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victorbravo(at)sbcglobal.
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 Posted: Sat Jan 26, 2008 1:49 pm Post subject: Cabin airfoil |
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Now if that ain't Al Sharpton calling Jesse Jackson black...
MacDonald Doug wrote:
| Quote: | that the Savannah boys in Alberta have commented that
the Land Africa is a rip off of the Savannah.
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bryanmmartin
Joined: 10 Jan 2006
Posts: 1018
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| Posted: Sat Jan 26, 2008 4:00 pm Post subject: Cabin airfoil |
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The airfoil segment over the top of the fuselage can't really be
considered part of the wing, it is part of the fuselage so the entire
fuselage must be considered as the airfoil section at that point. You
have, in effect, a very low aspect ratio airfoil at that point and low
AR wings tend to have very low L/D ratios. Basically, you may gain
some lift by continuing the airfoil shape over the fuselage but you
will probably get more extra drag than lift. This will be made worse
because you will also be adding more surface area exposed to the
airstream and therefore more parasite drag.
Then there is the extra weight to consider. You can minimize this by
building the segment from aluminum, you might actually be able to
reduce weight this way because you won't need the relatively heavy
plexiglas for the top of the cabin. You will lose a lot of visibility
upward and into a turn though.
If you want to retain the visibility though the top of the cabin, you
will have to build out of plexiglas. This will require more plexiglas
that would otherwise be needed and would add more weight. You would
gain several inches of headroom, but do you really need that?
On the high-wing Cessnas, they didn't continue the airfoil curve
across the top of the fuselage to get more lift. On the Cessnas, the
wing is mounted lower on the fuselage such that the top of the wing is
even with the top of the cabin, so the shape was continued over the
fuselage for ease of construction. If you've ever flown a high wing
cessna, you will remember the wings block out a lot of sky to the
sides and top of the cabin. You always have to lift the inside wing to
check for traffic before banking into a turn.
Overall, the only reason I can see for continuing the wing airfoil
over the fuselage on the 701 is strictly for looks.
--
Bryan Martin
N61BM, CH 601 XL,
RAM Subaru, Stratus redrive.
do not archive.
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_________________
--
Bryan Martin
N61BM, CH 601 XL, Stratus Subaru.
do not archive. |
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don_lewis(at)swbell.net
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| Posted: Sat Jan 26, 2008 6:28 pm Post subject: Cabin airfoil |
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[quote] ---
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paulrod36(at)msn.com
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| Posted: Sun Jan 27, 2008 12:17 pm Post subject: Cabin airfoil |
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<?xml:namespace prefix="v" /><?xml:namespace prefix="o" /><![endif]--> uh uh. Lift is provided by Washington, Franklin, Jackson, Grant, et al. Everything else is merely the means by which they are applied.
Paul Rodriguez
DO NOT ARCHIVE.
[quote] ---
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