Creating Sketch plane on curved surface

charles_wood517 · September 2016

hey everyone.
I'm trying to build a V-shaped aircraft tail part for a glider I'm working on.

You can see here:

I have the basic tube extension modelled:
https://cad.onshape.com/documents/916f1fc74719787d4d162627/w/b3aea26d2ea1aa3520f58285/e/3e6a0bc6f9638cb65c43fdbb

But I'm having trouble figuring out how I make two sketch planes that are 35 degrees off the horizon, but at the intersection of the surface of the rounded (revolved) pylon where two v-tail extrusions will exit the pylon to attach to foam ruddervators.

Any ideas? My Google Fu has run out.

joe_dunne · September 2016

Try this:

https://cad.onshape.com/documents/0de04acb5bac92ca16796edf/w/cdd1d1882311084fe54bff24/e/680f0565e919e6e39a06f4df

it handles a whole bunch of new plane creation methods

Image: https://us.v-cdn.net/5022071/uploads/editor/cc/gtsxtvgp4wl7.jpg

mahir · September 2016

There are multiple ways to do this, including at least one custom FeatureScript I know is floating around there, but here's the simplest way I cant think of for your particular application. It involves creating a line normal to the surface and at the required angle from horizontal. That line and its end point are then used as the point and normal for creating a plane feature. Although, in your case you could just create a plane rotated around the center axis of your tube. The fins can then be generated from that plane.

https://cad.onshape.com/documents/57acdfaae4b005c413ed9b6f/w/3fd585a46d3af1b3ba413c53/e/900941813cb19e709ef9c759

joe_dunne · September 2016

Try this:

https://cad.onshape.com/documents/0de04acb5bac92ca16796edf/w/cdd1d1882311084fe54bff24/e/680f0565e919e6e39a06f4df

it handles a whole bunch of new plane creation methods

Creating Sketch plane on curved surface

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