RC India
Welcome Guest, please login or register.
 
Pages: [1] 2  All   Go Down
0 Members and 1 Guest are viewing this topic. Topic Tools Topic Tools 
Read
« on: January 24, 2011, 07:29:57 AM »
azhaguvel
Plane Lover
Forum Veteran

****

Reputation Power: 5 
azhaguvel has no influence.
Offline Offline

City: trivandrum
State: Kerala
RC Skills: Beginner
Posts: 393
Join Date: Sep, 2010




I want a airfoil design for a trainer. Can some one give a airfoil template so that i can just print & cut it out.
Logged
 

Read
« Reply #1 on: January 24, 2011, 09:39:35 AM »
sandeepm
Plane Lover
Forum Hero

*****

Reputation Power: 14 
sandeepm has no influence.
Offline Offline

City: Mumbai
State: Maharashtra
RC Skills: Intermediate
Posts: 997
Join Date: Mar, 2009



I have used PROFILI, a free download air foil program. it is good but limited functionality.

http://www.aerodesign.de/

Sandeep
Logged

Fly high if you have good set of batteries.....!
 

Read
« Reply #2 on: January 24, 2011, 01:59:02 PM »
azhaguvel
Plane Lover
Forum Veteran

****

Reputation Power: 5 
azhaguvel has no influence.
Offline Offline

City: trivandrum
State: Kerala
RC Skills: Beginner
Posts: 393
Join Date: Sep, 2010



Thanks sandeep.
I am begginer so can you tell me the relation between chord length & wing span. Is there is one Smiley?
Logged
 

Read
« Reply #3 on: January 24, 2011, 02:13:41 PM »
bmblb
Plane Lover
Forum Veteran

****

Reputation Power: 5 
bmblb has no influence.
Offline Offline

City: Bengaluru
State: Karnataka
RC Skills: Intermediate
Posts: 312
Join Date: Apr, 2010



Suggest you do a search on Clark Y.....you may also want to do some basic reading on airfoils.

good luck!
Logged

"The Flight Of The Bumblebee"
 

Read
« Reply #4 on: January 24, 2011, 02:21:02 PM »
dileepbalan
Plane Lover
Senior Member

***

Reputation Power: 3 
dileepbalan has no influence.
Offline Offline

City: Coimbatore / Vaikom, Kottayam, Kerala
State: Kerala
RC Skills: Beginner
Posts: 178
Join Date: May, 2010



Like Anwar bhai always suggests, search the same here first.  Wink
http://www.rcindia.org/electric-planes/wing-span-and-fuse-length/

Regards,
Dileep
Logged

Spektrum DX6i | AXN Floater-Jet
 

Read
« Reply #5 on: January 24, 2011, 02:37:12 PM »
bmblb
Plane Lover
Forum Veteran

****

Reputation Power: 5 
bmblb has no influence.
Offline Offline

City: Bengaluru
State: Karnataka
RC Skills: Intermediate
Posts: 312
Join Date: Apr, 2010



 since I am online, thought I'd just add a few points for Sandeep to elaborate later on.

 In simple terms, the relation between span and chord  is known as aspect ratio.

 Typically, a trainer's chord is 1/6th of its span. For example, a trainer with span of 36 in should have a chord of 6 in. However, if you wish to make a glider with a wing of the same span, then the chord should be 1/9th of the span, or 4in.

 Thickness of the airfoil is also important depending on the application.

 However, for the time being lets consider the following Example that you can follow if you wish:

1. Span - 48 in.
2. Chord - 48/6=8 in
3. Thickness of the airfoil - 8 to 12 % of the chord
     
    This means, the thickest point of the airfoil* should measure anywhere between 8 to 12% of the chord. So for a chord of 8 in, the thickness could vary between 1 to .66 in ( or 2.54cm to 1.67cm). I'd recommend 1 in at least.

 * The location of the thickest point of the airfoil is usually 1/3 the distance from the leading edge of the wing. In this example, that would be 2.66 in from the LE.

** The range of the thickness can vary beyond 8-12%. A thicker airfoil is slower, creates more lift and hence most suited for trainers.

 You can also go to http://www.ae.illinois.edu/m-selig/ads/coord_database.html 
and click any of the alphabets - this would open up a series of airfoils.

