Showing posts from 2017


This company publishes new products almost every 2 weeks, and I have received their new VTX which is loaded with new features.
Let's talk first about specifications. Mine came with RPSMA female antenna connector (there is a MMCX version too), standard 40 channels , 25mW/200mW/500mW/800mW power switchable and 7-24V input that provide 5V output for your camera. Weights only 7 grams without antenna and cable, and small enough to put it on any type of vehicle New feature is Smart Audio port which allows you to change channel band and frequency and even power output via your BetaFlight OSD controller (and radio of course). If you do not have that type of controller, you can change manually all parameters with button on the VTX. 7 segment LED display shows which band is in use , number of channel and power output mode. Another feature is PitStop mode. What is that ? Well, for FPV racers it is good thing, when you want to change channel frequency, you put it in pitStop mode. That mode tr…

H-King Junkers Ju-87B-2 Stuka 1400mm (55") ARF

This is ARF kit and demands some knowlege and a lot of patience.
So let's start.

First is the wing, I would suggest you that you read manual very carefuly, count those hinges, they are different for flaps and ailerons. Also, be careful with static flaps, flaps and ailerons since there is left and right side ones.
Test fit everything before gluing.

Hinges are glued with CA glue. Each slot is cut for particular hinge type, but as said before, test fit hinges before gluing them.

Control surface hinges are all the same and you can't miss there.
When glue dries, mount control surfaces to hinges using M2 macnine screws provided. Use loctite on your bolts and don't tight too much those bolts, control surfaces need to move easily.

I would suggest that at this time you insert servo extension leads in both wings and fix them with some masking tape.

Mounting landing gears is easy, I used 5 min epoxy for wooden blocks that come into landing gear cowling (manual says use CA, it's up…

AKK K33 40CH FPV Audio Video Transmitter

As with all AKK equipment received in past couple of months, this one comes well protected in the box.
What can you find in the box is the transmitter, standard stick antenna, connecting cables and short manual.

Transmitter itself has 2 buttons and 2 LED 7 segment displays which are really bright.
Weighting only 8.1 grams without antenna and cables it is suitable for any application like mini quad, RC airplane, flying wing etc.
Antenna connector is placed on the top of transmitter (there is a version with side antenna mount called K22) and it has standard 40 channels transmission divided into well known bands A,B,E,F and R.
Frequency chart is provided in the manual.
Changing band and frequency is really easy with provided 2 buttons on the side of the transmitter itself. One button changes band which is displayed on the first LED while second button changes frequency on that band and is displayed on the second LED display as a number from 1 to 8.
And that is it, select your preferred c…

AKK A5 FPV AIO split system

There are a lot of similar products you can find in various Chinese shops, I had one that is not split system couple of months ago and was not happy with it.

This little thing really surprised me. Why ?

Well, let's start.

Most of AIO systems are in one piece. This is split system meaning that VTX is separated from the camera.
Though non split systems are good for micro quads, if you are planing to use FPV on micro airplanes like UMX series from Parkzone, that could be the problem.
Those micro airplanes are very light and adding AIO FPV on them will change the CoG of that airplane, so flying will be almost impossible.
That is where this split system comes. You can put a camera on the nose and move VTX little further away to have correct CG on the plane.

Or maybe you want your camera to be inside canopy and VTX outside.

Another problem with system that are all in one piece might be that you would like to add OSD.
OSD comes in between of camera video signal and transmitter, and since…

AKK CA20 camera and TS5828 VTX

Let's try something new.

I just got AKK CA20 camera and TS5823 VTX at a unbelievable price (camera is 20$ and VTX 10$).

My expectations for such low cost camera was not big, but this little thing surprised me with OSD and bunch of features (some of them I still do not understand well). 
With the camera you also receive a bunch of connecting cables and one with small controller for setting the camera features (a lot of them)-

Manual is really basic, and that is the only minus for this product. I would love to see better manual with explanation of all features that camera provides.

