RC India
Home Help Calendar Login Register
Welcome Guest, please login or register.
 
Pages: [1]   Go Down
0 Members and 1 Guest are viewing this topic. Topic Tools Topic Tools 
Read
« on: September 19, 2014, 12:04:11 PM »
docnayeem
Plane Lover
Forum Hero
*****

Reputation Power: 1 
docnayeem has no influence.
Offline Offline

City: Kolhapur
State: Maharashtra
RC Skills: Intermediate
Posts: 603
Join Date: Nov, 2013

Hello everyone
In one of my profile jet projects due to weight issues am being compelled to use the following aerofoil...
Please comment on what effects it will have on flying characteristics
IMG_20140919_115859.jpg
Different aerofoil...
* IMG_20140919_115859.jpg (43.93 KB, 600x800 - viewed 511 times.)
Logged
 

Read
« Reply #1 on: September 19, 2014, 01:24:26 PM »
RCNeil21
Plane Lover
Forum Hero

*****

Reputation Power: 13 
RCNeil21 has no influence.
Offline Offline

City: mumbai
State: Maharashtra
RC Skills: Beginner
Posts: 1041
Join Date: May, 2013

Patient Zero
Sirji why not use a kfm4? Will be similar in weight to what you have made. Even a kf2 should work.
Logged
Build planes like feathers rather than tanks, both handle bullets equally well.
 

Read
« Reply #2 on: September 19, 2014, 01:45:39 PM »
allthatido
Plane Lover
Forum Hero

*****

Reputation Power: 11 
allthatido has no influence.
Offline Offline

City: Mumbai
State: Maharashtra
RC Skills: Intermediate
Posts: 910
Join Date: Apr, 2009

Happy is a man whose hobby is his profession
Flying characteristics may not be affected much but strength yes and in a big way. The creation of 2 notch areas would result in accumalation of stress and failure at these points.

Providing a gradual curve at these sharp bends may help.
IMG_20140919_115859.jpg
Re: Different aerofoil...
* IMG_20140919_115859.jpg (51.12 KB, 800x600 - viewed 399 times.)
Logged
www.allthatido.com
 

Read
« Reply #3 on: September 19, 2014, 02:25:34 PM »
docnayeem
Plane Lover
Forum Hero
*****

Reputation Power: 1 
docnayeem has no influence.
Offline Offline

City: Kolhapur
State: Maharashtra
RC Skills: Intermediate
Posts: 603
Join Date: Nov, 2013
Re:
@Rcniel no kfm4 is a bi symmetrical aerofoil but mine cannot be changed am stuck with the above mentioned aerofoil
@allthatido strength is not a issue as its reinforced..
Logged
 

Read
« Reply #4 on: September 19, 2014, 02:26:25 PM »
docnayeem
Plane Lover
Forum Hero
*****

Reputation Power: 1 
docnayeem has no influence.
Offline Offline

City: Kolhapur
State: Maharashtra
RC Skills: Intermediate
Posts: 603
Join Date: Nov, 2013
Re:
I said  think The undercamber is gonna change the flying characteristics...  In what way am not sure
Logged
 

Read
« Reply #5 on: September 19, 2014, 03:39:28 PM »
RCNeil21
Plane Lover
Forum Hero

*****

Reputation Power: 13 
RCNeil21 has no influence.
Offline Offline

City: mumbai
State: Maharashtra
RC Skills: Beginner
Posts: 1041
Join Date: May, 2013

Patient Zero
Cannot be changed? Has the wing with this airfoil already been built?

the undercamber should be gradual, this airfoil has sharp edges. And undercambered wings on jets is very different from what ive seen.
Logged
Build planes like feathers rather than tanks, both handle bullets equally well.
 

Read
« Reply #6 on: September 19, 2014, 04:47:36 PM »
aditya
Innovator
Plane Lover
Forum Veteran

****

Reputation Power: 4 
aditya has no influence.
Offline Offline

City: new delhi
State: Delhi
RC Skills: Beginner
Posts: 309
Join Date: Nov, 2009
Is it really airfoil ? By shaping it in curve may help in streamline flow ..
Corners may produce a lot of turbulence .
The turning of the air in the vicinity of the airfoil creates curved streamlines which results in lower pressure on one side and higher pressure on the other.
Logged
Mechanical Engineer
 

Read
« Reply #7 on: September 19, 2014, 05:42:49 PM »
docnayeem
Plane Lover
Forum Hero
*****

Reputation Power: 1 
docnayeem has no influence.
Offline Offline

City: Kolhapur
State: Maharashtra
RC Skills: Intermediate
Posts: 603
Join Date: Nov, 2013
Re:
@Rcniel21 A flat wing is ready ...  But now my wing loading is high ( coz am experimenting with a new material)  so I need to cut out the center bulk to reduce weight  and cover the upper portion of the cut part and that will turn out to be the above aerofoil..
@aditya that's just a schematic representation
Logged
 