 But there's a lot you can read on the net.... Thumbs Up



   
Logged

"The Flight Of The Bumblebee"
 

Read
« Reply #6 on: January 24, 2011, 04:32:52 PM »
azhaguvel
Plane Lover
Forum Veteran

****

Reputation Power: 5 
azhaguvel has no influence.
Offline Offline

City: trivandrum
State: Kerala
RC Skills: Beginner
Posts: 393
Join Date: Sep, 2010



Nice to see more people coming for help.  Grin

chord is the distance between leading edge & trailing edge.
Wing span is distance between two wing tips.

airfoil.jpg
Re: Airfoil for trainer
* airfoil.jpg (15.42 KB, 480x266 - viewed 2490 times.)
Logged
 

Read
« Reply #7 on: January 24, 2011, 05:16:54 PM »
azhaguvel
Plane Lover
Forum Veteran

****

Reputation Power: 5 
azhaguvel has no influence.
Offline Offline

City: trivandrum
State: Kerala
RC Skills: Beginner
Posts: 393
Join Date: Sep, 2010



Awesome explaination  Clap Clap Clap Bow Bow Bow

thanks bmblb.
Logged
 

Read
« Reply #8 on: January 24, 2011, 07:35:54 PM »
azhaguvel
Plane Lover
Forum Veteran

****

Reputation Power: 5 
azhaguvel has no influence.
Offline Offline

City: trivandrum
State: Kerala
RC Skills: Beginner
Posts: 393
Join Date: Sep, 2010



Like wise is there a dimension for

1. The vertical & horizontal stabilizer which should be there for a particular airfoil (chord length, wing span & thickness of airfoil).

2. Fuselage length from the wing to the point where it has vertical & horizontal stabilizer?
Logged
 

Read
« Reply #9 on: January 24, 2011, 07:54:23 PM »
xxkrishxx
Plane Lover
Forum Hero

*****

Reputation Power: 10 
xxkrishxx has no influence.
Offline Offline

City: Bangalore/Vellakovil
State: Tamil Nadu
RC Skills: Beginner
Posts: 834
Join Date: May, 2010

FLY HIGH...!!!



U can find an article as how to design ur own spad in spadworld.net forum..In tat each n every relationship is explained..
Logged

BalaKrishnan
Mechanical engineer..

Radio:Spektrum Dx6i | Futaba 6EXP | working on coro Avispad | HK450MT kit | Seagull Boomerang 40 | HK 250GT | Upcoming: Easy Star 2 |
 

Read
« Reply #10 on: January 24, 2011, 11:05:22 PM »
azhaguvel
Plane Lover
Forum Veteran

****

Reputation Power: 5 
azhaguvel has no influence.
Offline Offline

City: trivandrum
State: Kerala
RC Skills: Beginner
Posts: 393
Join Date: Sep, 2010



I got a software from this link
http://www.grc.nasa.gov/WWW/k-12/FoilSim/index.html
Logged
 

Read
« Reply #11 on: January 28, 2011, 12:13:53 PM »
azhaguvel
Plane Lover
Forum Veteran

****

Reputation Power: 5 
azhaguvel has no influence.
Offline Offline

City: trivandrum
State: Kerala
RC Skills: Beginner
Posts: 393
Join Date: Sep, 2010



I am planning to build a pusher

wing span - 100cm
chord length -100/7.6=> 13cm

I made the chord length so that the plane has good gliding capability.
I am using clark-Y design as bmblb suggested.

Is this ok?
Logged
 

Read
« Reply #12 on: January 28, 2011, 12:14:26 PM »
azhaguvel
Plane Lover
Forum Veteran

****

Reputation Power: 5 
azhaguvel has no influence.
Offline Offline

City: trivandrum
State: Kerala
RC Skills: Beginner
Posts: 393
Join Date: Sep, 2010



Clark y design

Clark_y.jpg
Re: Airfoil for trainer
* Clark_y.jpg (10.48 KB, 800x208 - viewed 4085 times.)
Logged
 

Read
« Reply #13 on: January 28, 2011, 01:51:32 PM »
bmblb
Plane Lover
Forum Veteran

****

Reputation Power: 5 
bmblb has no influence.
Offline Offline

City: Bengaluru
State: Karnataka
RC Skills: Intermediate
Posts: 312
Join Date: Apr, 2010



Like wise is there a dimension for

1. The vertical & horizontal stabilizer which should be there for a particular airfoil (chord length, wing span & thickness of airfoil).

The area of the vertical stab is usually 7-10% that of the wing and the horizontal stab is in the range of 15-20%. Suggest you draw simple forms which give you the approximate area and then make some changes to get the shape of your choice, without majorly altering the area. Plan for healthy size since its a trainer.

2. Fuselage length from the wing to the point where it has vertical & horizontal stabilizer?

As regards the length of the fuse, I follow this:

Wing Span/Fuselage=1.8

Fuselage=wingspan/1.8 (For example, for a wingspan of 48in, the fuselage can be anywhere from 27 to 33 in.
The Distance between the TE of the wing to the LE of the horizontal stab is the tricky one and can make considerable difference in the performance of your plane.

