Foam Kit Bashing 101 Ep 2 — The Mirage to Kfir Transformation

Birth of a “Lion Cub!”

Well, it’s been a little while since my tease at kit bashing a Freewing Mirage into an IAI Kfir (“Kfir” is Hebrew for “Lion Cub”).  We started with an assembly & flight review for the Freewing Mirage 2000 which out of the box flies awesome.  However, the Kfir is such an awesome looking airplane and with canards and a little extra wing area we’ll add in the bashing process, I can only imagine that the airplane will fly even better!  So, in this article, we’re covering the transformation process of turning this airplane into a Kfir and we’re using 3D printed parts as a part of that as well as employing some traditional building methods.  Through this whole process we will be employing the foam refinishing method I covered in our How to Refinish a Foam Warbird series.  I don’t plan to get into much detail about the foam prep work itself in this series as I want to focus on the kit bashing aspect to compliment the refinishing we did previously and use the next couple articles to go into more detail on painting, simple panel lines and weathering.

Now, one of the reasons that it’s been a little while is, in addition to of course a few distractions, is that I’ve been working out the 3D printed parts with a friend of mine.  CAD modeling takes time and there were a number of parts that we ended up making.  These include printing a new nose, the exhaust shroud and turkey feathers, the dorsal inlet, external wing tanks, lower ventral tank, and the afterburner cooling scoops and inlets on the fuselage.  As a whole, we printed a total of 23 individual pieces for the conversion (many of the parts required multiple pieces to be printed).

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Adventures in 3D Printing – Ep2

The Tale of Two Exhausts…

A while back, my Friend Brian had a minor incident with his 1/4 scale TBM P-40.  Though, it didn’t result in any physical damage to the airplane, it did result in an impact to the “stand way off scale” exhausts on one side.  Being made of thin plastic, they ended up crushed and unsalvageable.  We originally thought we’d make a quick plug and do some resin castings, but as we looked at the exhausts more, we realized just how out of scale they really were and how much they just didn’t look right at all.  So, enter the 3D printer!  Within a few days, we were able to draw and print some replacements that came out awesome!  Before we begin, if you’ve not read my Q&A on 3D printing, you can read that here to get a better understanding of the process and materials.  Also, if you’d like to see video of this P-40 in action I’ve embedded the video from my YouTube channel at the bottom of this article.  Don’t forget, if you are looking for help with some 3D printing, I can help!  Just shoot me an email through my contact form.

p40 exhaust printing-1

A comparison of the stock exhausts to the final 3D printed exhausts

The CAD Model

First things first, we had to make a CAD model of the exhausts.  In looking at the original plastic exhausts, they were completely out of scale.  We used the basic dimensions as a starting point, but then Continue reading

How to Build an RC Jet – Part 6

Finishing Fiberglass – Let’s finish that dorsal!

buld-an-rc-jet---skyray-52

Last time we finished up construction of our rudder/dorsal assemblies and built our offset rudder hinge.  So, now it’s time to clean these assemblies all up and make them as ready as they can be to be installed onto the fuselage.  The installation of the dorsal onto the fuselage will occur once all of the construction of the fuse is finished however.  The primary reason for this is so that all work on the fuselage can be done without the dorsal being in the way as the fuselage is rotated around while it’s worked on.

Primer – Sand…repeat, repeat, repeat…
With the dorsal and rudders being glassed (see Part 5 for that discussion), the first item of business is to start the Continue reading

Adventures in 3D Printing – Ep1

Wait, I can do what?!

3D printing is something that I have been playing with for some time and in one word, it is awesome!  Though as a technology, it has been around for a really long time, only within the last few years has it become an accessible tech for most folks.  The reason being that the prices of machines have come down dramatically allowing folks access to something that was otherwise cost prohibitive.  Also, there are commercial companies now that focus on 3D printing for non-industrial folks like us, plus one can now own a 3D printer for under $1000.    So, this is an exciting time as this awesome technology grows in popularity and becomes better and better!

JHH Mirage Turkey Feathers Comparison

Comparison of the 3D Printed turkey feathers on my JHH Mirage IIIRS to the full size.

As we are going through the Skyray build, 3D printing is something I’m using quite a bit for detailing.  I first started seriously experimenting with it on my mirage pushing it to the extent of fully printing the exhaust section turkey feathers.  So, with that in mind Continue reading