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johnwill
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 Posted: Jan 11, 2011 - 06:38 PM
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Elite 1K
Joined: Mar 24, 2007 - 09:06 PM
Posts: 1364
Location: Fort Worth, Texas
Status: Offline
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ilter79,
I don't remember seeing any store location reference, but I suppose it could be true. Due to spanwise flow and fuselage interference effects, there are differences in flow at different wing stations.
Remembering that drag index is supposed to be used only to assist in estimating cruise drag effects, profile drag is the dominant type of drag in cruise condition. So I suppose I'd have to agree with the statement. As I recall, somewhere there are tables to estimate cruise fuel burn as related to total (airplane plus stores), perhaps at different altitudes. As I said earlier, the drags are for 0.8 mach number.
Roscoe,
I can see that roll moment coefficients are related to span more than to MAC, not so clear about yaw moment. However, any reference length would suffice for any coefficient. As would any reference area. For example, drag coefficients are much more physically related to cross section area rather than wing area, but wing area works just fine. It is what it is. |
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Sponsor
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 Posted: May 24, 2013 - 11:18 PM
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