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Old Dec 02, 2009, 11:38 AM
Sink stinks
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Quote:
Originally Posted by KJMDES2 View Post
The only way I know to do an eliptical wing in SW is to cheat. I've been on SW since '98, and its not yet in my toolbag.

One way, if you are just messing around, is to add taper to an extruded root section. It means you can only use a root section, no tip.

Other than that, when I need to CNC an eliptical wing, I build it in SurfCam. SW is fine for most wing design, but eliptical has eluded me also. I would be intersted to hear about a method also.

Cheers,
Kevin
It's easy in Rhino. Draw the leading edge, trailing edge, and do a 2-rail sweep on the root airfoil and you're good to go.
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Old Dec 10, 2009, 10:11 PM
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Calgary, AB, Canada
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Quote:
Originally Posted by Montag DP View Post
It's easy in Rhino. Draw the leading edge, trailing edge, and do a 2-rail sweep on the root airfoil and you're good to go.
Somebody, somewhere said for the purposes of flying surfaces you actually want more airfoil sections stationed down the length of the planform & incorporated in the sweep. Otherwise this (2-rail) technique tends to distort the section airfoil outboard as its being influenced by the planform shape itself. (ie as opposed to using a single root). Fair enough. But its a very simple matter to use the scale & orient button-click commands to put as many sections as you like to attain tighter control. Or for that matter, smoothly blending different airfoil sections which serves aerodynamic purposes. Here are some 'eliptical-based' wing surface examples just for show. Note the one surface has smooth, upswung tips ala F5x wings.
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Old Dec 11, 2009, 04:15 PM
Sink stinks
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Originally Posted by ptxman View Post
Somebody, somewhere said for the purposes of flying surfaces you actually want more airfoil sections stationed down the length of the planform & incorporated in the sweep. Otherwise this (2-rail) technique tends to distort the section airfoil outboard as its being influenced by the planform shape itself.
I haven't checked it out in detail, but wouldn't the 2-rail sweep automatically scale the airfoil heightwise based on the distance between the two rails in order to maintain the same cross-section shape?
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Old Dec 11, 2009, 07:23 PM
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I think... the swept surface is influenced by the relative deviation of the rails. Without intermediate (rib) control, the fitted surface iso-contours may take on a different orientation.

In the orange surface I only used the root rib, see how the cross-chord iso-contours are drifting? In the green surface I included more 3d scaled rib stations in the same rail sweep. See how the cross chord iso-contours are now better lined up paralel to the normal chord direction. So the issue is with 'only root' you may not end up with the same section airfoil (meaning perpendicular to airstream) on the outboard panel, where it generally it counts more aerodynamically. When it comes to high perf stuff, this becomes an issue.

Once upon a time I did do a comparison by sectioning the root-only surface & it was indeed (very) slightly different. I guess 'how' different is a function of the particular airfoil + planform combination. As mentioned, its such a simple thing to place more control sections its not a big deal. Where it gets interesting is blends of different airfoils, sym>semi-sym varying camber, washout/twist etc. There you hav eno option but to place appropriate sections & loft through them.

Im not sure what to make of the zebra striping business, but I know funky tips always seem to create some weird results. Supposedly need even more control (rib stations) out there as the tip is deviating more. Maybe someone more 3d experienced can comment.

On rectangular or straight taper planforms, it doesnt matter I dont think. The single rib develops a proportional surface.
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Old Dec 23, 2009, 04:37 PM
Needs to do 52 legs !!
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Very interresting. Thanks for the heads up ptxman!

Oh and if any of you guy's do requests. I would like to see the following done in simple 3D to help design a plane around it;

Hyperion DS09 servo with one sided horn as seperate part
Neu 1512 series motor with gearbox

Optional;
Thunder Power 5S 3850mah and 6S 3300mah packs

Files need to be usable in Rhino.

Joe
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Old Dec 23, 2009, 05:38 PM
GLM
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Quote:
Originally Posted by jjmouris View Post
Very interresting. Thanks for the heads up ptxman!

Oh and if any of you guy's do requests. I would like to see the following done in simple 3D to help design a plane around it;

Hyperion DS09 servo with one sided horn as seperate part
Neu 1512 series motor with gearbox

Optional;
Thunder Power 5S 3850mah and 6S 3300mah packs

Files need to be usable in Rhino.

Joe
Here is 9 gram servo modeled on an HXT900 from HK. I hope it works for you. Not familiar with the Hyperion servo you mentioned.

Cheers!

Gary

Hang on - need to make zip file for you.
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Old Dec 23, 2009, 05:50 PM
Needs to do 52 legs !!
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The Hyperion is almost the same shape as the Dymond D60 or Ripmax SD150, both are only 9mm thick.
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Old Dec 23, 2009, 06:06 PM
GLM
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Oh,

3d scaled to 9mm thick (.354)

Cheers!

Gary
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Old Jan 12, 2010, 02:38 PM
Needs to do 52 legs !!
jjmouris's Avatar
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Ok, great to see this is now in it's own RC Groups section!!! Good stuff!!!

So how about a proper file of a Hyperion DS09 servo?!

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Old Jan 12, 2010, 02:42 PM
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Maryland, USA
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A very basic Dremel 200 in sketchup. It's not perfect, but the dimensions are right. I drew it for a cnc machine, I was drawing. -Kwok
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Old Jan 13, 2010, 12:38 AM
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Seattle
Joined Aug 2009
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There is a sketchup parts thread in the scratch built foamies section.
Free 3D! Sketchup Parts!

You can also find a number of parts in the Google 3D warehouse/ Try searching for aircraft to see a lot of models. Unfortunately, most of them weren't made with actual building in mind but worth a look.
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Old Apr 17, 2010, 10:51 AM
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France, Auvergne, Lapalisse
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TURNIGY motors
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Last edited by dpot; Jun 03, 2010 at 03:29 PM. Reason: mount for small motor
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Old May 08, 2010, 12:26 PM
Hix
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London UK
Joined Jan 2007
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Tower Pro 9g SG90 Servo 2d dxf 3D step and Iges

Tower Pro 9g SG90 Servo 2d dxf 3D step and Iges
Hope they're fo use to some of you.
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Old Jun 14, 2010, 03:29 PM
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USA, AZ, Chandler
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Quote:
Originally Posted by Smash View Post
Hi!

If Someone has an elliptical (not trapezoidal) wing model in SolidWorks please upload it!

I try to draw an elliptical wing since a week but I can't do it
I just discovered this forum, so forgive me if I'm just replowing old ground..

Attached is quick Spitfire-like wing with an elliptical leading and trailing edge using a NACA 2412 airfoil. Just a simple swept solid body...

I think the key to making this type of thing work is to insure that the swept profile is correctly constrained, i.e., it maintains its proportional shape throughout the sweep. For airfoils, defining the swept profile as a single proportional spline usually works pretty well.

The attached .pdf show SW screen captures of the basic model. If anyone is interested, I'd be glad to go over the process step by step...
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Old Jun 22, 2010, 07:21 AM
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To designers 1\2 A a necessary element - G-Mark 0.4cc modify.3dm - 1.85MB
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