# Model airplane rudder modelling challange

**URL:** <https://discourse.shapr3d.com/t/model-airplane-rudder-modelling-challange/13648>\
**Category:** Modeling Questions\
**Created:** [July 4, 2021, 7:18am UTC](https://discourse.shapr3d.com/t/model-airplane-rudder-modelling-challange/13648 "2021-07-04T07:18:21Z")\
**Posts on this page:** 14\
**Page:** 1

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**Author:** ![Aptilla](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/aptilla/32/11106_2.png) [@Aptilla](https://discourse.shapr3d.com/u/Aptilla)\
**Post date:** [July 4, 2021, 7:18am UTC](https://discourse.shapr3d.com/t/model-airplane-rudder-modelling-challange/13648/1 "2021-07-04T07:18:21Z")

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For my current project I am working on the design of a model airplane (Wildfire) in the category control line F2B aerobatics with a wingspan of 1500 mm. A friend is building these type of airplanes for his hobby and flies them on tournaments. He asked me as sparring partner in order to design a model airplane that can be produced using a 3D-printer with PLA and LW-PLA filaments based on STL-files. Up to now these airplane models are made up of balsa wood.  
The pictures presented in this case are generated via eDrawings Viewer (SolidWorks) from an EASM-file exported from my 3D-CAD program (CoCreate Designer Modelling 2006 - direct modelling) running on a “vintage” HP Pavilion computer with Windows XP as OS.

Progress goes well continuing the design with my newly acquired iPad Pro version of Shapr3D. However there is one part that provides a modelling challenge that I like to present here. I would appreciate your advise on the matter.

The part concerned is the rudder which (for the moment) has a flat surface mating with the fuselage. The outer rim has a chamfer radius of 1.5 mm. The surface to the side of the fuselage is made up of two circular arcs. From the chamfered outer rim to the flat surface (at the fuselage) there is a continuous surface (on both sides). The max. width of the rudder is 12 mm, the height 190 mm en the length 72 mm.

Best regards, François M.J. Adang  
(retired 2015) mechanical engineer

 ![Wildfire-08 Rudder](https://us1.discourse-cdn.com/flex002/uploads/shapr3d/original/2X/8/8f46f83bf261d95a86df7baf00a1e5b74cca4654.jpeg)

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**Author:** ![JST](https://avatars.discourse-cdn.com/v4/letter/j/edb3f5/32.png) [@JST](https://discourse.shapr3d.com/u/JST)\
**Post date:** [July 4, 2021, 12:13pm UTC](https://discourse.shapr3d.com/t/model-airplane-rudder-modelling-challange/13648/2 "2021-07-04T12:13:28Z")

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If you need constans chamfered 3mm trailing edge I think surface tool is neccesary, it’s not available now.

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**Author:** ![Robert](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/robert/32/1329_2.png) [@Robert](https://discourse.shapr3d.com/u/Robert)\
**Post date:** [July 4, 2021, 6:39pm UTC](https://discourse.shapr3d.com/t/model-airplane-rudder-modelling-challange/13648/3 "2021-07-04T18:39:41Z")

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[rudder.shapr](https://discourse.shapr3d.com/uploads/short-url/bvEqBgWon0nWMSWP1M6QhSVfg4h.shapr) (2.0 MB)

Does this work for you?

//R

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**Author:** ![TigerMike](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/tigermike/32/32650_2.png) [@TigerMike](https://discourse.shapr3d.com/u/TigerMike)\
**Post date:** [July 4, 2021, 6:55pm UTC](https://discourse.shapr3d.com/t/model-airplane-rudder-modelling-challange/13648/4 "2021-07-04T18:55:01Z")

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Nice job Robert.  
Can I assume you first did a **Loft**. Then **Extruded** the profile in both directions from center. Then did an **Intersection**. Am I right?

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**Author:** ![Robert](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/robert/32/1329_2.png) [@Robert](https://discourse.shapr3d.com/u/Robert)\
**Post date:** [July 4, 2021, 7:13pm UTC](https://discourse.shapr3d.com/t/model-airplane-rudder-modelling-challange/13648/5 "2021-07-04T19:13:26Z")

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Hi Mike,

You are absolutely right 👍🏻

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**Author:** ![Aptilla](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/aptilla/32/11106_2.png) [@Aptilla](https://discourse.shapr3d.com/u/Aptilla)\
**Post date:** [July 4, 2021, 8:18pm UTC](https://discourse.shapr3d.com/t/model-airplane-rudder-modelling-challange/13648/6 "2021-07-04T20:18:24Z")

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Thanks Robert. I briefly looked at your model on my iPad. I will study the result some more.