Read
« Reply #8 on: September 19, 2014, 05:48:05 PM »
topalle
Topalle Srinivas Azad
Plane Lover
Forum Hero
*****

Reputation Power: 13 
topalle has no influence.
Offline Offline

City: Bangalore
State: Karnataka
RC Skills: Beginner
Posts: 1000
Join Date: Jul, 2012
You can cover the bottom surface with some other lighter material maybe?
Logged
Amateur photographer ... DIY enthusiast ... Scratch Builder... Student-Innovator
 

Read
« Reply #9 on: September 19, 2014, 06:04:07 PM »
sanjayrai55
Plane Lover
Forum Hero

*****

Reputation Power: 85 
sanjayrai55 is a force to reckon with.sanjayrai55 is a force to reckon with.sanjayrai55 is a force to reckon with.sanjayrai55 is a force to reckon with.sanjayrai55 is a force to reckon with.sanjayrai55 is a force to reckon with.sanjayrai55 is a force to reckon with.sanjayrai55 is a force to reckon with.
Offline Offline

City: Gurgaon
State: Haryana
RC Skills: Intermediate
Posts: 8337
Join Date: Dec, 2011

Don't wake a Tiger until you've factored the teeth
Make a new wing. As allthathedoes said you have stress concentration points. The heavy undercamber with the unevenness will cause more lift, but with unpredictable turbulence
Logged
Sanjay - Gravity is my enemy

http://www.rcindia.org/rc-people/builds-i-have-posted-on-rci/
 

Read
« Reply #10 on: September 19, 2014, 06:41:30 PM »
docnayeem
Plane Lover
Forum Hero
*****

Reputation Power: 1 
docnayeem has no influence.
Offline Offline

City: Kolhapur
State: Maharashtra
RC Skills: Intermediate
Posts: 603
Join Date: Nov, 2013
Re:
Rai sir the model is already made... And wing cannot be changed...  If I smoothen the undercamber curvature will it help?
Logged
 

Read
« Reply #11 on: September 19, 2014, 06:50:27 PM »
allthatido
Plane Lover
Forum Hero

*****

Reputation Power: 11 
allthatido has no influence.
Offline Offline

City: Mumbai
State: Maharashtra
RC Skills: Intermediate
Posts: 910
Join Date: Apr, 2009

Happy is a man whose hobby is his profession
Quote from: sanjayrai55 on September 19, 2014, 06:04:07 PM
..As allthathedoes said..

Lol, could not have expected this..ha ha  Grin

@Docnayeem
Can you post a pic of the wing. The chain is as strong as the weakest link. And your weak links are the notches here. Even if you cover the wing, you cant stop stress from travelling to the notch and breaking it. Trust me , I am a mechanical engineer like Sanjay Ji, just not from IIT..he he  Tongue
Logged
www.allthatido.com
 

Read
« Reply #12 on: September 19, 2014, 10:25:13 PM »
v2 eagle
AK
Plane Lover
Forum Hero

*****

Reputation Power: 12 
v2 eagle has no influence.
Offline Offline

City: chennai
State: Tamil Nadu
RC Skills: Beginner
Posts: 1178
Join Date: Jun, 2013
To lighten the wing ribs, you can cut slots in the ribs instead of cutting like this.
Should be somewhere in this website: http://www.airfieldmodels.com/
Just my two cents...
Ashok.P
Logged
FPV with head goggles

http://ashokpkumar.wix.com/mysite
 

Read
« Reply #13 on: September 19, 2014, 10:34:19 PM »
K K Iyer
Global Moderator
Forum Hero
*****

Reputation Power: 61 
K K Iyer is a rising star!K K Iyer is a rising star!K K Iyer is a rising star!K K Iyer is a rising star!K K Iyer is a rising star!K K Iyer is a rising star!
Offline Offline

City: Indore
State: Madhya Pradesh
RC Skills: Intermediate
Posts: 5180
Join Date: Jan, 2012
@docnayeem sir,
Refrained from responding as the pic you posted is not exactly an aerofoil at all...
Unable to guess why you have such a section at all (there are other ways of reducing weight, like cutting holes)
Best solution seems to be to put a spar, ribs and covering from below...
Logged
 

Read
« Reply #14 on: September 19, 2014, 10:39:41 PM »
RCNeil21
Plane Lover
Forum Hero

*****

Reputation Power: 13 
RCNeil21 has no influence.
Offline Offline

City: mumbai
State: Maharashtra
RC Skills: Beginner
Posts: 1041
Join Date: May, 2013

Patient Zero
What is WS? Maybe you can cut LE and TE sections leaving only the flat plate, then make kfm2?

Iyer sir is right putting in ribs and covering looks like the only option  option but could add weight to your plane.

Does the jet fly with this configuration?
Logged
Build planes like feathers rather than tanks, both handle bullets equally well.
 

