Tiny remote control helicopters have become all the rage in the last few years as lightweight motors and materials have plummeted in price. But if you’ve ever played with one, you’ll know how hard they are to control.
That’s not the result of poor construction. Small helicopters are harder to control than big ones because of the laws of physics: moments of inertia drop in proportion to the fifth power of vehicle size. This gives small helicopters quicker response times, making them more agile. But the real killer is that the main rotor tip speed in a small helicopter is the about the same as it is for a large helicopter. So the ratio of the rotor moments to the moments of inertia can become huge and unmanageable.
That’s when you need to develop a model of helicopter dynamics so you can design remote control systems or an autonomous flight control system that can manage this agility, say Hardian Reza Dharmayanda and pals at Konkuk University in Seoul, South Korea.
And that’s what they’ve done in this paper: built and tested a control system for a Yamaha R-50 helicopter, which uses a two-bladed main rotor with a Bell-Hiller stabilizer bar. The next step, they say, is to make the helicopter fully autonomous using their model.
These guys may be re-inventing the wheel but it’s interesting to see how they’re doing it.
Ref: arxiv.org/abs/0804.4757: Analysis of Stability, Response and LQR Controller Design of a Small-Scale Helicopter Dynamics
I love messing around with mini helicopters but trying to get the hang of one once you have flown the real thing is a little difficult.
The controls do not match or at least overcompensate for the motion of the aircraft.
Using the stabilizer bar is a real breakthrough.
Nice article
Gute Idee und außerdem auch schoene Homepage.
i just wish to say as someone who did this before guitar superstars is definitely an online guitar learning program created to aid future guitarist take the first step in guitar understanding. But is it any excellent? or will it aid you to discover to perform the guitar? This post will discuss this matter.Guitar Superstars is an on-line training course which functions 7 teachers in a variety of actively playing techniques to guide you attain selection playing abilities. Their teachers array from jazz, blues, classical, rock, heavy rock, bass and additional. Lessons is going to be conducted from videos, through which you can download and perform it more than and over once more should you wish. We’ve now established that guitar superstars has a broad variety for you to polish your expertise whether you like rock, classical or whatever it is your preference.