4D aircraft is fun and challenging to fly, its VPP(variable pitch propeller) controls the direction of airflow, and enables the flyer to
do many 4D manoeuvres on a single transmitter. Meaning that you can fly your plane nose down and the pitch of the propeller can change to make it fly straight up. Here is what you will need to build a fully functional 4D aircraft. Be the first one to build it in your group, and wait for the oos and the ahs from your fellow R/C plane flyers.
What you will need:
-hobbyking hkt6a 6 channel receiver and transmitter
- Foam board or cardboard , card board is very cheap and extremely light
-pushrod, the type that can fit in your servo arm usually 1mm-1.5mm
-hingetape or plastic hinges
-Special 9"various pitch propeller with 1300KV motor set
-4 of the 9 gram micro servos
-hobbyking redbrick 30amp ESC
-Hobbyking HKT6A 6channel transmitter data cable
-3cell lipo battery
Step 1: The Plans
The plans you can get from anywhere, the most suitable ones are :
-extra 330 from hanger 9
-extra 300 from hanger 9
-e-flite tribute 3d
-arrow v3 4d plane(already on the market)
These planes can be easily modified to fit the vpp motor&prop system.
Step 2: The Wings and the Fuselage
Firstly, i cut the wing and the fuselage out of cardboard, then the horitzontal stabilizer. When i have done that , i use a hobbyknife to cut off the rudder, elevator and the two ailerons, i made sure that the control surfaces are large enough, because if you are flying inverted with the props close to the ground, you will need to pull out of a dive quickly.
Next, i cut out and then hinge the control surfaces with light weight tape.
I used a hobby knife to cut out a slot for the vertical stabilizer and glued it in place with hot glue and CA. and then reinforced the bottom of the fuselage with bamboo skewers.
Then i cut out the slot for the wing, and permanently glued it in place with CA and hot glue. That was definitely a very strong bond.
Step 3: The Electronics
I cut out lots for the servos, and CA them in place. Then i made my own control horn, and screwed them in from the bottom.
The pushrods are made out of the steel wire. They are lighter than pushrods and have the same characteristics.
After that, i checked the movements with a receiver battery pack. They are proven very good.
The aileron servo was hard to install because the top of the servo was accidentally stuck to the fuselage, so i had to pull the servo out, clean it and glue it back in place.
Step 4: The Power Source
I finally received the package from the Hobbyking Singapore warehouse. Every thing came in a pristine condition which was surprising. because somethings from hobbyking are usually either broken from the shipping or they are already broken. I hurried and unboxed the stuff. And then i connected the motor to the esc and soldered it in place. And did this process again with the battery. The motor was spinning at an incredible speed and had a lot of thrust to it. I had to hold it with my two hands. Then i realised i should have used he 2 cell battery, the 3 cell battery was too strong for the motor.
Then i connected the pitch control pushrod from the motor to a 9 gram servo. Which had worked perfectly.
I charged the battery and connected every thing together.
But the weather is so bad, it will be raining for a while and its freezing outside, it would do some damage to the prop, so i decided to postponed the flying date till the weather get better, and the wind is smaller.
I reprogrammed the transmitter for extra movement, now it really gives extra throw.