BigX is a bespoke vehicle designed and built to support research projects. It’s big, with a 900mm wheelbase which means it can hold up to 21in propellers.
The frame is manufactured by SoliDrone, the model of the frame is FR4X 900F. I got this prototype frame in order to build it and test it. The company will start selling this great frame soon, so, check their website for updates. They have a beautiful render that you can see here:
Specifications of the vehicle:
Foxtech S5010 288kv
Hobbywing XRotor Pro 40A
The carbon fibre plates are really thick, 3mm, which makes it very very hard and solid… SoliDrone, hehe… But that is one of the reasons why is a bit heavy. But considering the type of applications this one is going to be use in, it is just right. It’s big, 900mm wheelbase, and because of that, it can be equipped with very large propellers, but being foldable, makes it very easy to transport. This is a great feature.
So, how big it is??
At the moment I’m putting 18in props to this one, and its performing quite well, maybe I will put bigger props on the future.
I did several tests using two different batteries. Both batteries are Multistar LiHV from HobbyKing. The longest flight was almost 32 minutes.
Then I added a Raspberry Pi and using DronePilot, I made it fly autonomously in very different ways, and it performs great!! You can see in the video how good it flies. And as usual, the Scottish weather does not help, but this vehicle was able to fly under raining conditions and strong wind gusts, with ease.
Hexacopter built to carrying heavier than normal payloads (aprox 2.5kgs).
Tarot FY690S folding
Afro 30 (BL Heli)
Foldable 12 x 4.5
Weight (no battery)
This vehicle was made thinking in vibration issues transmitted to the camera and flight controller unit. Several techniques to ensure the vibration is damped to ensure great flights and reduce jello effect on videos.
Trying to take advantage of the foldable frame, making this vehicle easier to transport/carry while not flying. Sacrifices were made to ensure the foldable capabilities, one of them is the not-so-efficient foldable propellers.
The sound made by this rotor configuration is different from the common carbon props one (which I prefer), but it appears to be more silent. Wind resistance is normal-great, the propellers stiffness might be a crucial factor here. It handles pretty well, especially when the landing gear is retracted (more agile…). Videos will come later.
The vibrations measured with the flight controller accelerometer when hovering (test performed at the firsts flights of a vehicle, to ensure it will perform great) are between the accepted values which are -5 to 5, the vibration showed on the plots never exceed +-3 which proves the vibration dampening of the motors and the flight controller is performing well. This will ensure great autonomous mission capabilities.
There is no enough data to have a conclusive opinion. Only 3 flights have being performed. The two batteries tested so far are Multistar 4s 10C (max 20C) on different capacities.
A tricopter is similar to a helicopter except that it has three vertical rotors as opposed to a helicopter one.
The basic design of a tricopter includes three motors, one of which is vectored.
The drive system should be configured to provide the highest amount of “thrust resolution” possible. In this context, thrust resolution means the amount of increase or decrease in thrust produced as as the transmitter or gyro instructs the ESC to change power to the motor. A higher resolution (smaller changes) allows the tricopter to make minor adjustments and fly smoother.
The lower the kv rating, the higher the thrust resolution. Motors under 1000kv are ideal for tricopters.
Three ESCs are required, one for each motor. The throttle of each ESC is controlled by a separate channel and has a gyro between the receiver and the ESC. This allows the tricopter to become stabilised by varying the speed of each motor individually.
Some ESCs have finer resolution when instructing the motor to change speeds. There is no documentation for this and has been found through trial and error. Please see the Successful Combos section when selecting ESCs.
The effect propellers have on thrust resolution comes by virtue of their pitch and weight. Low pitch and low weight propellors provide the highest thrust resolution.
First 3D printed quadrotor, very very similar to TEGO 1, same motors and ESC, just different frame. First one to be flow with the computer, making use of the multiwii serial protocol, and a computer joystick. The post is here.
Second version of 3D printed quadrotor, but 3rd version of TEGO. Using Rotites. Several configurations were built. Different range of motors. This version was used by lots of students, and its the most famous TEGO quadcopter. Some of them are in display in the James Watt Building.
This one fly’s autonomously using a MoCap system inside the MAST Lab.