Start with this for the Fuse:

1. Nose to LE of Wing = 1 chord length
2. LE to TE of Wing = Chord length itself.
3. TE of Wing to LE of Hoz Stab = 1.5 to 2 times chord.

This is a crude way but will do. You may have some challenges with getting your CG at the right place.....but that is best experienced and you will eventually get it.

share pics of your plane as your progress....
Logged

"The Flight Of The Bumblebee"
 

Read
« Reply #14 on: January 28, 2011, 01:55:42 PM »
sahilkit
DEEP SEA DIVING RABBITS
Plane Lover
Forum Hero

*****

Reputation Power: 17 
sahilkit has no influence.
Offline Offline

City: Hyderabad
State: Andhra Pradesh
RC Skills: Beginner
Posts: 1442
Join Date: Mar, 2009

SANWA SD-10G & HITEC Flash 7



i think simplex airfoil is a good place to start with  Smiley
Logged

The greatest barrier to success is the fear of failure

HORROR MYSTERY WORLD HISTORY THE HOOVER DAM

Read What You Want, Just Read Responsibly.

Today might be a great and wonderful day. It depends on you.
 

Read
« Reply #15 on: January 28, 2011, 03:34:04 PM »
rcpilotacro
Global Moderator
Forum Hero

*****

Reputation Power: 58 
rcpilotacro is on the verge of being accepted.rcpilotacro is on the verge of being accepted.rcpilotacro is on the verge of being accepted.rcpilotacro is on the verge of being accepted.rcpilotacro is on the verge of being accepted.
Offline Offline

City: Delhi
State: Delhi
RC Skills: Advanced
Posts: 5040
Join Date: Nov, 2010

Practice, and only Practice will make you perfect



azhaguvel, i agree with sahil, if your chord is going to be small, then you cant risk high cambered aerofoil, reason is,  cambered aerofoil has large CP (Centre of pressure, a point at which all lifting force is said to act) movement, problems are two fold (a) you need to balance CG perfectly(which means you have very little error margin on assessing length of the aircraft) at no stage CP can go ahead CG, you will loose control. (b) stall and recovery will be an issue, high elevator throw and frequent trimming will be required.

Bhavesh's Thumb rule is bang on, for a Clark Y ?, can be tricky.

Clark Y ? think about it, for a 1M aircraft it is little too cambered.

all the best Thumbs Up

PS
I had a little hand in the NASA Foilsim, way back in 1999, if you can crack the java class file, should find my name there in one of the comments, i guess.
Logged

Gusty's Hangar and Introduction.

A Good pilot will practice until he gets it right,
A Great pilot will practice until he canít get it wrong.
 

Read
« Reply #16 on: January 28, 2011, 04:35:53 PM »
azhaguvel
Plane Lover
Forum Veteran

****

Reputation Power: 5 
azhaguvel has no influence.
Offline Offline

City: trivandrum
State: Kerala
RC Skills: Beginner
Posts: 393
Join Date: Sep, 2010



A pic of any recommended airfoil would be a great help Smiley
Logged
 

Read
« Reply #17 on: January 28, 2011, 05:38:37 PM »
rcpilotacro
Global Moderator
Forum Hero

*****

Reputation Power: 58 
rcpilotacro is on the verge of being accepted.rcpilotacro is on the verge of being accepted.rcpilotacro is on the verge of being accepted.rcpilotacro is on the verge of being accepted.rcpilotacro is on the verge of being accepted.
Offline Offline

City: Delhi
State: Delhi
RC Skills: Advanced
Posts: 5040
Join Date: Nov, 2010

Practice, and only Practice will make you perfect



I am not generalizing, however most scratch builders start with Kline Fogleman first, it was a sensation in 1974, easy build, no movement of CP. very forgiving in design inadequacies and inaccuracies, attaching image. choose your pick. if KFm appeals to you, i can send you some reading material as well (Indicate whether you need tech or non tech stuff) Thumbs Up

KFm4.jpg
Re: Airfoil for trainer
* KFm4.jpg (14.08 KB, 800x305 - viewed 2012 times.)
This post has 1 more images(s)/attachment(s). Please login or register to view them.
Logged

Gusty's Hangar and Introduction.

A Good pilot will practice until he gets it right,
A Great pilot will practice until he canít get it wrong.
 

Read
« Reply #18 on: January 28, 2011, 08:26:02 PM »
sahilkit
DEEP SEA DIVING RABBITS
Plane Lover
Forum Hero

*****

Reputation Power: 17 
sahilkit has no influence.
Offline Offline

City: Hyderabad
State: Andhra Pradesh
RC Skills: Beginner
Posts: 1442
Join Date: Mar, 2009

SANWA SD-10G & HITEC Flash 7



http://www.rcgroups.com/forums/showthread.php?t=369658

try the above link, there is a program that will generate simplex airfoil will try to post a direct link

sahil
Logged

The greatest barrier to success is the fear of failure

HORROR MYSTERY WORLD HISTORY THE HOOVER DAM

Read What You Want, Just Read Responsibly.

