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Collecting material for a FAQ - 7/1/2004 9:05:24 PM   
BMatthews



Posts: 8797
Joined: 10/4/2002
From: Burnaby, BC, CANADA
Status: offline 		I'd like to collect links or material for a good Aerodynamics FAQ sticky thread. Particular areas I'd like to get stuff for are....


  • Tail Volume Coefficients and stability calculations for CG placement for various planforms
  • Airfoil drawing and analysis and low Reynolds number information that pertains to our world.
  • Stuff on wing analysis like MAC calculators and lift coefficient tools.
  • Links to sites that host similar material or tools.
  • Anything else that I've missed in this short list....


To start the ball rolling ...

1) Foilsim airfoil applet download...

This is a very handy tool that can be used to determine to a close approximation the lift coefficient of a model and roughly what the stall speed will be and the effect of airfoil camber on the angle of attack and stall speed. It's a wonderfullly simple tool that has many uses when you see how it fits into the various aspects of flight. Highly recomended and great fun to play with. It reallly gives a good feel for how a wing behaves in flight and is a great aid to understanding how to read the lift drag curves that come with airfoils.

2) A page of links to Flying Wing Information

In particular the Panknin wing twist Excel spreadsheet calculator

And if you do not have Excel then here's a link to the free Open Office package that can open much of the Office 2000 material and should work with the Panknin package.... www.openoffice.org .

More when I get time..... Hopefully you folks will offer up enough that I don't need to do more than fill in a few more nooks and cranny's...

BRING'EM ON ! ! !


_____________________________

Bruce-
Proudly wasting balsa since 1965.

Free Flighters go that extra mile........
       Post #: 1

RE: Collecting material for a FAQ - 7/2/2004 1:49:21 AM   
CoosBayLumber


 

Posts: 2857
Joined: 1/20/2002
From: San Bernardino Calif
Status: offline 		Well, what you are proposing has a noble effect, however down the line the column gets littered with chit-chat, people asking "where can I find......" , I agree with.... and someone trying to promote their friend's interest. This has happened in numerous columns at RCU.

I would moreover like to read INFORMATION or sources, than the above noted exceptions. The old brain does not connect idle chit-chat between respondants with original comments. They so often tend to veer the subject matter away. It would be better if the subject matter was heavily moderated, and only applicable things be included or listed.

Also, on occasion, ofr instance once per month, it would be helpfull for the moderator to see that any posted link still works. There are a few dead ones in other forums.


Wm.


_____________________________

www.mybloo.com/coosbay/laser/laser.html
Thousands of Laser Cut parts, thousands

(in reply to BMatthews)
       Post #: 2

RE: Collecting material for a FAQ - 7/2/2004 6:04:06 AM   
BMatthews



Posts: 8797
Joined: 10/4/2002
From: Burnaby, BC, CANADA
Status: offline 		Not to worry Coos, I've learned my lesson with the last one. I'll collect info in this thread and then do up a new one and lock it down to it's only the meat and NO brussel sprouts (I hate brussel sprouts). Credit to the contributors will be given and new additions can be directed to the moderators and included. No idle chit chat to mess it up. Folks will be encouraged to ask questions as they wish in new threads.

So 'fess up with the links man!


_____________________________

Bruce-
Proudly wasting balsa since 1965.

Free Flighters go that extra mile........

(in reply to CoosBayLumber)
       Post #: 3

RE: Collecting material for a FAQ - 7/2/2004 8:57:53 PM   
BMatthews



Posts: 8797
Joined: 10/4/2002
From: Burnaby, BC, CANADA
Status: offline 		Another thought.

How about some of you volunteer to research and assemble or type up some articles for this FAQ? It may be as easy as going back into past threads and bringing the material all together in one place. Or maybe a bit of that plus some Google time. It's just that there's enough topics that I can't do it all myself. Many hands makes for easy tasks.

A partial list of topics...

  • Tail Volume Coefficients for both horizontal and vertical sizeing and relating this to CG placement. We need the equations and links to some sites that may have calculators or other explanations available to go with out own homegrown model related version.
  • A simple newbie level discussion on basic model layout sizing and how different aspects relate to each other
  • A nice newbie article on airfoils. How they work, how the aspects are measured re camber and thickness, basics of lift coefficients and Reynolds numbers.... stuff like that.
  • A more advanced article on airfoils getting into the curves and how to relate them to actual model flying. High lift and anti stall devices would fall under this as well.


I'll add to this once I get some time to go back and see what the more common topics have been over the past year.


_____________________________

Bruce-
Proudly wasting balsa since 1965.

Free Flighters go that extra mile........

(in reply to BMatthews)
       Post #: 4

RE: Collecting material for a FAQ - 7/3/2004 12:42:30 AM   
Baron Johnson


 

Posts: 143
Joined: 12/24/2002
From: Ocala/Gainesville, FL, USA
Status: offline 		Bruce,

Here's a website about tail volume coeffecients called 'How Big The Tail': http://www.eaa62.org/technotes/tail.htm

Baron

(in reply to BMatthews)
       Post #: 5

RE: Collecting material for a FAQ - 7/7/2004 3:36:27 PM   
tommy321



Posts: 41
Joined: 1/1/2004
From: Ottawa, ON, CANADA
Status: offline 		I've mentioned this one on these forums before... it's meant for full scale pilots, but it has one of the best online explanations of lift, and stability that I've ever seen.

