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 > Electric R/C Airplanes > General Electric Discussions
Register Members List Wattflyer Extras Articles Search Today's Posts Mark Forums Read Social Groups

General Electric Discussions Talk about topics related to e-powered RC flying

Thank you for your support (hide ads)
Reply
 
Thread Tools Display Modes
Old 01-18-2013, 02:49 AM   #1
Beemerider
Member
 
Beemerider's Avatar
 
Join Date: Mar 2012
Location: Shenandoah Valley Of Virginia
Posts: 393
Thanked 9 Times in 9 Posts
Club: Augusta County RC Club
iTrader: (0)
Friends: (1)
Default Concerning wing tips........

How does the shape of a wing tip affect wing performance? I guess specifically I'm trying to decide if I should put effort into fashioning proper wing tips for an older 2M sailplane I'm rebuilding and covering. The original tips were formed plastic. This is just a lazy flier for a nice day. I'm not after performance, I guess I'm trying to be lazy and wanting someone to say it's ok!
Beemerider is offline  
  Reply With Quote
Old 01-18-2013, 03:38 AM   #2
dgjessing
Member
 
Join Date: Jul 2012
Location: Columbus, OH USA
Posts: 540
Thanked 12 Times in 12 Posts
Club: Westerville Model Aeronautics Assoc.
iTrader: (0)
Friends: (0)
Default

It's OK with me

Dave
AMA #56519
dgjessing is offline  
  Reply With Quote
Old 01-18-2013, 03:42 AM   #3
mclarkson
Super Contributor
 
mclarkson's Avatar
 
Join Date: May 2010
Location: Wichita, KS
Posts: 3,014
View mclarkson's Gallery4
Thanked 182 Times in 180 Posts
Awards Showcase

Scratchbuilders Award  Outstanding Contributor Award 
iTrader: (0)
Friends: (7)
Default

Me too!

mclarkson is offline  
  Reply With Quote
Old 01-18-2013, 05:38 AM   #4
solentlife
Super Contributor
 
solentlife's Avatar
 
Join Date: Oct 2010
Location: Ex UK Brit now in Latvia west coast - Ventspils
Posts: 6,199
View solentlife's Gallery47
Thanked 266 Times in 263 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: (15)
Default

Wing Tips ............

For years and still now ... we have plain tips. For general flight there's nothing wrong with them.

Then we have shaped form tips to overcome tip vortex's, tip losses, to try and direct airflow.
My Cessna 182 has tips that are shaped with a definite 'tuck under' .. this is supposed to reduce air bleed round the tip ...

I think in model sizes - the benefits of shaped tips is questionable. Look at full size - it took Boeing / Airbus years to get around to added Winglets to the tips and still many are built without.

Go fly as is !! I would.

Nigel

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
Old 01-18-2013, 01:02 PM   #5
Beemerider
Member
 
Beemerider's Avatar
 
Join Date: Mar 2012
Location: Shenandoah Valley Of Virginia
Posts: 393
Thanked 9 Times in 9 Posts
Club: Augusta County RC Club
iTrader: (0)
Friends: (1)
Default

That's what I wanted to hear. Thanks!
Beemerider is offline  
  Reply With Quote
Old 01-18-2013, 01:37 PM   #6
rreid7
Member
 
rreid7's Avatar
 
Join Date: Jul 2012
Location: North East, MD
Posts: 81
Thanked 6 Times in 6 Posts
Club: AMA #987422
iTrader: (0)
Friends: (0)
Default

I read somewhere recently (I've forgotten the exact source) that Cessna's engineers experimented with drooped wing tips back in the 70's. They concluded that they didn't do much unless they were quite exaggerated, so they dropped the idea from a performance stand-point. However, the marketing guys thought they looked cool and most single engine Cessnas (150, 172, 182, etc.) since have worn molded, modestly drooped wing tips.

rreid7 is offline  
  Reply With Quote
Old 01-18-2013, 10:46 PM   #7
cyclops2
Super Contributor
 
Join Date: Dec 2005
Location: New Jersey
Posts: 1,956
Thanked 43 Times in 41 Posts
iTrader: (0)
Friends: (1)
Default

My love... The real A-10 had wing tips. Then took them off. Says you must need to be moving pretty fast to justify them.

