Archive for April, 2009

The E-SKY/FMS free flight simulator and how to use it

Saturday, April 11th, 2009

Owners of electric helicopters cite flight simulators (“sims”) as one of the best tools to improve their flying technique, whether they are piloting their first aircraft or flying at competition level.

A flight simulator allows pilots of RC helicopters to practice in all conditions, on all terrains, at all levels. For the beginner, though, it is particularly useful. Being told that there are two channels on your remote control “forward pitch” and “cyclic” is one thing; using them is quite another!

For this reason, several electric helicopters come with simulator software included, including the co-axial E-SKY Co-Comanche, and the fixed-pitch E-SKY Honeybee. Both these are considered beginners’ craft, and both come complete with an FMS sim pack. This includes the USB cable and free software.

Full details of FMS can be found on their website, which also has a FAQ section, as well as an excellent forum.

Freeware downloads can be a bit daunting. However, all the sim packs provided with E-SKY and other electric helicopters are completely safe and secure from threats.

Since FMS is a freeware application it is worth seeing what you get for nothing. The answer is: Quite a lot, especially as you are using your own transmitter rather than a “copy cat” version purchased separately. Remember, though, that the USB lead provided is unique only to your radio control and isn’t compatible with the FMS control unit.

What does this mean? Well, purchased simulation packs for electric helicopters and planes usually come complete with an RC lookalike, called the control unit (CU). This works on the PC chopper, but not your real one. Some people purchase FMS control units as they save on batteries, but so long as you are aware your transmitter needs to be switched on during virtual flights, you’re better off sticking with what you’ve bought. Just remember to keep a stock of batteries nearby!

Once the FMS software and transmitter are installed, a pop-up menu appears in which you assign each of your channels. Guidelines for this can be found on the FMS web page. The joysticks are then calibrated and centred (instructions for this are on screen) click “finish,” select your model from the list of radio control helicopters on screen, and you’re ready to fly.

Considering this is freeware, it’s an impressive program. The myriad programs tax even the most skilful flier, and The 3D graphics make this the ultimate flying experience. Whether it’s to start off on, practice a new technique, or just have a bit of fun, all pilots of electric helicopters should have one of these.

Using a flight simulator – no crashes necessary!

Friday, April 10th, 2009

Beginners learn to fly their radio control helicopters in a variety of ways, the easiest being to open the box, charge up the batteries, and hope for the best.

A lot of new skills will be acquired this way; unfortunately, the first one is generally the crash landing. The sounds you most often hear from a keen beginner are not cries of wonder, but words of woe (generally followed by, “Now, where did I put the receipt. Wonder if I can get away with claiming it was like this when I opened the box?!”) A heck of a lot of electric helicopters have ended up abandoned in garages in this way.

In order to get the best results with the least amount of worry it makes sense to invest in some training materials. We have covered the training undercarriage elsewhere, but another alternative is to use a flight simulator, or “Sim.”

Flight Sims are programs that are downloaded to your PC via a CD Rom (which avoids the need for broadband connection). Using a Sim is – excuse the pun – sim-plicity itself. The program is loaded onto your PC, either from a CD Rom or direct off the internet; the radio control is connected via a USB cable, and you’re away. As the programs cover both planes and RC helicopters, and one handset often controls several different designs, you may have to choose your model from a drop-down menu, but that’s as complicated as it gets.

With great graphics and a range of training programs available, from beginner to advanced, you can perfect your flying skills before your helicopter ever leaves its launch pad.

The pros and cons of fixed-pitch RC Helicopters: Part 2

Thursday, April 9th, 2009

After the 3-channel, micro co-axial electric helicopters, fixed-pitch 4-channel models are generally considered the easiest for beginners to fly. However, they can still be tricky to learn.

For a start, the pitch in this instance refers only to the altitude control, i.e. the angle of the main rotor. In fixed-pitch helicopters, lift is attained by means of the throttle alone. In collective pitch, it is a combination of throttle and rotor adjustment. But the directional or cyclic controls are the same for both.

