To say it with other words, you made the blade flat and rotated along its
main axis,
while it should be twisted like an helix. When it rotates, the two front
edge should
catch the air to put it to the back of the plane.

-Fred

----- Original Message -----
From: "Jim Wilson" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Thursday, April 18, 2002 2:07 PM
Subject: re: [Flightgear-devel] Propellor graphics


> David Megginson <[EMAIL PROTECTED]> said:
>
> >  > The two blades are not twisted relative to each other: one blade is
> >  > pushing and the other pulling.
> >
> > Yes, that needs to be fixed, but I'm still trying to understand it
> > (even my own preflight inspections of a real C172 prop aren't helping
> > me yet).
> >
> If you look down at the propeller in the model from above (with the nose
> appearing pointed up on the screen), the blade on the right is fine.  The
top
> edge is trailing.  The blade on the left's top edge should be leading, but
as
> it is now it is also trailing.
>
> Another way to describe it is if you look directly along an axis that goes
> longitudinally along the prop blades from the starboard (left) side of the
> aircraft model,  you should see this:
>
> \   /
>  \ /
> <=\==
>  / \
> /   \
>
> (i.e. the two blade's profiles make an X).  Note that it is the *left*
blade
> that needs to be fixed, if you are rotating apparently clockwise (when
sitting
> in the pilot's seat) as I believe you are.
>
> Best,
>
> Jim
>
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> Flightgear-devel mailing list
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>


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