How it Flies


Tom

(in reply to Baron Johnson)
       Post #: 6

RE: Collecting material for a FAQ - 7/8/2004 7:20:22 AM   
BMatthews



Posts: 8797
Joined: 10/4/2002
From: Burnaby, BC, CANADA
Status: offline 		Great links so far but we need a lot more than these to fill out a FAQ. I know some of you regulars have a stash of good sites. Come on, pony up!


_____________________________

Bruce-
Proudly wasting balsa since 1965.

Free Flighters go that extra mile........

(in reply to tommy321)
       Post #: 7

RE: Collecting material for a FAQ - 7/8/2004 10:40:36 PM   
KenLitko


 

Posts: 243
Joined: 1/3/2003
From: Crown Point, IN,
Status: offline 		A link to the UIUC airfoil database seems appropriate:

http://www.aae.uiuc.edu/m-selig/ads.html

_____________________________

Ken - http://www.litkoaero.com/
R/C Aircraft Laser Cutting and Design

(in reply to BMatthews)
       Post #: 8

RE: Collecting material for a FAQ - 8/4/2004 2:38:11 AM   
limeybob



Posts: 365
Joined: 5/5/2003
From: Rockwall| Tx, TX, USA
Status: offline 		I have some online calculators at http://pages.sbcglobal.net/limeybob/
Check them out.
Bob

(in reply to BMatthews)
       Post #: 9

RE: Collecting material for a FAQ - 8/11/2004 9:25:34 PM   
adam_one


 

Posts: 398
Joined: 2/26/2003
From: Stockholm, SWEDEN
Status: offline 		You may also find some useful info here:

http://sky.prohosting.com/air2/

(in reply to BMatthews)
       Post #: 10

RE: Collecting material for a FAQ - 9/8/2004 3:23:35 AM   
mulligan



Posts: 1147
Joined: 4/14/2002
From: Sanford, FL, USA
Status: offline 		Here's an academic link on "how it flies"...

http://www.av8n.com/how/

_____________________________

George Mulligan
www.sanfordaeromodelers.com

(in reply to adam_one)
       Post #: 11

RE: Collecting material for a FAQ - 11/15/2004 9:20:30 PM   
ubird1


 

Posts: 30
Joined: 11/8/2004
From: Brunswick, GA, USA
Status: offline 		Andy Lennon (Model Airplane news GURU), developed an Excell spread sheet for RC aircraft design a few years ago. He's about a sharp as you can get concerning RC design.
You might be able to get a copy through MAN along with permission to use it.


_____________________________

Frank Hasty

(in reply to mulligan)
       Post #: 12

RE: Collecting material for a FAQ - 3/4/2005 8:29:11 AM   
BMatthews



Posts: 8797
Joined: 10/4/2002
From: Burnaby, BC, CANADA
Status: offline 		Link to a Neutral Point and CG calculator thanks to Ben Lanterman...

http://www.geistware.com/rcmodeling/cg_super_calc.htm


_____________________________

Bruce-
Proudly wasting balsa since 1965.

Free Flighters go that extra mile........

(in reply to ubird1)
       Post #: 13

RE: Collecting material for a FAQ - 3/4/2005 9:39:23 AM   
hypersoniq



Posts: 128
Joined: 1/30/2005
From: Schuylkill Haven, PA, USA
Status: offline 		this is a valuable source for all types of online calculators pertaininag to RC airplanes...
http://www.coloradogliders.com/tools.htm

_____________________________

There are 10 kinds of people in the world...
Those that understand binary and those who don't.

(in reply to BMatthews)
       Post #: 14

RE: Collecting material for a FAQ - 3/4/2005 9:24:15 PM   
BMatthews



Posts: 8797
Joined: 10/4/2002
From: Burnaby, BC, CANADA
Status: offline 		Our own Cafeenman has a site with some good material on it.

quote:

ORIGINAL: CafeenMan

This is an article I've been working on over the past several months. It is simply my approach to model aircraft design. Others may do things differently and end up with as good or better results.

The one thing I keep seeing in this forum and in my e-mail is people asking how big a plane to build for any given engine. Personally I think that is the wrong question to be asking.

The "right" question is given an engine, how do you design an airplane that performs like you want it to? My answer is to choose an overall weight and a wing loading which allows you to figure out a wing area. From there you select other parameters for the wing such as airfoil, aspect ratio, etc.

Anyway, I don't want to rewrite the entire article, but I would like to get feedback from those who read it.

Step-By-Step Model Aircraft Design





_____________________________

Bruce-
Proudly wasting balsa since 1965.

Free Flighters go that extra mile........

(in reply to hypersoniq)
       Post #: 15

RE: Collecting material for a FAQ - 3/12/2005 7:24:19 AM