Lightweight camera (12.4 grams only) can operate from 5V up to 22V (so you can take power even from your receiver) and has an excellent picture and nice colors .
It is 600 TVL NTSC standard and manufacturer claims that there is 1/3" SONY SUPER HAD II CCD,Nextchip 2040 DSP in it.
According to quality of picture, it sure is.

Link to product:…

How to cover foam airplane with standard covering film

I have heard that people are using standard balsa covering film to cover foamies and I had to try it.
And it really is very good solution. Gives the model some stiffness and if you use different colours, you don't have to paint it.
I don't have modellers covering iron, but use standard iron that every house has. Just be sure to set it to synthetic, which is approximate temperature good for covering depron and balsa parts.
But I suggest you to test first on some scrap piece of foam. Temperature too high will melt depron and foam and shrink covering film too much.
Usually I cover only control surfaces with covering film, and sometimes whole airplane.

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How to setup dual ailerons and flaperons with Spektrum DX6 DX7 DX8 DX9 DX18 radio

Easy setting up ailerons in three different ways with Spektrum radio explained. Each way depends on your airplane setup and each way has its own pluses and minuses.
If you get stuck, just ask in comments and I will respond as soon as I can.
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Spektrum DX6 DX7 DX8 DX9 DX18 elevon setup / delta wing setup

Setting up a delta or elevon mixing on Spektrum radios are very easy. It can be confused where to use ELEVON or ELEVON-B mixing, and this video describes the case on how to setup Spektrum DX6 DX7 DX8 DX9 DX18 elevon mixing.
If you can't get proper control surface movement by ether of 2 elevon mixings, just switch servo connections on receiver and try this procedure again.
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OrangeRx R1220XLR Review Part 2

OrangeRx R1220XLR 12Ch 2.4GHz DSM2/DSMX Compatible Long Range Rx w/Sat, Div Ant, F/Safe & S.Bus and telemetry from HobbyKing flight review.

Finally flight test of new Orange receiver. I was skeptic because with V1 and V2 receivers I didn't have good telemetry range, but with this one everything works fine.

Now HobbyKing, make those Long Range receivers in 6 ch, 7 ch, 8 ch and 9 ch versions, please.

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OrangeRx R1220XLR Review Part 1

This is a third version of Orange receivers which support telemetry data. First version was very bad , I could get telemetry data only up to 15 meters from me while flying my airplane. Soon they released V2 of telemetry receivers claiming that telemetry data range is up to 500 meters. Well, I bought that one too. Telemetry range was improved but not as claimed. I could get maximum of 80 to 100 meters of telemetry data. I have to point out that receiving signal range for control of the aircraft never was an issue either in V1 or V2 telemetry receivers, only telemetry data range. This one is, so called, Long Range receiver, with control range up to 3.5 kilometres and telemetry data range up to 1 kilometre, at least that is what specification says.  And here is Part 1 of review. Unfortunately, at this time there is only 12 channel receiver available , either with S.BUS or CPPM output. I hope that if this performs well, HobbyKing will make 6, 7, 8 and 9 channell versions. Link to product: http…

Buying a 9 gram servo for your RC airplane

As I have been for 8 years in this hobby, I have used couple of different servo manufacturers for my foam airplanes.
Since there are a lot of cheap Chinese servos on the market, I made this video to help you decide which one to buy.

You can always play on safe and buy Hitec HXT900 servo, but these TowerPro SG90 are much cheaper and have the same quality as Hitec ones.

The problem is that there are a lot of bad copies on eBay and you have to be careful when buying the original ones.

So, check my video and here is the link on eBay from which I have purchased my servos last time:

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FT Racer Ripslinger

When I first saw video on FliteTest about building this airplane and that it doesn't have any "hard" wing spar e.g. carbon rod or wooden spar, I was a little skeptic.

Then, friend of mine made one, and when I saw how it flies, I was suprised .

The other thing that amazed me is using a hot glue. I never used hot glue before for building depron airplanes, I used mostly UhuPor and 5 minute epoxy.

So I have decided to make one and give it a try.

After printing PDF plans and transfering parts to depron board I realized that this one will be finished very quickly.

