Lumenier RB2205C-12 2400KV SKITZO Ceramic Bearing Motor
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Old Oct 06, 2012, 08:59 AM
derpron is offline
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darn you, kakka carrot cake.
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disadvantages of having a flat wing?


i know that having a wing that has more thickness on the front and less at the back creates more lift but what happens if i just made a flat foam board wing?
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Old Oct 06, 2012, 09:11 AM
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“There’s no place like Foam”
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Flat wings work a treat ... no worries !!!
Old Oct 06, 2012, 09:18 AM
Dave Barrow is offline
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You can enhance your flat wing using Kfm
https://www.rcgroups.com/forums/show....php?t=1296458
Old Oct 06, 2012, 09:46 AM
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darn you, kakka carrot cake.
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Originally Posted by gpw View Post
Flat wings work a treat ... no worries !!!
are you sure? my dad said that i have to have a curvature and thickness at the front of the wing to create more lift but all of my scratchies have flat wings. could you tell me the disadvantages of it?
Old Oct 06, 2012, 09:59 AM
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Snipe the Skies!
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The only disadvantage is that you will not get lift from your wings. Instead a flat wing will cut through the air and ride on it but not actually get any altitude from having a negative air pressure on the top of the wing. In fact flat wings have some of their own advantages for small aircraft such as rc planes. Flat wings are easiest to build, are lightweight, and when built true and straight are not prone to ballooning or having poor flight qualities due to improper angle of attack. The downsides are that generally a true airfoil can fly slower, and a built up wing is generally stronger.
Old Oct 06, 2012, 10:02 AM
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Build straight - Fly twisty
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You asked gpw if he is sure?
Gee! He's only built about 57,000,000 planes. I think he's sure
This is how a flat-winger can fly.
IITOP 2012 F3P-AM Donatas Pauzuolis (2 min 0 sec)
Last edited by Whiskers; Oct 06, 2012 at 10:08 AM.
Old Oct 06, 2012, 10:20 AM
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Crashmaster
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Originally Posted by Whiskers View Post
You asked gpw if he is sure?
Gee! He's only built about 57,000,000 planes. I think he's sure
This is how a flat-winger can fly.
http://www.youtube.com/watch?v=-zh5COVVwVA
Pretty badass video.....makes me wanna learn 3-D!! Baby steps, though....baby steps.
Old Oct 06, 2012, 10:27 AM
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Try it!Many plans call for just a flat wing.Or you can do an experiment,make a simple plane where you can change wings,then try and fly them in the same enviroment and see which you like.THe c.g may change with each wing,so do glide tests prior and adjust battery.
Old Oct 06, 2012, 10:48 AM
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Wasn’t Totally sure , but after seeing that Video, I’m convinced ... Thanks Whiskers , that IS some IMPRESSIVE flying .... :drool: !!!
Old Oct 06, 2012, 11:09 AM
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I fly like that all the time......then I wake up!That was great if he had a breeze he could have flown backwards too
Old Oct 06, 2012, 11:13 AM
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darn you, kakka carrot cake.
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Quote:
Originally Posted by Whiskers View Post
You asked gpw if he is sure?
Gee! He's only built about 57,000,000 planes. I think he's sure
This is how a flat-winger can fly.
http://www.youtube.com/watch?v=-zh5COVVwVA
yeah but the thing is with 3D planes, they are basically helicopters that can glide a little. and iv build a meter long combat plane that's powered by a little blue wonder.
Old Oct 06, 2012, 11:19 AM
balsa or carbon is offline
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Hot glue held together by foam
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Flying backwards


Quote:
Originally Posted by maurice076 View Post
I fly like that all the time......then I wake up!That was great if he had a breeze he could have flown backwards too
4D rc indoor electric plane (2 min 44 sec)
Old Oct 06, 2012, 11:26 AM
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O.k. you lost me on that one.Reversable motor?Or just trickery?
Old Oct 06, 2012, 11:30 AM
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“There’s no place like Foam”
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Likely a reversible prop ... Cool eh ???
Old Oct 06, 2012, 11:36 AM
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I don't want to "Switch Now"
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Quote:
Originally Posted by snipeworm View Post
The only disadvantage is that you will not get lift from your wings. Instead a flat wing will cut through the air and ride on it but not actually get any altitude from having a negative air pressure on the top of the wing.
Sorry, but this is incorrect.

A flat plate wing is just like any symmetrical wing and can generate lift. The mechanism for lift generation is the same for all airfoil sections. Call it flow turning or bound vortex or whatever you want but the end result is the same.
Higher velocity flow on top relative to the bottom, hence lower pressure on top than on the bottom.

The only difference is that it can't generate as much lift, and will make more drag doing it.

Good little applet here that lets you play around with sections, including flat plates, and see the effect on lift and drag:

http://www.grc.nasa.gov/WWW/k-12/airplane/foil3.html

Flat plates work fine when the model is lightly loaded, drag is not an issue, and/or you want to spend a lot of time post-stall anyway. Pretty much defines 3D flight.

Pat MacKenzie
RCG Plus Member


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