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May 16, 2020, 02:30 PM
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robertus's Avatar
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Build Log

MiG-21 EDF 70mm - Step by step with plans


Hello folks,
Allow me to announce my new project the MiG-21 powered by EDF 70mm on 4S.
It will be a little different than other. I'm going to share with you how I develop the project from drawings to the maiden flight. Step by step.

So let's start

MiG21 Scratch build - part1 (4 min 28 sec)


Unfortunately Windows recording doesn't shows context menu.

Edit: I forgot to mention. This is Sketchup.

Edit2: Plans are in #79
However, I recommend that you familiarise yourself with all pages earlier for better understanding the plans.
Last edited by robertus; Jul 01, 2020 at 02:11 PM.
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May 16, 2020, 03:26 PM
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Part 2
As you can see I always design only half of a plane

MiG-21 Scratch build part2 (4 min 49 sec)
May 16, 2020, 03:31 PM
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Part 3
Usually I upscale the wings and tail area by around 15% for more lift and stability.
Will see If it's not too much.
MiG-21 Scratch build part3 (2 min 43 sec)
May 16, 2020, 03:34 PM
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Part 4
1. Cleaning,
2. grouping
3. redrawing
Repeat until be ok.
MiG-21 Scratch build part4 (6 min 42 sec)
Last edited by robertus; May 16, 2020 at 03:46 PM.
May 16, 2020, 06:22 PM
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What software are you using to create this with?


John Boren
May 17, 2020, 02:10 AM
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Quote:
Originally Posted by John Boren
What software are you using to create this with?


John Boren
Hi John, this is Google Sketchup.
May 17, 2020, 02:18 AM
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Part 5
Still cleaning and redrawing some lines. At the moment I'm thinking how to divide model to the modules. Grouping helps in that.
MiG-21 Scratch build part5 (12 min 11 sec)
May 17, 2020, 02:39 AM
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Part 6
Detailing, nose cone.
Preparing modules. As you can see fuselage is divided to upper and lover module, for easiness of building.

MiG-21 Scratch build part6 (5 min 10 sec)


I'm not going to build a scale intake. I'll make cheat holes like in Freewing MiG-21, but from other hand I want to do some duct from nose cone for cooling the electronics.
May 17, 2020, 02:47 AM
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Part 7
Last corrections in the model and adding duct for EDF.
And at the end make a second half of MiG
Model in Sketchup is finished

MiG-21 Scratch build part7 (9 min 8 sec)
May 17, 2020, 02:50 AM
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Part 8
Now, It is time for unfolding surfaces. I'm using Unfold plugin for Sketchup for it.
First two modules: Wings/Tail and upper fuselage module.

MiG-21 Scratch build part8 (8 min 59 sec)
May 17, 2020, 03:19 AM
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I had to paste all parts quickly, because I'm in step 8 at the moment.
Now we are in the same time point in the build.

So, now I have plans for printing. Form Sketchup plans I can export to pdf. It is crucial to set camera to parallel and top view before export. Next I print pdf in adobe acrobat reader as a poster with cut markings. 100% scale of course. The 50mm square confirms that print is in scale.
May 18, 2020, 03:44 PM
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fantastic job so far! love the MiG-21.
-beanie
May 20, 2020, 02:54 PM
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Small progress
May 20, 2020, 07:57 PM
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really interested in seeing how you make yours EDF. i designed mine a long time ago using very similar techniques that you have used so far. but mine is a pusher, but i'd love to convert her to a 70mm EDF.
-beanie
May 21, 2020, 05:02 AM
Registered User
Really nice, always wondered how jets are designed from the blueprints, thanks for documenting this, looking forward to your build, i would love to build this mig 21 someday, cheers


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