For fixed-pitch RC helicopters the radio controls are as follows:

One channel controls the speed of the main rotor and the speed of the tail rotor where it is belt or shaft driven.

The second channel controls the pitch of the tail rotor, and/or its speed where it is driven by a separate motor. This stops the helicopter spinning by torque effect. It also turns the helicopter left or right, so is often termed the rudder control.

The third channel controls the forward and back movement, or cyclic pitch.

The forth channel controls the side-to-side movement, or cyclic roll.

Although fixed-pitch electric helicopters have one less control, much of the piloting remains the same. However, a lack of rotor adjustment does give them a serious disadvantage over their collective-pitch counterparts: they are notoriously slow to respond to throttle control, which makes it impossible to perform advanced moves. Even in simple hovering, responsiveness is of the essence for success.

This is because the weight of the rotor assembly causes inertia (when speeding up) or momentum (when slowing down). Although this can be compensated in CP electric helicopters, there is no such adjustment available on fixed-pitch aircraft.

This makes hovering tricky. The pilot accelerates to a certain level so he can hover, and then closes the throttle down. But momentum carries the craft on upwards. Then, when it does begin to drop, inertia means it is slow to respond to the increased power needed to keep it airborne. Instead of smooth acceleration and a steady hover, the pilot ends up performing a series of ‘bunny hops.’ Taking the helicopter into a turn from this position requires even more skill, and a training rig is essential to avoid expensive crash landings. Perhaps it is just as well that fixed-pitch helicopters are not capable of advanced aerobatics such as inverted flying.

Fixed-pitch RC helicopters are certainly a worthy introduction to single rotor flying and are generally cheaper on parts than their collective-pitch equivalents. However, if you are planning to fly outdoors, it might be best to start how you mean to go on, and invest in a collective-pitch model. There really isn’t that much more involved.

The pros and cons of fixed-pitch RC helicopters

Wednesday, April 8th, 2009

For those who have decided upon a single-rotor helicopter it seems the answer has got to be yes. Whether it is belt-driven, or driven by its own separate motor, that tail rudder is tricky enough in itself, without having to add collective-pitch to the mix.

Yet for every person saying that fixed-pitch choppers are easier than collective-pitch, there is someone else saying the opposite.

It is certainly true that, for beginners who intend to follow their hobby to its max, collective-pitch RC helicopters are best. Although learning the basics takes longer, there is no tricky switching of techniques and both they and their machine will “grow” together. As far as crashes go, these can be minimised by use of a training kit. It’s worth remembering, too, that whilst it is possible to “steer” a stalled CP helicopter back to earth, there is no such option for a fixed-pitch machine. They fall out of the sky like a sack of potatoes.

But many an absolute beginner has never gone further than taking their 6 Channel bird out of its box; flawed at the outset by the complicated sequence of controls needed for even the simplest of manoeuvres. An obvious plus to fixed-pitch electric helicopters, therefore, is the number of channels – 4 as opposed to 6.

But flying isn’t just about twiddling knobs. It’s about how RC helicopters respond to those twiddles and, unfortunately, this is where fixed-pitch electric helicopters come unstuck. The next article will look at this in more detail.

RC helicopters for beginners: a short Torque about rotation

Tuesday, April 7th, 2009

Radio control helicopters are divided into two types: twin rotor (co-axial), and single rotor models. Single rotor RC helicopters are further divided into fixed pitch and collective pitch models.

It is generally accepted that co-axial RC helicopters are the easiest for beginners to get to grips with. The 3 channel models in particular, are a great way to learn the basics of flying. They can also be addictive fun - the Salvation 12 Combat Helicopter kit comes complete with infrared missile launchers and sound effects! The reason these little electric helicopters are so easy to fly, is because they lack a tail rudder. But why is this?

