Wattflyer RC Network: RC Universe :: RCU Magazine :: RCU Forums :: RCU Classifieds :: RCU User Reviews :: RCU YouTube
Home Who's Online Calendar Today's Posts RealTime Post Spy Mark Forums Read
Go Back   WattFlyer RC Electric Flight Forums - Discuss radio control eflight > R/C Electric Topics - General > Aerodynamics
Register Members List Wattflyer Extras Articles Search Today's Posts Mark Forums Read Social Groups

Aerodynamics Discuss the concepts of aerodynamics here

Thank you for your support (hide ads)
Thread Tools Display Modes
Old 09-16-2018, 08:16 AM   #1
Join Date: Aug 2018
Location: i live in chennai, tamil nadu, India
Posts: 68
Thanked 8 Times in 7 Posts
iTrader: (0)
Friends: (4)
Default Experiment with a new shape of Airfoil for my glider

I am building an RC glider. It's under construction. I came up with an idea of a sharp leading edge airfoil for that glider.
Click image for larger version

Name:	Airfoil shape.png
Views:	4
Size:	22.7 KB
ID:	186951
This type of airfoils are typically used at supersonic speeds. But to achieve a higher lift to drag ratio, I thought of this symmetric airfoil with sharp leading edge for gliders.

I conducted a small experiment with two chuck gliders. Both identical in dimensions. But one glider having a rounded leading edge and the other having a sharp leading edge. Both being symmetrical.

The sharp leading edge airfoil, due to its less drag kept flying straight, like an arrow everytime I launched it. Here is the video of my experiment.

Now I am going to built a wing with this type of airfoil for my RC glider.

aaindthu is offline  
  Reply With Quote
Old 10-01-2018, 11:23 PM   #2
Super Contributor
quorneng's Avatar
Join Date: Jul 2008
Location: Cheshire, UK
Posts: 1,785
Thanked 89 Times in 85 Posts
Club: A lone flyer!
Awards Showcase

Scratchbuilders Award  Scratchbuilders Award 
iTrader: (0)
Friends: (6)

It good to experiment but I am not sure the test was really rigorous enough to confirm that the sharp edged aerofoil was actually better.
For instance are you sure the fact that one flew straight and the other didn't was not due to small differences in the wings?
A sharp edged wing is indeed likely to create less drag than a conventional one when it is generating no lift but the drag will rise more rapidly than the conventional one when it is set at an angle to the airflow necessary to generate lift.
Just keep experimenting!
quorneng is offline  
  Reply With Quote
Old 10-02-2018, 08:12 AM   #3
Super Contributor
CHELLIE's Avatar
Join Date: Oct 2006
Location: Hesperia, So. Calif
Posts: 19,167
View CHELLIE's Gallery13
Thanked 2,267 Times in 2,166 Posts
Club: Chino Renegades RC Flying Club
Awards Showcase

Scratchbuilders Award  Scratchbuilders Award  Ambassador Award  100mph Speed Demon 
iTrader: (4)
Friends: (328)

it will work, but its not for a slow flying glider, if your plane was going to fly at Mach 2 then it would be ok LOL

I may be getting Older, But I Refuse to grow Up I am Having to much Fun to Grow Up LOL
CHELLIE is offline  
  Reply With Quote
Old 10-02-2018, 08:21 AM   #4
Super Contributor
solentlife's Avatar
Join Date: Oct 2010
Location: Ex UK Brit now in Latvia west coast - Ventspils
Posts: 11,784
View solentlife's Gallery47
Thanked 568 Times in 558 Posts
Club: Founder Member Ventspils RC Club. Ex Waltham Chase and Meon Valley Soaring.
Awards Showcase

Scratchbuilders Award  Scratchbuilders Award  Outstanding Contributor Award  125mph Speed Demon 
iTrader: (0)
Friends: (19)

There is one inherent problem with sharp LE ... critical angle to airflow.

As Q mentions - there is a sharp change in its ability to sustain lift.

It is actually not correct to say a fast aircraft has a sharp LE ........ what is true is that such aircraft have a THIN wing .... the old EE Lightning is a prime example of this. BUT they still had ROUNDED LE for very good reason.

As the wing angle of attack changes - the LE presents a different attitude to the oncoming airflow. If its rounded - the airflow will remain good for a reasonable change of angle, but make that LE sharp - a small change in angle of attack and now you have a turbulent disrupted airflow.

The sharp entry would only benefit 'maybe' in perfectly straight level flight with no requirement to pitch up / down.

Its actually a phenomenon we see with flat plate wings when you don't sand a rounded LE.


222kph PKJ,EDF Concorde, Mini4,Mig3,T45,PKJ twin,ME109,Edge540,Cessna182,Skymaster Biplane,F15,F16,Badius,Ultimate,SE5,Qbee10,450 Heli,V911,J3 Cub Founder 9x forum: http://groups.yahoo.com/group/Flysky_RC_radio/
- Subscribe my Youtube: "solentlifeuk"
solentlife is offline  
  Reply With Quote

  WattFlyer RC Electric Flight Forums - Discuss radio control eflight > R/C Electric Topics - General > Aerodynamics

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
2 Meter Glider Conversion to Electric - Sample Package AEAJR Beginners 28 02-16-2016 01:19 AM
Lets Stir Some Worms, Airfoil Myth CHELLIE Off Topic Chit Chat 23 09-23-2014 08:48 PM
JPower 50mm EDF V-Tail Jet Glider Joe 1320 Electric Ducted Fan Jets 4 06-03-2013 03:53 PM

All times are GMT +1. The time now is 02:09 AM.

Powered by: vBulletin
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.
Copyright 2005 WattfFlyer.com
RCU Eflight HQ

Charities we support Select: Yorkie Rescue  ::  Crohn's & Colitis Foundation

Page generated in 0.11492 seconds with 29 queries