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  #1  
Old 02-07-2011, 11:54 AM
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mldixon mldixon is offline
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Bristol T188

The Bristol T.188
This is a plane that came to my attention just recently and so I set aside my other projects and jumped into this one feet first. It is a very interesting plane and I will attempt to document my design as I go along. So here we go.
First here is the link to the plane itself to give you some background.



http://en.wikipedia.org/wiki/Bristol_188
I use Sketchup to design with so I started off with an image of the wings top and bottom from a three view set of drawings.



From here I import this image into Sketchup and then scale it so that it is the proper size. I use ScaleCalc to take the actual dimensions of the plane from the web information and then set it to 1:32 which is what size this model is going to be built.
So



1. Get image to work with
2. Import into Sketchup as Image
3. Use measure tool to determine a know distance in image
4. Scale this distance with the scale tool to dimension of final size as determined by Scale Calc



5.Now you have the starting point. So put this on a separate layer and name it image




6.Make image transparent so that you can see the lines that you are about to draw on it



7. Zoom in and draw single lines for cross sections of engine nacelle



8. Hide image so you can work with the lines you have just drawn





9. Now rotate the image so you can see the lines in perspective




10. Use circle tool to snap to midpoint of line and drag circle to outside of line. Segment count is important when you are drawing in details as this will give you the right number of divisions when you unfold it in Pepkura and export the dxf file for adding details .







11. Now erase lines from circles to arrive at formers of Nacell



12. Now establish center points for each circle and make them each a individual group



13. You now have all formers made and grouped in the proper place for lofting the lines.



14. Starting with one end highlight the group by touching the circles perimeter and then move to the next one



15. You will notice that it numbers them one than two. This is going to make your first skin section



16. Hit the green checkmark and your skin is applied former to former



17. Change the segment to one. This is important step when you go to unfold this in Pepekura. Mutiple segements look nice, but they cause a lot of problems in the unfold



19. Hit the green check again to complete the skin and it will make itself a group and finish



20. Now you have a Engine Nacell completed



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  #2  
Old 02-07-2011, 12:18 PM
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mldixon mldixon is offline
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Part 2

20. Choose the paint bucket and color the parts as you see fit



21. Now unhide the image and check your work



22. Hide groups behind your working area so you don’t get confused with multiple objects. Highlight the front group with the concial cone and draw a line straight forward on the image



23. You now make the lines to establish the plane of the cone itself the use the follow me tool to rotate the plane using the circles perimeter to act as the path







24. Now unhide the other groups



25. Highlight all the groups and export the 3d model for Pepkura



26. Choose a folder and make sure you open options windows and set current selection and other items to suit your need




When completed you will get a success window


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Old 02-07-2011, 12:33 PM
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mldixon mldixon is offline
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Pepekura Unfolding

1. Open Pepakura and open the 3ds model file or whatever extension you chose to export



2. And you now have the 3d model for the unfolding




3. I now establish my opening edges for the unfolding of the model . Keep this in line on one edge along the bottom of the nacelle





4. I unfold manual and you have to do the math here to make sure you are at the right scale



5. Unfolded Nacell with formers ready to print cut and build your white model for check of shape etc.



I did not cover the texture of the model here. I will do that later. I just thought this primer on getting a design out for a unfold in Pepkura might help some of you who have dipped your toes into Sketchup.

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Old 02-07-2011, 01:22 PM
rmks2000 rmks2000 is offline
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Thanks for this. Always love to follow a design tutorial. Great topic too - never heard of this plane before.
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Old 02-07-2011, 01:33 PM
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mldixon mldixon is offline
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Quote:
Originally Posted by rmks2000 View Post
Thanks for this. Always love to follow a design tutorial. Great topic too - never heard of this plane before.
Glad you like it, I was afraid I would put everyone to sleep.
I never heard of this plane before either, but apparently the Brits were '
hard at work in 1953 developing what appears to be a SR 71 type of plane
that was for Mach 2 testing.
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Old 02-07-2011, 01:49 PM
Zathros Zathros is offline
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Wow, First, never heard of that plane before, Thanks, 2nd, very good tutorial on Sketchup! Maybe I can even figure out how to turn it on now!! I am O.K. with Rhino, but Sketchup and Pepakura, nope. Very interesting thread.
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Old 02-07-2011, 02:22 PM
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Leif Ohlsson Leif Ohlsson is offline
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I appreciate this tutorial as well. Would it be alright to unfold the model with e.g. Flattery?

And do you have a list of recommended plug-ins one ought to get?

Leif
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Old 02-07-2011, 02:25 PM
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mldixon mldixon is offline
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Modeling the Engine in Paper or was that Foil?

So I did a little more work on the Sketchup Model



Just making sure it all worked together Then I proceeded to cut the formers Then the Sections






But this plane was all Stainless Steel. So I decided to work in foil just to see how impossible this could get. Front Half , Back Half, and Induction Flaps


Back side of Induction flaps with cuts showing Assembled Induction flap ring
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Last edited by mldixon; 02-07-2011 at 02:57 PM. Reason: Fix photo
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Old 02-07-2011, 02:41 PM
Zathros Zathros is offline
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Attachments not working.
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  #10  
Old 02-07-2011, 02:59 PM
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mldixon mldixon is offline
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Quote:
Originally Posted by Zathros View Post
Attachments not working.
Could you tell me which attachments you are referring to?
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