New Products Flash Sale
Thread Tools
Old Nov 25, 2009, 11:37 AM
thurps is offline
Find More Posts by thurps
Registered User
thurps's Avatar
Question

Rounding wing tips


Building a Fat Albert. I have been looking at several plank build threads and have noticed quite a variation in the shape of the wing tips. Is there any real advantage to rounding the wing tips? If so, how much or what shape.

Thanks, K.
Sign up now
to remove ads between posts
Old Nov 25, 2009, 12:27 PM
TomFlyer is offline
Find More Posts by TomFlyer
Registered User
A lot less drag. It is probably more critical on a wing because of the inhearent stability issues that wings have. maybe try detatachable wing tips and see how that changes things.
Old Nov 25, 2009, 03:24 PM
steve wenban is offline
Find More Posts by steve wenban
Crikey never leave beer behind
steve wenban's Avatar
Another good reason a round tip is a lot less susceptible to damage on landing square edges tend to be a weak point and suffer badly when impact occurs.
SteveW IMHO
Old Nov 25, 2009, 05:48 PM
Hexosex is offline
Find More Posts by Hexosex
Registered User
Hexosex's Avatar
Quote:
Originally Posted by steve wenban View Post
Another good reason a round tip is a lot less susceptible to damage on landing square edges tend to be a weak point and suffer badly when impact occurs.
SteveW IMHO
I second both as its going to be more efficent as the vortex's (= drag) wont be so bad on the tips at high speeds.
Old Nov 25, 2009, 07:07 PM
MATIN is online now
Find More Posts by MATIN
Just Toss It !!!
MATIN's Avatar
Quote:
Originally Posted by Hexosex View Post
..... its going to be more efficent as the vortex's (= drag) wont be so bad on the tips at high speeds.
Not quite sure about that......The Mooney 201, one of the fastest GA planes, has square wingtips.

Matin
will throw in grenade once in a while.....
Old Nov 25, 2009, 07:11 PM
steve wenban is offline
Find More Posts by steve wenban
Crikey never leave beer behind
steve wenban's Avatar
Yeah but its a got steaming great metal whizz bang noise maker suck in its nose.
SteveW
Old Nov 25, 2009, 07:16 PM
MATIN is online now
Find More Posts by MATIN
Just Toss It !!!
MATIN's Avatar
Drag is drag!.......The noisy people hate it as much as the silent types...

Matin
Old Nov 25, 2009, 07:22 PM
steve wenban is offline
Find More Posts by steve wenban
Crikey never leave beer behind
steve wenban's Avatar
Drag to thrust ratio is alot easier to handle than drag over sink it's called a throttle
SteveW ex fixed wing power flyer (full size)
Old Nov 25, 2009, 07:32 PM
MATIN is online now
Find More Posts by MATIN
Just Toss It !!!
MATIN's Avatar
You mean to tell me the Mooney designer could squeeze out a few knots out of the 201 with a mere rounding of the tips and didn't.......That moron!!!

Matin
Old Nov 25, 2009, 08:07 PM
steve wenban is offline
Find More Posts by steve wenban
Crikey never leave beer behind
steve wenban's Avatar
No I was not saying that in any way, some thing else about the 201 it tended to porpoise at cruise . Also there's a huge aerodynamic difference between a full size powered aircrafts wing and a lump of foam thats measured with a vernier marked with a thick black marker pen and cut with an axe
SteveW
P.S I'm sure that modifications could be made to the 201 to improve its O/all performance the same can be said of any aircraft or car for that matter.
Old Nov 25, 2009, 08:19 PM
thurps is offline
Find More Posts by thurps
Registered User
thurps's Avatar
How about chopping off the end at a 45 deg. with an ax?
Old Nov 25, 2009, 08:25 PM
steve wenban is offline
Find More Posts by steve wenban
Crikey never leave beer behind
steve wenban's Avatar
that works to
Old Nov 25, 2009, 08:30 PM
JGAF is offline
Find More Posts by JGAF
Aerobatics!
JGAF's Avatar
Quote:
Originally Posted by thurps View Post
How about chopping off the end at a 45 deg. with an ax?
You have to get video though.
Old Nov 25, 2009, 08:44 PM
MATIN is online now
Find More Posts by MATIN
Just Toss It !!!
MATIN's Avatar
Quote:
Originally Posted by steve wenban View Post
No I was not saying that in any way, some thing else about the 201 it tended to porpoise at cruise . Also there's a huge aerodynamic difference between a full size powered aircrafts wing and a lump of foam thats measured with a vernier marked with a thick black marker pen and cut with an axe
SteveW
P.S I'm sure that modifications could be made to the 201 to improve its O/all performance the same can be said of any aircraft or car for that matter.
I understand......But would changing the wingtips of the 201 reduce the drag??!!!!

Not trying to be a pest here.......I just want somebody to show me some data.

For years I've been asked the same question about wingtips. After talking to people a lot smarter than myself I didn't learn a whole lot.
Mind you, I've never had or built a glider with square tips. My gut instinct tells me thinned and rounded tips are better.

If someone out there has the data please point me in the direction.
And I beg you.....stick with the low R numbers please!

Matin
remembers the porpoising but didn't mind it......it keeps the pilot awake!
Old Nov 25, 2009, 09:35 PM
steve wenban is offline
Find More Posts by steve wenban
Crikey never leave beer behind
steve wenban's Avatar
personally I dont think rounding the tips has any significant effect on planks or Chevron wings other than reducing damage I believe that the L/edge shape as a whole has much more to do with increased, decreased performance . It has been noticed that if the leading edge is left slight fatish at the tip on a chervon wing that the old death sprial seem to be greatly decreased , but thats only by exprience not by documented data or wind tunnel tests. I think the best we can hope for is a compromise when it come to foam planks and chevrons build it clean build it true and throw it off a mountian as for improving the performance of the 201 rather than decreasing the wing area by rounding the tips it would probably be better to add wingtip fence or a small winglet just a thought.
SteveW


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Discussion Wing Dragon/Wing Dragon 4/Begin-Air Series Planes Tips & Tricks Sir Raleigh Parkflyers 1318 Nov 08, 2016 10:20 PM
Discussion supra wing tips with no spars fishdude Composites Fabrication 0 Sep 12, 2009 12:40 PM
Discussion Tiger moth wing tips Dervall The Builders Workshop 20 Sep 11, 2009 06:50 PM
Discussion Any tips for my first flight with a low wing plane? Warthog_Fan Fuel Plane Talk 4 Sep 06, 2009 08:53 AM
New 24in flying wing need tips ideas and post pics or your wing here sylair Foamies (Kits) 37 Aug 17, 2003 07:05 PM