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**Author:** ![Ali3d](https://avatars.discourse-cdn.com/v4/letter/a/7ba0ec/32.png) [@Ali3d](https://discourse.shapr3d.com/u/Ali3d)\
**Post date:** [July 4, 2021, 8:56pm UTC](https://discourse.shapr3d.com/t/model-airplane-rudder-modelling-challange/13648/7 "2021-07-04T20:56:50Z")

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Thank you this helped me as I do aircraft pars as well, but static scale model parts for plastic kits

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**Author:** ![JST](https://avatars.discourse-cdn.com/v4/letter/j/edb3f5/32.png) [@JST](https://discourse.shapr3d.com/u/JST)\
**Post date:** [July 4, 2021, 9:38pm UTC](https://discourse.shapr3d.com/t/model-airplane-rudder-modelling-challange/13648/8 "2021-07-04T21:38:16Z")

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Can you show the steps? Pls!🙏

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**Author:** ![Robert](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/robert/32/1329_2.png) [@Robert](https://discourse.shapr3d.com/u/Robert)\
**Post date:** [July 5, 2021, 6:05am UTC](https://discourse.shapr3d.com/t/model-airplane-rudder-modelling-challange/13648/9 "2021-07-05T06:05:07Z")

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![image](https://us1.discourse-cdn.com/flex002/uploads/shapr3d/original/2X/d/dd570addcbf4163ba92f2f12b59ed63b7c5f5850.jpeg)  
 ![image](https://us1.discourse-cdn.com/flex002/uploads/shapr3d/original/2X/f/f5b94b1356294453bbdba3ba13f9eadecfe7ce63.jpeg)  
 ![image](https://us1.discourse-cdn.com/flex002/uploads/shapr3d/original/2X/3/32c5bdb628a28c6e18195f3ba0b6fbf07642a470.jpeg)  
 ![image](https://us1.discourse-cdn.com/flex002/uploads/shapr3d/original/2X/8/89362c24e1ae6112e2196decf22242f98dd56312.jpeg)  
 ![image](https://us1.discourse-cdn.com/flex002/uploads/shapr3d/original/2X/3/3b5f318cf8b3a2b60b11b398b859cbcb3929a5ce.jpeg)  
 ![image](https://us1.discourse-cdn.com/flex002/uploads/shapr3d/original/2X/4/4f6e32e200aef42e808920057f9ccbfda1d8061f.jpeg)  
 ![image](https://us1.discourse-cdn.com/flex002/uploads/shapr3d/original/2X/1/1d62bd0580e8133b2a00aa69d1bc658bd07236d3.jpeg)

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**Author:** ![Aptilla](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/aptilla/32/11106_2.png) [@Aptilla](https://discourse.shapr3d.com/u/Aptilla)\
**Post date:** [July 5, 2021, 6:42am UTC](https://discourse.shapr3d.com/t/model-airplane-rudder-modelling-challange/13648/10 "2021-07-05T06:42:59Z")

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Thanks Robert for the stepwise explanation. I studied your sketch planes earlier.  
The picture is generated via eDrawings Viewer from the STP-file export form Shapr3D.  
I completed recreation of the model sunday evening.

 ![Padfire Mk 01 v08](https://us1.discourse-cdn.com/flex002/uploads/shapr3d/original/2X/2/266d7c3fc4b5d97974a121da8c2052eb6ad16c38.jpeg)

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<div class="post-metadata">

**Author:** ![Robert](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/robert/32/1329_2.png) [@Robert](https://discourse.shapr3d.com/u/Robert)\
**Post date:** [July 5, 2021, 6:45am UTC](https://discourse.shapr3d.com/t/model-airplane-rudder-modelling-challange/13648/11 "2021-07-05T06:45:34Z")

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Hi Mike,  
I stumbled upon another way to do it also, here you do not need the Intersection part

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**Author:** ![Robert](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/robert/32/1329_2.png) [@Robert](https://discourse.shapr3d.com/u/Robert)\
**Post date:** [July 5, 2021, 6:46am UTC](https://discourse.shapr3d.com/t/model-airplane-rudder-modelling-challange/13648/12 "2021-07-05T06:46:30Z")

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Nice 🙂🙂

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**Author:** ![TigerMike](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/tigermike/32/32650_2.png) [@TigerMike](https://discourse.shapr3d.com/u/TigerMike)\
**Post date:** [July 5, 2021, 3:25pm UTC](https://discourse.shapr3d.com/t/model-airplane-rudder-modelling-challange/13648/13 "2021-07-05T15:25:39Z")

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Well done Robert. A really nice elegant method!

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**Author:** ![JST](https://avatars.discourse-cdn.com/v4/letter/j/edb3f5/32.png) [@JST](https://discourse.shapr3d.com/u/JST)\
**Post date:** [July 6, 2021, 5:35am UTC](https://discourse.shapr3d.com/t/model-airplane-rudder-modelling-challange/13648/14 "2021-07-06T05:35:28Z")

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Many thanks Robert!  
This solution may be good in another project for me, as a workaround.