As I saw on FliteTest page that there are couple of variations for canopy, I have decided to make Ripslinger version.

You can't find cardboard in my county, so those parts are just plain paper with printed colour on InkJet printer and then covered with transparent self adhesive film.

Rest of the model is not painted, but covered with covering film (like balsa airplanes). That was my idea to use covering film on …

H-King Composite North American P-51D MUSTANG 1200mm (47")

H-King Composite North American P-51D MUSTANG 1200mm (47")
Well, I just love warbirds, there are couple of them in my hangar, all of them are foam models.

When this nice airplane was announced , I just said to myself that I've got to have it.

To say the truth, it is not cheap plane, you need to purchase all electronics, ESC, servos, motor, propeller, battery and have your own radio and receiver. It comes with servoless retract gears which is nice surprise. But it surprised me how well built the model itself is.

Starting from the fuselage, which is made of composite material and painted extremely nice, with all possible details, over to wings and control surfaces. One minor issue is that on some spots on the wing you will need a little ironining, but that is no big deal.


Getting it ready for flight takes some time, at least 2-3 full afternoons of work if you want to do everything right. Installation of servos take time, because you have to prepare servo mo…

NTM Prop drive 35-48 1100 kv brushless motor from HobbyKing

Well, they announce this series as high quality brushless motors, and I had a couple of different types from NTM series with same issues.

This motor is very bad, don't buy it!!
I have used it for my H-King Composite North American P-51D MUSTANG 1200mm (47") and only did maiden flight with it. It has a lot of vibrations, and when I disassembled the motor I could see why.

Bearings are unmatched with the shaft and there is too much of free space between shaft and bearing itself.

Replaced it with TurnigyD3548/4 1100KV motor which performs excellent.

I noticed that other customers had similar issues with these motor series so my suggestion is to avoid them.

You can see on my video how it looks inside:

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Scratch build RC airplane tutorial - Part 4

Maiden flight

Well, there is not much to say about this, I was waiting for weather to calm down a little.
Finally, sun came out and I have prepared to record maiden flight.
It was a windy day, but this model can manage that.

I had great help from friend of mine who flies mini quad racers, and he recorded great video by chasing me in the air.

Enough talking, just watch the video.

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Scratch build RC airplane tutorial - Part 3

Scratch build RC airplane tutorial - Part 3 - Paint

I thought that Part 3 will be maiden flight, but weather in Croatia didn't allow me to go at the field and make one.
So I have decided to do a simple paint job on this model.
Maiden flight will come very soon since it is recorded yesterday , and I need some time to put it all together.

First, let's do the canopy. Cut canopy from template and transfer it to any type of self adhesive covering you gave. I had blue one that fits just nice. Make sure that you cut mirrored canopy for the right side the other side

Let's continue by marking parts that will be painted with masking tape.
I have decided that I will paint only leading edges of the wing, wingtips and vertical stabilizer tip.

The best result you can achieve is by using paint roller.
Paint used is water based red paint. You can use any water based paint for making your airplane look nice.
You will need 2 layers of paint. Since this is water based paint, it dries pretty…

Scratch build RC airplane tutorial - Part 2

Scratch build RC airplane tutorial - Part 2
Time to continue. First, sand the control surface edges to 45 degrees, both ailerons and elevators. If you don't like sanding, you can do that with sharp hobby knife.

Do the same 45 degree bevel on wing where control surfaces hinge. Sand the leading edge of the wing to round.

Now, you need to make a groove in the wing for wing spar.
Grove can be made with dremmel rotary tool or just by cutting the V shaped groove with your hobby knife.
For wing spar  best to use is carbon tube 4-5 mm diameter. If you can't find that, you can also use balsa square rod, or purchase plastic arrow at hunting and fishing shop and cut to size.

 Mix some 5 minute epoxy glue and fill the groove with it.

And finally put the spar in the groove.

Be sure that wing is on flat surface, use some wax paper to cover it and put flat weight on the wing. I use books, but you can use anything you like.

Finally, when glue cures after 30 minutes, add transparent packing t…