The RC Geek Blog

By: Chris Wolfe

Dorsal Town

Final shaped dorsal test fit on fuselage

When you build an RC jet like this one, it’s nice to start off small.  Progress comes with small milestones accomplished by small steps at a time.  It really only takes a few hours per week to see notable progress and the key is to just get into the shop and make that progress happen.  Yes, it takes time and will take a while to get done, but that’s half the fun.  So, with that in mind, I started off construction with the dorsal.  Note that I started this build before starting this blog, so in some cases, I’m limited on the pictures that I took.

Sub leading edge glued in place

With everything unboxed and setup in my shop, the first item of business was sheeting the dorsal foam core (I plan to make a tutorial video on how to do this when I sheet the wings). Mark’s design incorporates a sub leading edge before sheeting, so that was installed first with some wood glue (I like to use Titebond Premium Wood Glue ).  The sheeting was made from contest grade 1/16” balsa (as light as possible) glued edge to edge as necessary to get full coverage over the core.  The grain of the wood runs parallel to the leading edge (important!) which helps with strength as well as makes it easier for the wood to contour over the foam core.  I used Pacer PT-40 Z-Poxy Finishing Resin to adhere the sheeting to the foam.  It was applied to the wood sheeting only (the foam will soak up resin if applied to it since it’s porous), in a light thin coat.  The sheeting was then placed onto the foam core and into the foam cradles.  The cradle was weighted so as to ensure a good bond and that the foam core remains straight.  To ensure it was straight, sight down the leading and trailing edges and place weights as necessary to straighten things out.  Once satisfied, it was left to cure overnight.


Sheeting done, LE and TE sanded to shape

Sheeting done, LE and TE sanded to shape


1/64

1/64″ ply ribbing on balsa cap


Tip block ready for planning and shaping

Tip block ready for planning and shaping

With the sheeting done, all edges were trimmed and block sanded flush to the foam.  From there, the balsa leading and trailing edge parts were glued on using wood glue and sanded to shape with a sanding block.  On the trailing edges, I like to laminate a 1/64″ ply strip between two pieces of balsa. When glued, the 1/64” ply is placed along the chord line so that once the TE is sanded to shape, it creates a fine, yet sturdy trailing edge.  The same was done for the tip block, but some ribs were added also to get a little space between the blocks.  The tip block was glued on following final shaping of LE and TE and subsequently shaped as well.  In checking my 3-view drawing, I noticed something didn’t quite look right on the supplied tip block, so I cut my own with a modified shape that was more representative of my 3-view reference.  Once all the shapes were final sanded, of course it requires a quick test fit on the fuselage!

Final shaped dorsal

I have to say, I love getting to this step of shaping the flying components of the airplane.  It’s fun to see it come together and form into what are the primary lifting surfaces for the model.  When I get to the wings, I plan to spend more time discussing how to sheet the cores, shape and sand the LE/TE and tips through videos and step by step tutorials.  Unfortunately, I had already built the dorsal before starting this blog and was limited on pictures for this post.  Next up as we build, we will tackle cutting, shaping and hinging the rudder.

The post How to Build an RC Jet – Part 3 appeared first on The RC Geek.

The RC Geek Blog is your place to learn about all aspects of the RC hobby. Learn to build, design, drive or fly that RC project you’ve always wanted to build, but have been intimidated to try. This blog is here to help you on your journey and provide tips and tricks as you go! My hope is to inspire builders both experienced and new! So, welcome, please look around, it’s an exciting beginning!  I’m currently documenting my latest competition scale RC jet build, a Mark Frankel F4D Skyray, along with some other fun tips and videos. If you can’t find what you’re looking for on this front page, click on any of the categories to the right and it will show just posts related to those categories. Please feel free to add comments and/or contact me directly if you have questions, I’m here to help! And don’t forget to check out my YouTube Channel, I post new videos every week!