Today might be a great and wonderful day. It depends on you.
 

Read
« Reply #19 on: January 28, 2011, 08:34:45 PM »
sahilkit
DEEP SEA DIVING RABBITS
Plane Lover
Forum Hero

*****

Reputation Power: 17 
sahilkit has no influence.
Offline Offline

City: Hyderabad
State: Andhra Pradesh
RC Skills: Beginner
Posts: 1442
Join Date: Mar, 2009

SANWA SD-10G & HITEC Flash 7



try these programs  Smiley

 http://www.hippocketaeronautics.com/hpa_plans/categories.php?cat_id=59&sessionid=4688e71830344dbc5a6007c111ed0320
Logged

The greatest barrier to success is the fear of failure

HORROR MYSTERY WORLD HISTORY THE HOOVER DAM

Read What You Want, Just Read Responsibly.

Today might be a great and wonderful day. It depends on you.
 

Read
« Reply #20 on: January 28, 2011, 10:36:54 PM »
azhaguvel
Plane Lover
Forum Veteran

****

Reputation Power: 5 
azhaguvel has no influence.
Offline Offline

City: trivandrum
State: Kerala
RC Skills: Beginner
Posts: 393
Join Date: Sep, 2010



Thanks sahil & augustinev will check out your informations
Logged
 

Read
« Reply #21 on: February 03, 2011, 01:11:05 PM »
AEROVISHWA
Its Your LIFE... Make it LARGE.....
Plane Lover
Forum Hero

*****

Reputation Power: 16 
AEROVISHWA has no influence.
Offline Offline

City: belgaum
State: Karnataka
RC Skills: Intermediate
Posts: 1320
Join Date: Feb, 2011

IN THRUST WE TRUST.....!!



sir

i think this might help.....

http://adamone.rchomepage.com/cg_calc.htm

 Head Scratching

http://adamone.rchomepage.com/index5.htm
Logged

Aerodynamics are for people who can't build engines.
-Enzo Ferrari

https://sites.google.com/site/vishveshkakkeri93/
HAPPY LANDINGS
 

Read
« Reply #22 on: February 16, 2011, 01:31:36 PM »
ved
psychic flyer!!
Plane Lover
Forum Hero
*****

Reputation Power: 8 
ved has no influence.
Offline Offline

City: Marcel
State: Goa
RC Skills: Beginner
Posts: 605
Join Date: Sep, 2010



Hi Guys
 a simple Question
 How to make a airfoil on a thermocol without using a hot wire foam cutter.
Logged

Turnigy 9x w. Er9x | Custom Hovercraft |Scratch Build Boat | Tricopter | Skysurfer V3|
 

Read
« Reply #23 on: February 16, 2011, 02:38:49 PM »
azhaguvel
Plane Lover
Forum Veteran

****

Reputation Power: 5 
azhaguvel has no influence.
Offline Offline

City: trivandrum
State: Kerala
RC Skills: Beginner
Posts: 393
Join Date: Sep, 2010



first thing is, can a thermocol be used for a wing? its very fragile & will break right?
Logged
 

Read
« Reply #24 on: February 16, 2011, 03:38:17 PM »
ved
psychic flyer!!
Plane Lover
Forum Hero
*****

Reputation Power: 8 
ved has no influence.
Offline Offline

City: Marcel
State: Goa
RC Skills: Beginner
Posts: 605
Join Date: Sep, 2010



Yes.
Logged

Turnigy 9x w. Er9x | Custom Hovercraft |Scratch Build Boat | Tricopter | Skysurfer V3|
 

Pages: [1] 2  All   Go Up
Jump to:  

Related Topics
Subject Started by Replies Views Last post
wing weight & airfoil shape
RC General Topics
JKKASTA 1 2624 Last post September 07, 2010, 06:42:54 PM
by xxkrishxx
Where can I get an EPP/EPS foam block to hotwire an airfoil
Tools, Materials and Building Techniques
ashutoshn 3 2956 Last post April 12, 2012, 01:57:48 PM
by ashutoshn
Airfoil Design
Beginners Zone
rajeshbhanushali123 8 6238 Last post May 08, 2013, 06:13:55 PM
by girishsarwal
Question: KFM3 Airfoil
Electric Planes
swapnilnimbalkar 17 5307 Last post January 15, 2017, 01:10:02 PM
by swapnilnimbalkar
AIRFOIL SIZE
Electric Planes
ARNAB RC 12 765 Last post April 19, 2019, 04:53:34 PM
by K K Iyer