On 7/3/07, Gordan Sikic <[EMAIL PROTECTED]> wrote:
John Denker wrote:
Hi John,
> In every aeronautical engineering publication I've seen, the
> convention for "positive" has been:
> -- Positive aileron deflection creates a positive rolling moment,
> positive around the +X axis, i.e. roll to the right;
> -- Positive rudder deflection creates a positive yawing moment,
> positive around the +Z axis, i.e. yaw to the right; and
> -- Positive elevator deflection creates a positive pitching moment,
> positive around the +Y axis, i.e. nose up.
>
Could you pls share the names of publications you use to backup your
statements?
In every aeronautical engineering publication I've seen, convention was
exactly opposite of "your" definition. For example, in the book
"Aircraft control and simulation", by Brian Stevens and Frank Lewis, on
page 128, there is a table (TABLE 3.3.1), where is clearly stated that
positive movements of all primary control surfaces produce negative
moments.
best regards,
Gordan
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As a note, I vaguely remember my professor saying something about there
being an American sign convention and an English sign convention... or
something like that... and that they differ when it comes to the aileron
deflection and rolling moment... and that Roskam uses the English system...
Anyway my memory is hazy and quick google resolved nothing. Can anyone else
elaborate?
Thanks.
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