finding MAC

[Skipper Jones]

This message from "Skipper Jones" <skipperj@cableone.net> brought to you by EFLIGHT!

Hi Guys,

Problem: I am designing an E plane and want to use an elliptical wing planform. I am familiar with MAC for parrell wings, tapered wings, even biplanes with stagger, but, have never encountered a method for elliptical wings.

Can anyonr here point me in the right direction?

TIA
Skipper Jones SkipperJ@cableone.net

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[John B Swetland]

This message from "John B Swetland" <jbswetland@earthlink.net> brought to you by EFLIGHT!

Skipper,
Look at this site. http://www.math.hmc.edu/funfacts/ffiles/10006.3.shtml

John S.

Hi Guys,

Problem: I am designing an E plane and want to use an elliptical wing
planform. I am familiar with MAC for parrell wings, tapered wings, even
biplanes with stagger, but, have never encountered a method for elliptical
wings.

Can anyonr here point me in the right direction?

TIA
Skipper Jones SkipperJ@cableone.net


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[Bill Conkling]

This message from "Bill Conkling" <conk@widomaker.com> brought to you by EFLIGHT!

My CAD program has some analysis (sp) feartures including the
centroid, which I think is a point equidistant from all edges and
vertices. The sentroid lies on the MAC.

......bc
----- Original Message -----
From: "Skipper Jones" <skipperj@cableone.net>
To: <eflight@ezonemag.com>
Cc: "Skipper Jones" <skipperj@cableone.net>
Sent: Monday, May 19, 2003 8:35 PM
Subject: [EFLT] finding MAC


This message from "Skipper Jones" <skipperj@cableone.net> brought to
you by EFLIGHT!

Hi Guys,

Problem: I am designing an E plane and want to use an elliptical wing
planform. I am familiar with MAC for parrell wings, tapered wings,
even biplanes with stagger, but, have never encountered a method for
elliptical wings.

Can anyonr here point me in the right direction?

TIA
Skipper Jones SkipperJ@cableone.net

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[Neil Stainton]

This message from "Neil Stainton" <neil@itpartnership.com> brought to you by EFLIGHT!

This might work: Draw a line from the centre of the root (ie 50% chord)
to the tip on one wing. Then use the CAD program to find the centroid of
the 1/4 ellipse from the LE to this mid chord line.

Neil Stainton
Leamington Spa, UK.


> -----Original Message-----
> From: owner-eflight@ezonemag.com
> [mailto:owner-eflight@ezonemag.com] On Behalf Of Skipper Jones
> Sent: 20 May 2003 01:36
> To: eflight@ezonemag.com
> Cc: Skipper Jones
> Subject: [EFLT] finding MAC
>
>
> This message from "Skipper Jones" <skipperj@cableone.net>
> brought to you by EFLIGHT!
>
> Hi Guys,
>
> Problem: I am designing an E plane and want to use an
> elliptical wing planform. I am familiar with MAC for parrell
> wings, tapered wings, even biplanes with stagger, but, have
> never encountered a method for elliptical wings.
>
> Can anyonr here point me in the right direction?
>
> TIA
> Skipper Jones SkipperJ@cableone.net

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[John B Swetland]

This message from "John B Swetland" <jbswetland@earthlink.net> brought to you by EFLIGHT!

Skipper,
Here is ready made calculator.
http://www.csgnetwork.com/areaellipse.html

Hi Guys,

Problem: I am designing an E plane and want to use an elliptical wing
planform. I am familiar with MAC for parrell wings, tapered wings, even
biplanes with stagger, but, have never encountered a method for elliptical
wings.

Can anyonr here point me in the right direction?

TIA
Skipper Jones SkipperJ@cableone.net


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[Rick Page]

This message from Rick Page <rick-page@shaw.ca> brought to you by EFLIGHT!

>I am designing an E plane and want to use an elliptical wing planform.
The MAC of an elliptical wing is at 40% of the span.

Rick.

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[John B Swetland]

This message from "John B Swetland" <jbswetland@earthlink.net> brought to you by EFLIGHT!

> >I am designing an E plane and want to use an elliptical wing planform.
> The MAC of an elliptical wing is at 40% of the span.
>
> Rick.

Rick,
Wouldn't that be 40% of the half span measured from the tip?

John S.

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[Rick Page]

This message from Rick Page <rick-page@shaw.ca> brought to you by EFLIGHT!

>Wouldn't that be 40% of the half span measured from the tip?
The MAC is the point where half the area is at the tip and half at the root
(of a regular shape). So 40% from the root of an elliptical wing is halfway.
Its 33% for a delta (triangle).
For very complicated planforms, like bird wings, divide the wing into as
many trapezoids as you want and calculate a weighted average.
http://www.djaerotech.com/dj_askjd/dj_questions/canard1.html
http://members.cox.net/twitt.02/HoeyCalcs.html

Or use a computer.
http://ciurpita.tripod.com/rc/wing/air_db/wing.html
http://perso.wanadoo.fr/scherrer/matthieu/english/mce.html

Rick.


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[John B Swetland]

This message from "John B Swetland" <jbswetland@earthlink.net> brought to you by EFLIGHT!

> The MAC is the point where half the area is at the tip and half at the
root
> (of a regular shape). So 40% from the root of an elliptical wing is
halfway.
> Its 33% for a delta (triangle).
> For very complicated planforms, like bird wings, divide the wing into as
> many trapezoids as you want and calculate a weighted average.
> http://www.djaerotech.com/dj_askjd/dj_questions/canard1.html
> http://members.cox.net/twitt.02/HoeyCalcs.html
>
> Or use a computer.
> http://ciurpita.tripod.com/rc/wing/air_db/wing.html
> http://perso.wanadoo.fr/scherrer/matthieu/english/mce.html
>
> Rick.

Thanks Rick,
Some day I might remember that MAC is not average chord[:-)

John S.


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[Skipper Jones]

This message from "Skipper Jones" <skipperj@cableone.net> brought to you by EFLIGHT!

Thanks John.
Looks good to me. Did an experimental method I'd fashioned (or remembered).
Too long for now. Must prerpare for minor surgery tomorrow some 80 miles
away. I'll report in more detail later.
Thanks again
Skipper
----- Original Message -----
From: "John B Swetland" <jbswetland@earthlink.net>
To: <eflight@ezonemag.com>
Sent: Tuesday, May 20, 2003 5:08 PM
Subject: Re: [EFLT] finding MAC


> This message from "John B Swetland" <jbswetland@earthlink.net> brought to
you by EFLIGHT!
>
> > The MAC is the point where half the area is at the tip and half at the
> root
> > (of a regular shape). So 40% from the root of an elliptical wing is
> halfway.
> > Its 33% for a delta (triangle).
> > For very complicated planforms, like bird wings, divide the wing into
as
> > many trapezoids as you want and calculate a weighted average.
> > http://www.djaerotech.com/dj_askjd/dj_questions/canard1.html
> > http://members.cox.net/twitt.02/HoeyCalcs.html
> >
> > Or use a computer.
> > http://ciurpita.tripod.com/rc/wing/air_db/wing.html
> > http://perso.wanadoo.fr/scherrer/matthieu/english/mce.html
> >
> > Rick.
>
> Thanks Rick,
> Some day I might remember that MAC is not average chord[:-)
>
> John S.
>
>
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