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1337Delta764
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Vscf On 737 MAX?

Sat Jan 14, 2012 2:40 am

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.
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yeelep
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Joined: Mon Apr 04, 2011 7:53 pm

RE: Vscf On 737 MAX?

Sat Jan 14, 2012 4:42 am

All the Classic's I work on use a CSD.
 
Dalmd88
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RE: Vscf On 737 MAX?

Sat Jan 14, 2012 3:34 pm

Every classic I worked on had a CSD also. The MD90 is the only older VSCF plane I'm aware of.
 
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1337Delta764
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RE: Vscf On 737 MAX?

Sat Jan 14, 2012 7:37 pm

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.
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tdscanuck
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RE: Vscf On 737 MAX?

Sat Jan 14, 2012 10:42 pm

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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