RC WINGLET Design - Flatten the upper surface

[Anonymous]

Hi to all,

I'm designing winglets for a prototype RC airplane.

I'm pretty Happy with my design, but I would like to avoid the upper face to get thinner close to the wing tip (loft effect going thinner from the airfoil root to the tip) ), in order to stay aligned with the upper face of the wing. (refer red line/arrows on the picture)

Thank you for your help !

https://autode.sk/2UTL7Qm

Manu

[TrippyLighting]

Can you share your design ? (exports as .f3d and attach  )

[Anonymous]

here it is

thank you for the help !

I'm just looking for having a smooth transition between wing and winglet.

Regards

[TrippyLighting · Accepted solution]

You created the loft from 2 profiles, one is a point and receives the "sharp" condition, the other is a sketch profile and will show "connected". You can change that to 'direction", but what you really would need is "tangency" with the surfaces of the wing.

In order to get that selection I am deleting the 1st (sketch) profile and reselect the end surface of the wing. That will allow to change the condition to "tangent (G1)".

The curvature on the wing profiles does not look too bad, but the rail profiles have too many spline points. Use fewer points to get better curvature and maybe even use CV splines.

[Beyondforce]

Hi @Anonymous ,

I just want to add to @TrippyLighting post, that I have just released a video on how to create a "Piper Cherokee 140", files are included: https://youtu.be/n1CAVO0nQuc

Cheers / Ben
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[Anonymous]

THANK YOU SO MUCHHHHHH "TrippyLighting"!!!!

It's just perfect, exactly what I was looking for !!!!

I have spent so many hours searching an answer, on forums, videos.... and you just made my day in a very short time !!!!

You should put this video on youtube, maybe it could help a lot of people !!!! what a difference making a loft from a surface instead of a sketch !!!

Thank you !!!

[Anonymous]

Hi Beyondforce !

Thank you for your video ! very useful as well !

Regarding the design of a wing (structure, ribs, aileron flaps spars wing tube....) I use the devcad's sofware family, like devwing cam... very easy but the problem is that it is not possible to export a dxf for laser cutting for free.... so I'm gonna lurn hacking software :), or give it a try with fusion 360....

So if you have some advises .... like how to equally cut the "lofted" wing to get ribs, or how to make the ribs lighter with "V" holes like the pictures attached without having to draw them one by one..., or anthing else...

Thank you

[Anonymous]

I have another problem.... As I want to 3d print this winglet, and then make a fiber mold of it, I need to built a "thin flat surface" on the middle of it to have a two peaces mold... don't know if you can understand me 🙂 for the rear it's is easy, in the patch module, i make an extrude of the rear guide line, but for the 3d outer line the extrude is build on the vertical axis, which I can't change nor rotate, so useless for me... any idea?

I would like to have this since surface at this angle, almost parallele with the middle axis of the winglet. like the red line with the red circle

[davebYYPCU]

Winglet Fence:

Extend the trailing edge, by the fence size, (new line)

Extend the datum line of the tip rib, (with new line)

In Patch, loft the two new lines, and use the winglet sketch curve as a centreline.

Thicken by the thickness of the fence.

Development Ribs:

I build from outside > in, 

make Skin, spars, LE, TE, plates and tubes, lightening holes as bodies, (but no ribs)

by using Extrude, Sweep or Loft, 

Create sketches where needed, use Project > Intersect > Bodies, and export to DXF

If you then Extrude the ribs, you can use the DXFer Addin to make one file with all the ribs.

Might help....

[Anonymous]

Thank you for those tips, Will try and let you know !