My 3 cents.
cyclops2 is offline  
  Reply With Quote
Old 01-19-2013, 12:57 PM   #8
CHELLIE
Super Contributor
 
CHELLIE's Avatar
 
Join Date: Oct 2006
Location: Hesperia, So. Calif
Posts: 18,675
View CHELLIE's Gallery13
Thanked 2,181 Times in 2,088 Posts
Club: Chino Renegades RC Flying Club
Awards Showcase

Scratchbuilders Award  Scratchbuilders Award  Ambassador Award  100mph Speed Demon 
iTrader: (4)
Friends: (314)
Default

It's OK with me Too

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 01-19-2013, 03:40 PM   #9
tobydogs
love to build!
 
tobydogs's Avatar
 
Join Date: Jan 2010
Location: nj usa
Posts: 2,997
Thanked 198 Times in 195 Posts
Club: rcrcc rockland county,ny
Awards Showcase

Outstanding Contributor Award 
iTrader: (0)
Friends: (17)
Default

ITS NOT OK WITH ME SO DON'T DO IT!!!! I WILL FIND YOUR WINGTIP LESS GLIDER NO MATTER HOW HIGH YOU FLY AND DESTROY IT FOR NOT BEING RESTORED TO THE ORIGINAL PLASTIC TIPS!!! THIS IS A CRIME OF UNPRECEDENTED PROPORTION'S AND MUST BE REPORTED TO ALL,YES ALL THE WATTFLYER MODERATORS!!!!

THERE WILL NOW BE AN OFFICIAL VOTE DISCOUNTING THE PREVIOUS POSTERS AND THEIR BIAS,INCONSIDERATE OPINIONS OR CONSIDERATIONS OF THE DISCUSSION ON WING TIPS.




opps,sorry about that,just took a sip of my coffee and feel better now...................it's ok with me too.

narrow is the place to land...wide is the space to crash....choose the narrow way!
tobydogs is online now  
  Reply With Quote
Old 01-19-2013, 09:56 PM   #10
mclarkson
Super Contributor
 
mclarkson's Avatar
 
Join Date: May 2010
Location: Wichita, KS
Posts: 3,014
View mclarkson's Gallery4
Thanked 182 Times in 180 Posts
Awards Showcase

Scratchbuilders Award  Outstanding Contributor Award 
iTrader: (0)
Friends: (7)
Default

I'm confused now. Are we talking about wing tip shape? Or winglet shape?

mclarkson is offline  
  Reply With Quote
Old 01-20-2013, 12:08 AM   #11
Beemerider
Member
 
Beemerider's Avatar
 
Join Date: Mar 2012
Location: Shenandoah Valley Of Virginia
Posts: 393
Thanked 9 Times in 9 Posts
Club: Augusta County RC Club
iTrader: (0)
Friends: (1)
Default

My question was concerning tip shape, not winglets. As in squared off vs tapered (probably wrong terminology).

More specifically---lazy shortcut vs doing it "the right way".
Beemerider is offline  
  Reply With Quote
Old 01-20-2013, 12:35 AM   #12
mclarkson
Super Contributor
 
mclarkson's Avatar
 
Join Date: May 2010
Location: Wichita, KS
Posts: 3,014
View mclarkson's Gallery4
Thanked 182 Times in 180 Posts
Awards Showcase

Scratchbuilders Award  Outstanding Contributor Award 
iTrader: (0)
Friends: (7)
Default

I suspect that the differences between a square and rounded wing tip are minimal in subsonic flight with a 12oz foam plane.

