How to start
Thank you for your interest in Kraga models.
Although one of the main goals was to create design which is printable on every printer, it may happen that your software or printer is not able to print it. It is very important to start with the printing of a test part.
After you printed the test part, you can proceed to purchase using PayPal or credit card. All your plans and detailed build guide are availabe for download under my account section. Then you can print your plane, assembly it, cover it with covering foil, install electronics and finally enjoy flying. In following chapters you can find high level overview.
How to print
There are two kinds of parts, one that should be printed as solid (fuse and accessories - all blue parts).
This is common way of printing objects and these parts should be printable on every printer.
Second kind (wings - all orange parts) has to be printed as shell - 0% infill and no horizontal surfaces (thickness of the shell is one layer). Only this way you can achieve required weight of the plane.
You can use any material you like, the limitation is high temperature from the iron when covering assembled parts. Heat from the iron can deform the parts. Although I was not able to damage any parts and I tried to cover with foil many materials (ABS, PLA ...), please test film covering on you testing part as you may use different material than I do.
Another goal when designing KRAGA models was to use minimal or no support during printing. Removing support after printing is big pain and you can easily destroy your part. That is the reason why you should use default orientation of all parts during printing. There are only two parts from whole plane which require support, these are from plane fuselage and are printed as solid. The rest of the plane should be support-free.
Nozzle: 0.4 mm
Layer thickness: 0.19 mm
Check out printing settings shared by others.
How to assembly
Assembly is very easy and fast similar to stringing needle to a thread. To assembly the plane you have to glue together parts that you printed out and parts that you bought separately (carbon spars, hinges - they are not included as part of the sold product). Whole assembly process is described in higher detail in build guide. Another option is to watch assembly guide video.
What else do you need - your shopping list:
|carbon tube||⌀ 2x1 mm ↔ 1 m||3|
|carbon tube||⌀ 4x3 mm ↔ 1 m||3|
|carbon tube||⌀ 6x4 mm ↔ 1m||1|
|carbon tube||⌀ 10x9 mm ↔ 520 mm||1|
|carbon rod||⌀ 3 mm ↔ 220 mm||1|
|carbon rod||⌀ 4 mm ↔ 250 mm||1|
|covering film||↔ 2 m||1|
|push rod *||↔ 80 cm||2|
|pinned hinge||↕ ↔ 16x28 mm or smaller||10|
|folding propeller||up to ↔ 10 inch||1|
|spinner||⌀ 40 mm||1|
|other common accessories (clevises, servos, motor, esc ...)|
How to cover
There is nothing special about covering 3D printed planes. It is done the same way as you would do with common balsa RC plane.
It is important to test film covering on testing part before you start.
If you have no experience with film covering my advice is to try more brands of covering film before you get frustrated. It is easier to work with some than with other. I tested couple of brands and in my opinion solarfilm lite is the best option for 3D printed planes from Kraga.
How to choose electronics
This is by no means the best way possible how to setup your plane.
This is just list of affordable parts that I believe could be good starting point for beginners.
Turnigy Aerodrive SK3 - 2836-1040kv Brushless Outrunner
With this motor Kodo will be no rocket. But it is enough for a little bit of fun. On top of that, it will fit nicely into the fuselage and you should have no problem setting the CG.
Suitable propeller sizes: 9x6, 9x7, 10x6.
HobbyKing 40A BlueSeries Brushless Speed Controller
Optionally you can use programming card but It should work fine out of the box.
Turnigy nano-tech 950mah 3S 25~50C Lipo Pack
or Turnigy 1250mAh 3S 30C Lipo Pack (Long)
These are a few of many options if you are going for as light plane as possible to do more gliding and thermal flying. In this case you can move ESC and battery into the front of the fuselage next to each other (parallel config). You can choose other battery but keep your size and weight within these limits if you want to go light.
Turnigy nano-tech 1500mah 3S 25~50C Lipo Pack
This is again one of many options if you want to fly more using motor. For heavier batteries you need to put ESC into the front of the fuselage area and battery behind it (series config).
This depends on your transmitter. Only requirement is to have 5 channels or 4 if you are going for pure glider (no motor).
Turnigy™ TGY-9018MG MG Servo
It is an analog servo with metal gears for reasonable price. You can use 4 of these (2 in the wings, 2 in the fuselage) and they will fit everywhere just fine.
Latest version of detailed build guide
Download build guide
You will find the same file attached to the model plans available for download after the purchase.