The recent AUVSI show was the place to find flying, rolling, walking and floating drones and robots of all shapes and sizes. Right now I want to concentrate on the quadrotors that we saw at the show as well as other recent shows where quadrotors have been on display. You can check out all our AUVSI 2014 videos on Engineering TV and more images in Machine Design’s AUVSI gallery.
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Quadrotors have four propellers that allow them to deliver a very stable flying platform. They also come in all shapes and sizes from microdrones that will fit in the palm of your hand to larger systems that have longer flying times. Most of the smaller quadrotors are electric and have a flight time from 10 to 20 minutes. Larger ones tend to have gas engines with a longer flight duration.
Here are some of the quadrotors we have seen in our travels:
- Spiri And Kickstarter
- AR Drone 2.0 Four-Blade Platform from Parrot
- Parrot Bebop Drone and Oculus Rift Combine for a Virtual Bird's-Eye View
- Unmanned Flying and Rolling Orb (UFRO)
- InvertiX 400 Quadrotor Can Flip Over and Fly Upside Down
- Allied Drones Debuts Twin Rotor HL12 "Iris" UAV
Spiri And Kickstarter
I saw Spiri (Fig. 1) at this year’s Freescale Technology Forum. It was a successful Kickstarter project (see “Kickstarter Changes How Consumer Electronics Ideas Turn Into Gold”). One thing that makes Spiri stand out is that it is an autonomous drone that is also an open development platform.
The Spiri has a 1 GHz Freescale i.MX6 Dual Lite with dual ARM Cortex-A9 cores (see “Cortex-A9 Incorporates Electronic Paper Display Controller”) to handle the HD camera, a time-of-flight camera and communication while an STmicroelectronics STM32 handles navigation using the various sensors (Fig. 2). It also handles the low resolution downward facing camera. It has a 1300 mAh lithium power battery.
The time-of-flight camera is a bit unique and meshes well with the open development environment since this is an area that has yet to be exploited. It actually runs Ubuntu Linux on the i.MX6.
We first got a look at Parrot’s AR Drone 2.0 at CES 2012. I talked with Michael Pastor of Parrot about the AR Drone 2.0.
The AR Drone 2.0 is designed to be a remote control drone that can be flown using a smartphone or tablet. The app uses the mobile device’s touch and tilt sensors to control the drone.
The AR Drone 2.0 is semiautonomous. It can hover providing a stable platform. It can even flip upside down and continue flying.
Parrot Bebop is Parrot’s newest drone, the Bebop. It boasts a stabilized HD video system that uses digital optic stabilization. It can be combined with the Oculus Rift virtual reality headset and the Parrot Skycontroller to give you a real (well, virtual) bird's-eye view. The standard version has a 300 m range and an extended version is on the drawing board with a 2 km range.
Ok. Not your conventional quadrotor but definitely interesting. It can fly or roll. The Unmanned Flying and Rolling Orb (UFRO) is an experimental platform for search and rescue applications. It was developed at Oklahoma State University’s Unmanned Aircraft Systems.
The InvertiX 400 is a fixed pitch quadrotor designed for acrobatics. Designer Bobby Watts puts the InvertiX400 through its paces and flips. It is a commercial product available now.
Ok, I lied. Allied Drones was showing off a twin rotor system, not a quadrotor, but it has a gas engine as well as a battery driven version. The gas version has significantly longer flight time. The twin rotor design is supposed to be 30% more efficient than a single rotor, helicopter-style UAV.