 1337Delta764 (Thread starter):
However, with recent advancements in VSCF technlogy (as it is used on the A380, 787, and will be used on the A350),

The 787 (and I'm pretty sure the A380) doesn't use VSCF, it uses VSVF...the frequency is variable too.

Quoting 1337Delta764 (Thread starter):
is it possible that Boeing could return to a VSCF with the 737 MAX?

It's possible...it's an all new engine anyway so it's a descent opportunity to change the generators but the 737NG's IDG's have pretty impressive reliability now and, since they're not changing the fuselage/systems much, they probably don't need more power. It seems like risk for not a huge amount of gain.

Quoting 1337Delta764 (Reply 3):
Okay, I guess I must be mistaken then. I read somewhere that the 737 Classic used a VSCF; that source must have been wrong.

You weren't mistaken, they were an option. Not a very popular one. Here's pictures of all the different kinds:
http://www.b737.org.uk/generators.htm

Tom.


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