UNDERSTANDING RC HELICOPTER CONTROLS AND THEORY 101.
“Oh-No, THEORY and rc helicopter controls” I hear some of you saying. “THEORY” – I thought this was suppose to be “fun”! Yes this will be fun - I promise. I am not going to put you to sleep with an in-depth aeronautical engineering course. If you want that kind of information – you won’t find it here.
If you are looking for a more advanced
and in depth explanation of the theory
behind how helicopters fly, I highly
recommend this book. It is technical
but well worth the read if you have a
passion for helicopters like I do.
My goal is to give you enough information to understand why a RC helicopter can fly in the first place and how we control it. You must first understand these basic principles before you can learn to fly a RC helicopter... it's that simple.
Yes, now comes one of those times that your high school physics teacher warned you about. You know the old “one day, this information will come in handy” statement to make some attempt to keep us all awake. Didn’t work for me – how about you?
So how will I keep you awake this time around? First, we are talking about something real here – your RC helicopter that you just spent a significant amount of time and money on. I think you will want to understand how it flies and how RC helicopter controls work – right? Second, this really is neat stuff - it is another reason this hobby is so rewarding.
Speaking of RC helicopter controls , you should also know what
is (that link takes you to my CCPM page).
As I have said before, single rotor collective pitch RC helicopters are, at first, not easy to fly. They have the exact same controls and follow the same laws as full size helicopters. The first step is to understand these forces and laws. It will then be an easy matter to understand how a helicopter is controlled.
To make this as simple and basic as possible, I have broken helicopter flight and control down into three very basic areas:
Lift & Collective Control
Direction & Cyclic Control
Torque & Tail Rotor Control
By fully understanding these three basic areas of helicopter flight, you will have a much better idea of how helicopters fly and understand RC helicopter flight controls much better.
Like I said, this is pretty basic stuff, but you need to know it!
Here are also some very well done and entertaining videos explaining and demonstrating RC helicopter controls and basic heli flight physics. I am very impressed by them and they are well worth watching!
The 3 Basics - Lift, Direction, & Torque
Visual Demonstration of Collective & Cyclic
Dissymmetry of Lift & the Helicopter Speed Limit
Now let’s look at two other areas of helicopter flight theory that are a bit more advanced. By understanding the first three, these two will make more sense. They are not crucial to understand, but it is nice to know they exist and how they affect the RC helicopter controls.
Ground Effect Hover
Gyroscopic Precession Video
So how did I do? Did I put you to sleep? Just remember, helicopters take time. If it doesn’t all make sense now, don’t worry. Come back to the explanation in a few hours or a few days and re-read it. Everything is more clear the second time around or as many times as you need.
Still a little confused? Here’s a little trick that I use all the time...
Simply visualize what is going on while your helicopter is flying. Unlike RC planes or cars, RC helicopter controls seem a bit abstract. You now know how a helicopter flies and how to control it.
Visualize yourself in a nice solid hover. What happens if the heli starts drifting to the right? What control input do you give and what is happening on the helicopter to achieve the result from that control input?
If you can think and visualize what your helicopter is doing before you even begin learning to fly, you will have a big advantage over others who learn by feel alone.
Who said there was anything wrong with day dreaming. Have fun with the process.
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