Looking at fast planes, I see that many of them have rounded wingtips, but just as many have square wingtips. Look at the 'Rare Bear' (Grumman F8F Bearcat) or the Mustang. OTOH, the Spitfire's wings are lovelier.

mclarkson is offline  
  Reply With Quote
Old 01-20-2013, 12:41 AM   #13
Beemerider
Member
 
Beemerider's Avatar
 
Join Date: Mar 2012
Location: Shenandoah Valley Of Virginia
Posts: 393
Thanked 9 Times in 9 Posts
Club: Augusta County RC Club
iTrader: (0)
Friends: (1)
Default

Originally Posted by mclarkson View Post
I suspect that the differences between a square and rounded wing tip are minimal in subsonic flight with a 12oz foam plane.
My 2 meter sailplane weighs in around 32oz, I expect I'll get fairly close to supersonic in a full power on dive so maybe I should think about rounded wing tips?
Beemerider is offline  
  Reply With Quote
Old 01-20-2013, 01:15 AM   #14
rreid7
Member
 
rreid7's Avatar
 
Join Date: Jul 2012
Location: North East, MD
Posts: 81
Thanked 6 Times in 6 Posts
Club: AMA #987422
iTrader: (0)
Friends: (0)
Default

Rounded wingtips are purely cosmetic. Everything from Cubs to Spitfires have have had them clipped off to reduce weight and drag and increase speed and roll rate. There is no loss of lift, just of prettiness.

rreid7 is offline  
  Reply With Quote
Old 01-20-2013, 03:58 AM   #15
tobydogs
love to build!
 
tobydogs's Avatar
 
Join Date: Jan 2010
Location: nj usa
Posts: 2,997
Thanked 198 Times in 195 Posts
Club: rcrcc rockland county,ny
Awards Showcase

Outstanding Contributor Award 
iTrader: (0)
Friends: (17)
Default

plus 1+ on it cosmetics. even full scale cubs and bipe had clipped wing designed into the wings.

i built the greatplanes rv 4-40 that had plastic molded wing tips that were very curvy and cool looking . i left them off as they would also be a weak spot if the wing tip ever touched on landing or take off. it still looked beautiful as a clipped wing rv 4-40 until my cheap esc cut out to cause total failure on its first flight from building a new wing. it was a total loss. i hate to say this,but i want to build another one someday and hope to get the wing not to warp due to the dumbest design i ever had the displeasure to build...lol.....man i wish i had used a castle 100amp ice esc with the eflight power 60,she might still be around to enjoy.

RIP:


Attached Thumbnails
Click image for larger version

Name:	funjet ultra 065.jpg
Views:	21
Size:	121.7 KB
ID:	165690   Click image for larger version

Name:	funjet ultra 061.jpg
Views:	19
Size:	101.3 KB
ID:	165691  

narrow is the place to land...wide is the space to crash....choose the narrow way!
tobydogs is online now  
  Reply With Quote
Old 01-20-2013, 06:59 AM   #16
TLyttle
Super Contributor
 
TLyttle's Avatar
 
Join Date: Nov 2005
Location: Keremeos BC Canada
Posts: 1,025
Thanked 51 Times in 49 Posts
iTrader: (0)
Friends: (4)
Default

A buddy flew an Aquila in competition, but he noticed that it tended to wander on high-speed runs (F3B), and we tried everything to cure it. Finally we sawed off those lovely upswept wingtips, and (1) it was faster and (2) the wandering disappeared completely and (3) it was more manoeverable at any speed. We even tried a few other tip shapes, nothing we tried improved the Aquila's performance. My guess is that the Reynolds Numbers were simply not high enough to make a difference.
TLyttle is offline  
  Reply With Quote
Reply

  WattFlyer RC Electric Flight Forums - Discuss radio control eflight > Electric R/C Airplanes > General Electric Discussions

« Previous Thread | Next Thread »

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
FMS / BlitzRC Cessna 182 (55-inch) wing span! guapoman2000 Scale E-Powered Aircraft 15 06-20-2014 10:57 AM
dihedral on low or mid wing paulatgis Scratch and Kit Built Aircraft 26 12-19-2012 01:25 AM
Parkzone Extra 300 Upside Down Wings *HORIZON LEAVES US IN THE COLD* jaskel Foamies 157 10-07-2012 03:48 PM
Super Cub & Wind Question vaflyer General Electric Discussions 17 04-14-2012 10:51 PM
Does anyone put the extra washout on their wing tips? GreenAce92 Aerodynamics 10 02-12-2012 09:49 PM


All times are GMT +1. The time now is 02:37 PM.


Powered by: vBulletin
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Copyright 2005 WattfFlyer.com
RCU Eflight HQ

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



Page generated in 0.66968 seconds with 53 queries