Subscribe To Our Blog Now

By Chris Wolfe September 19, 2023
The B-58 Hustler Saga - From Triumph to Tragedy
By Chris Wolfe March 13, 2023
Preparing for Battle: The ULTIMATE Guide to Scale Documentation Maybe you've heard about RC Scale Aircraft competitions, but the thought it sounded intimidating, or the process of it all seemed daunting and discouraging. Well, fear not! I am here to encourage you and dispel any myths you may have heard if any. Scale competition is a fun and challenging segment of the hobby that will undoubtedly make you a better pilot! So, in light of this, I've started a new "Preparing for Battle" live series and in my first episode, "Preparing for Battle: The ULTIMATE Guide to Scale Documentation," we talk about the AMA Scale Nats with special guest Joe Vermilion from Balsa USA and peel back the layers of scale competition and provide information on what it's all about! As an experienced RC Scale Aircraft competitor and two time US Scale Masters National Champion, my hope is to share whatever knowledge and practical advice I can for newcomers and seasoned competitors alike.
By Chris Wolfe February 14, 2023
Are You Ready to Take Your RC Flying to the Next Level?? Then you’re in luck, because we’re giving away an FMS 1400mm F4U Corsair and an FMS 1100mm PC-21 ! But first, let's address the elephant in the room...it's been quite a while since my last blog post. With the move to TN and everything going on trying to get The RC Geek up and running full time, it's been difficult to sit down and set aside time to write. My goal is to change that going forward, so here's hoping! (check the vid below for even more details about everything mentioned here!)
By Chris Wolfe January 25, 2022
Flight of the Flir Cat…The Sequel!! I tell you what, it has been quite the journey getting here! As a project, this Freewing F-14 Tomcat refinish took much longer than I had originally planned based on all of the other distractions that have come through the shop, but I'm so happy with how this model turned out in the end. It did take a few flights to get tuned and I have made a few small modifications in the process since our last installment, but otherwise I'm happy to report that the Tomcat is flying quite well. The F-14 Tomcat has such a great look and presence in the air, you just can't beat it!
By Chris January 10, 2022
10 channels of power…and 1 receiver to rule them all! I personally love having the option for more channels, especially when building my own scale aircraft. While not always necessary, having channel options available is almost always helpful and it opens up opportunities to add scale functions and/or customize the controls more to your liking. And that's not to mention having individual servo setup across the same functions. So, I was excited to finally see the AR103060T and AR10100T 10 channel receivers released from Spektrum. It opens of channel options in a lighter weight package while also supports all of their new technology. Having been flying the NX10 for some time it is nice to finally be able to utilize all of those 10 radio channels.
By Chris January 10, 2022
Good times and Warbird Flying are back! Needless to say, the last year and a half plus has been hard on all of us. With so many of our normal routines and activities disrupted, it has only brought that many more challenges it seems. This hobby is not just about the airplanes and flying, it is about the friends and comradery that can be enjoyed together with others as well. So, when the Scale Squadron's Warbirds & Classics came up again this year after being cancelled in 2020, I was beyond excited to go; it had been almost 2 years since the last event I went to!
By Chris November 24, 2021
Refinish a Foam Jet Ep 4 – Freewing F-14 Tomcat Low-Viz Navy Weathering How low can you go?…a little low-viz Tomcat weathering. Finishing up the refinish work on the Freewing F-14 Tomcat, it’s time to apply some characteristic low-viz Navy weathering. The Flir Cat paint scheme is from the mid 90’s at a time when the Tomcats in service were painted primarily in Dark Ghost Grey (FS36320) with variations thereof. They were high maintenance workhorses at this time and the aircraft got extremely dirty during operation. This opens up lots of opportunities to apply different weathering techniques on the airplane to simulate those years of service on the carrier.
By Chris November 24, 2021
Refinish a Foam Jet Ep 3 – Freewing F-14 Tomcat Paint, Markings, & Panel Lines
By Chris September 27, 2021
Refinish A Foam Jet Ep 2 - Freewing F-14 Tomcat Cockpit 3D Printing, Painting and Moving Pilots
By Chris September 27, 2021
Fill…sand…poly…sand…primer…sand…aaaannnnddd repeat… You've probably figured out by now, I have many favorite aircraft. ;) However, if I was to put together my top 5 favorite aircraft of all time, the F-14 Tomcat would probably be at or near the top of that list. The airplane was one of brute force, but packaged in an elegant and distinct looking airframe that truly personified its name, Tomcat. And that's not to mention, it was an extremely capable fighter that filled many roles through the years that operated from the early/mid 70's into the mid 2000s.
More Posts
Share by: