Tag Archive: assembly


Hello,

I am working on an exciting project. I am converting my Turnigy 9X radio to FrSky. In my other post I wrote about what parts were needed to do the conversion. Now I am trying to give a short summary of how I managed with the actual work.

As it turned out the DIY kit of FrSky is somewhat different of the one that RC Model Review tutorial uses. He used the old module, that was available by that time he made his review. The new kit has a switch for telemetry mode and firmware update.

FrSky DIY kit switch

I had to find some space for that switch. I drilled a hole on the back of radio under the metal support.

3-way switch (telemetry and firmware update)

3-way switch (telemetry and firmware update)

I faced some complication when I wanted to use my epoxy glue to fix the small circuit board with the bind switch and status light. The epoxy got wrong it the bottle, I had to discard it. Placed an order on new epoxy from local hobby shop but it will arrive only in a couple of days.

I followed the instructions when I installed the small programming board from Smartieparts. Rather easy to do. The small board that has USB connection has perfect fit in the radio back, in the battery compartment. Just slides into a cavity without glitch. This board enables even backlighting of screen, I haven’t ordered that though. So far I haven’t felt the need for lit screen.

Smartieparts USB connector 9X board Smartieparts 9X board Smartieparts board in place

Another important part was the battery upgrade. I left the original connector in the radio and cut the wire to the AA-battery compartment. Then I soldered on a servo connector to be able to use the matching connector on the Li-Fe battery pack. I not only double-checked but triple-checked the polarity. Did not want to perform inverse polarity failure.

Polarity!!!

Polarity!!!

Double heat shrink Ready to connect

I had the most trouble with the radio antenna. In the original review from RC Model Reviews that old FrSky module does not have a small washer on the antenna sleeve. The new one has. It is there for having a better mechanical connection. However it was more difficult to push through the plastic feature of my radio. I think the reason is that my radio was already modified once by its previous owner, so some of it parts were already altered. It should work most probably fine on a brand new unit. After some gentle violence I managed to get the antenna in place.

When I made the holes on the top of the radio to be able to get access to binding switch and status light I did not use any template. I just drilled one hole, put the small unit there and marked the next hole by eyeballing it. Then drilled it. And it went all right. I did not use a battery drilling machine, I only have a big machine, so was rather careful not to drill too deep into the radio. Went OK.

I received my glue so I can finalize the position of binding switch. I need to do the most tricky part of the build, the actual soldering of the DIY kit connections. When that is ready I can proceed as RC Model Reviews shows in his tutorial and build together the radio.

Soldered and added heat shrink to protect leads

Soldered and added heat shrink to protect leads

Used velcro to secure module

Used velcro to secure module

Velcro to secure module

Velcro to secure module

Module in the middle to not block metal contacts.

Module in the middle to not block metal contacts.

Bind switch "spacers"

Bind switch “spacers”

Bind switch spacer glued into housing.

Bind switch spacer glued into housing.

When all the building part is ready on the transmitter I need to refresh the software to er9X firmware as well. That will be a major leap for the radio software interface. Then I also need to change the radio receiver to FrSky on my Easystar plane. A lot of work is left actually.

As for today I checked if the radio can be turned on. It works, I did not make any fatal mistake yet. Good news, I was afraid that the “magical smoke” might get out of the radio… 🙂

With best regards,

Sir Crash a Lot

Hello!

I would like to start with an announcement: after long preparations I started with the build. Or should I say “The Build!” maybe 🙂

First I glued in the motor:

Then I glued in cockpit clip bracket.

Then I extended the rudder. Bigger size, Du-Bro hinges and clearance for the elevator. Made of 2 mm plywood, “carved out” with a screwdriver and a hammer. Yes, I worked like a caveman, really sophisticated way 🙂

Notice that the rudder is not glued in place, the hinges are test mounted on picture.

Glued the tail, was very careful to have 90 degrees angle between stabilizers. I want to have a plane that is capable of flying straight.

Test mounting of radio receiver unit. Since the fuselage halves will be glued together I need a bullet-proof solution for the receiver. I thought of carving out some foam in front of it and having servo extension wires going into the front. So that when I will need the rest of those 8 channels I can just plug them in. And then I don’t need to tear down the foam fuselage.

I thought to have the ESC wires in front, slightly carved into the foam. So that when I shall have my FPV mount on place the cables won’t interfere with it. A future-proof build I intend to have.

I used a d 8,5 mm inner diameter plain washer to support wing retainer rod. So that the entry of the hole will not get sloppy with time. Epoxy glued it there.

I secured servo cables onto the wings with small blobs of epoxy. In case of damaged servo it can be removed with some dexterity. In normal use it will not allow the wires to vibrate. I left some length available so that I can connect to the connectors on the fuselage.

Rudder and elevator servos are glued in place. The cable channel could be used to glue there a 20 cm servo lead extension wire coming from the receiver. This will allow me to connect aileron servo leads coming from the wings with ease. Connector is solid fixed in fuselage, easy to connect to. I will mark polarity on the fuselage, ground wire is on bottom. As ground is usually.

Two half parts mostly done.

I even glued in the pushrod wires (bowden) along the fuselage.

Next I will need to locate the electronics to their respective location. The ESC and the receiver need a good fixation and wiring routing. I have a concept already, will develop it in detail.

This build is very exciting. I took my time with the wings and those small details that deviate from the standard build. I know that it is very difficult to have a perfect build from the start but I would like to get as few mistakes in my build as possible. We shall see how I manage.

Best regards,

Sir Crash a Lot