Read
« Reply #15 on: September 20, 2014, 10:59:50 AM »
docnayeem
Plane Lover
Forum Hero
*****

Reputation Power: 1 
docnayeem has no influence.
Offline Offline

City: Kolhapur
State: Maharashtra
RC Skills: Intermediate
Posts: 603
Join Date: Nov, 2013
Re:
Thanks Ashok sir
Logged
 

Read
« Reply #16 on: September 20, 2014, 11:01:18 AM »
docnayeem
Plane Lover
Forum Hero
*****

Reputation Power: 1 
docnayeem has no influence.
Offline Offline

City: Kolhapur
State: Maharashtra
RC Skills: Intermediate
Posts: 603
Join Date: Nov, 2013
Re:
Iyer Sir I totally understand your dilemma my representation was probably wrong...  Will post a pic and this should put things in a better prospective
Logged
 

Read
« Reply #17 on: September 20, 2014, 11:17:28 AM »
docnayeem
Plane Lover
Forum Hero
*****

Reputation Power: 1 
docnayeem has no influence.
Offline Offline

City: Kolhapur
State: Maharashtra
RC Skills: Intermediate
Posts: 603
Join Date: Nov, 2013
Schematic diagram of the model
IMG_20140920_111137.jpg
Re: Different aerofoil...
* IMG_20140920_111137.jpg (34.62 KB, 600x800 - viewed 349 times.)
Logged
 

Read
« Reply #18 on: September 20, 2014, 11:18:51 AM »
docnayeem
Plane Lover
Forum Hero
*****

Reputation Power: 1 
docnayeem has no influence.
Offline Offline

City: Kolhapur
State: Maharashtra
RC Skills: Intermediate
Posts: 603
Join Date: Nov, 2013
Dotted lines depict the part of the wing I plan to cut ( to reduce weight)
IMG_20140920_111235.jpg
Re: Different aerofoil...
* IMG_20140920_111235.jpg (46.86 KB, 600x800 - viewed 318 times.)
« Last Edit: September 20, 2014, 11:43:47 AM by docnayeem » Logged
 

Read
« Reply #19 on: September 20, 2014, 12:19:06 PM »
docnayeem
Plane Lover
Forum Hero
*****

Reputation Power: 1 
docnayeem has no influence.
Offline Offline

City: Kolhapur
State: Maharashtra
RC Skills: Intermediate
Posts: 603
Join Date: Nov, 2013
Re:
And then the top surface will be covered with 2mm coro...  And that's how that aerofoil (if I can call it aerofoil)  will look like...
I hope am able to put things across the table ? *
Logged
 

Read
« Reply #20 on: September 20, 2014, 01:25:04 PM »
topalle
Topalle Srinivas Azad
Plane Lover
Forum Hero
*****

Reputation Power: 13 
topalle has no influence.
Offline Offline

City: Bangalore
State: Karnataka
RC Skills: Beginner
Posts: 1000
Join Date: Jul, 2012
You can use much lighter depron fot that job
Logged
Amateur photographer ... DIY enthusiast ... Scratch Builder... Student-Innovator
 

Read
« Reply #21 on: September 20, 2014, 07:37:23 PM »
K K Iyer
Global Moderator
Forum Hero
*****

Reputation Power: 61 
K K Iyer is a rising star!K K Iyer is a rising star!K K Iyer is a rising star!K K Iyer is a rising star!K K Iyer is a rising star!K K Iyer is a rising star!
Offline Offline

City: Indore
State: Madhya Pradesh
RC Skills: Intermediate
Posts: 5180
Join Date: Jan, 2012
@docnayeem,
Sir,
If you have not yet cut into the material, you can consider the following:
1. Sand to a reasonably streamlined aerofoil type shape
2. Mark from tip to tip, about 30% from LE and about 15% from TE.
3. In the intervening 55%, cut circular holes to reduce weight.
4. Cover with iron on film or laminating sheet.
Logged
 

Pages: [1]   Go Up
RC India  RC Models  Electric Planes  Topic: Different aerofoil...
« previous next »
Jump to:  

Related Topics
Subject Started by Replies Views Last post
Yak 54, 30" wingspan, this time with symmetrical aerofoil
Electric Planes 		ashJR7202 14 10222 Last post January 05, 2011, 06:44:31 PM
by saurabhhsrivastavaa
What kind of Aerofoil is this
RC General Topics 		ujjwaana 17 11369 Last post November 09, 2010, 02:26:35 AM
by findvikas
This is aerofoil, winger, or what?
Kites, Trains, Free Flight and All Others 		yashb 8 7609 Last post April 15, 2011, 11:37:47 PM
by abhay
Flat wing or aerofoil?
RC General Topics 		topalle 3 2758 Last post September 17, 2013, 03:06:50 PM
by rastsaurabh
under cambered aerofoil wing built what to use it for?
Self-designed, DIY and College Projects 		topalle 14 9440 Last post December 01, 2013, 09:06:49 PM
by theleabres
Powered by SMF 1.1.21 | SMF © 2015, Simple Machines
Simple Audio Video Embedder 		Realized by Systalent | XHTML | CSS