Re: Problems of Scale with Scale Models

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Re: Problems of Scale with Scale Models mirentwo 03-10-2008
Posted by dave sanderson on March 11, 2008, 4:12 am
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> HI!I am doing my proyect and is about wind turbines. I have to desing an
> aerodynamic wind turbine. Is NACA 4418. I would like to know if you Know
> wich is the best angle of atacc for those type of airfoils, ecause I
> have been searching information and i cant found it.
> thank you
>
> --
> mirentwo
> ------------------------------------------------------------------------
> mirentwo's Profile:http://www.rcgroups.com/forums/member.php?u=3D200627
> View this thread:http://www.rcgroups.com/forums/showthread.php?t=3D716911

I find a good angle of attack is about 90 degrees to the computer,
then using the keyboard
(at 15 degrees or so) type NACA 4418 angle of attack into your
favourite search engine.
Alternatively you could saunter at about 75 degrees through the door
of the library.
What does this have to do with making small steam engines run at a
leisurely pace?

Dave

Posted by Allan Waterfall on March 11, 2008, 5:52 am
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mirentwo Wrote:
> HI!I am doing my proyect and is about wind turbines. I have
to desing an
> aerodynamic wind turbine. Is NACA 4418. I would like to know if
you Know
> wich is the best angle of atacc for those type of airfoils, ecause I
> have been searching information and i cant found it.
> thank you

Aren't all the wind turbine blades made somewhat like a propeller where
the
pitch changes from root to tip,or are they just a tapered airfoil
and the angle
of attack is varied according to the wind speed ?

At a guess,the thickness and airfoil alters from root to tip without
the twist
of a propeller.

Allan


--
Allan Waterfall
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Allan
Waterfall's Profile: http://www.rcgroups.com/forums/member.php?u=52672
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thread: http://www.rcgroups.com/forums/showthread.php?t=716911


Posted by Dragon on March 11, 2008, 8:48 am
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>
> HI!I am doing my proyect and is about wind turbines.

Come on guys we can do better that just be critical.
The suggestion of getting a good text on aerodynamics is not helpful as this
is a particular application so general aerodynamics information won't help
much especially when you are new to it all.
Wind generator blades are twisted like a propeller for the same reason of
getting sensible angles of the blade section to the approaching wind when
the rotor is turning.
Typing 'wind turbine design' into Google will give the OP a lot of
information.
Much of it is of a practical nature.

Henry



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