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convexengineering / SPaircraft

Models for commercial aircraft design
http://spaircraft.readthedocs.org
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M 0.72 cruise 737 overly sensitive to min tail volume #74

Closed mayork closed 7 years ago

mayork commented 7 years ago

@1ozturkbe this really worries me. The difference between a min VT volume of .1 and .03 is gigantic. I can't explain it.

1ozturkbe commented 7 years ago

I see it... I can't justify setting a min tail volume of 0.1 when 0.042 seems to be optimal though. Don't really know the way forward with this.

mayork commented 7 years ago

I figured it out...had to do with fuselage drag mdoel. we really need a bigger one.

1ozturkbe commented 7 years ago

bigger tail? Why is it so?

mayork commented 7 years ago

I just ran a TASOPT 737 and set the fuselage lift percent and drag coefficient ti what thatvoutput and generated this plot. I put tail volume to .05, the optimal for the Mach 0.8 case

1ozturkbe commented 7 years ago

I am really confused about this issue. What is the status on this @mayork? Can we close?

mayork commented 7 years ago

yeah i think so