The physics of helicopter flight is governed by torque. Simply put, this refers to the force applied to the helicopter body by the turning rotor. Above a certain level, the power of the rotor will cause the helicopter to turn in the opposite direction – unless a secondary force is applied.

In radio control helicopters, this is done in one of two ways; either a contra-rotating blade on the central axis (co-axial) or a vertically mounted tail rotor (single rotor) It is that tail-mounted rudder (as it is often called) that makes flying most RC helicopters such hard work; even fixed-pitch models need a minimum of 4 channels, and balancing the two rotors whilst manoeuvring the chopper through its paces is no easy task.

In contrast, piloting a 3 Channel co-axial is simplicity itself. The two rotors work together, so in this way the controls are just like those of single rotor RC helicopters. But with no tail rudder to worry about, the pilot can concentrate on perfecting their up/down, left/right and forward/backward manoeuvring.

Or, of course, concentrate on shooting Junior out of the sky.

How your RC helicopter flies – the take-off and forward movement

Monday, April 6th, 2009

You have the remote in your hand; you may even have an idea of what some of the controls do. But how do terms like “cyclic pitch” relate to what is happening in the air? Remember – your electric helicopter is not a toy; it’s a scale model of the real article, and it obeys the same rules. Understanding a little about flight dynamics will go a long way towards you getting the best from your purchase.

Here, we look at how the craft takes off and travels forward. Although this series of articles is aimed primarily at collective-pitch owners, many of the concepts are common to all three types of RC helicopter.

Electric helicopter flight is controlled by the pitch of the rotor blades (both central and tail rotors) plus the thrust from the motor/s. Collective-pitch helicopters are so-called because the pitch of all the rotor blades is changed simultaneously. With fixed-pitch helicopters, only the tail rotor is adjustable.

The throttle speed and collective pitch are linked together. At standstill, the rotors are in “flat pitch” mode and the clutch is disengaged. The tail rotor may be driven by the same motor or have a separate engine, but in both cases the RC helicopter rotors are connected via a clutch and gear mechanism.

As throttle speed increases, the clutch engages and both rotor systems begin to turn. Once the main rotor is up to speed, collective pitch is activated and the RC helicopter begins to lift. At this point, both cyclic pitches are in neutral. To hover or change direction, other forces have to be applied …

Introduction to the training undercarriage

Sunday, April 5th, 2009

The hover is an essential skill for any RC helicopter pilot to learn. Yet although it looks simple, it is the most difficult of all techniques to master. Considering how easy it is to write-off an electric helicopter, and that even simple landing can be fraught with difficulty for the beginner, it is false economy not to invest in a basic training rig.

There are two types of training kit for radio control helicopters. The first is a stand, where the chopper is anchored in place whilst in operation. This is a good choice for indoor flying as it is not going to crash into anything. However, some people have reported cases of damage to their craft, and even personal accidents when RC helicopters have come adrift during flying.

A better option is the purchase of a training undercarriage. Most beginner pilots, working without a training kit, find it impossible to prevent the RC helicopter from tipping over whilst hovering. The kit provides a floating “cushion” of support, stabilising the craft by providing a larger surface area than the landing “skids” provide, and spreading the load over a much larger area. It also provides a buffer in case of crashes.

Because the craft is being flown in a natural manner, users prefer undercarriage kits to training stands. They are quick to install and remove, cheap to buy, and novices can master all sorts of techniques, from simple landing to advanced “nose-in” hovering. When they return to conventional flying, they invariably find their electric helicopters a whole lot easier to handle.

Training kits are available for all types of RC helicopters, from micro co-axials to large CP machines. The most common design is a set of crossed sticks with soft balls at the ends, which is attached to the undercarriage with cable ties. There is no need to remove the skids. Although the balls are designed to stop the sticks digging into soft ground, the best operating surface is a solid one.

Pitch, yaw and flying your RC – a short lesson in controls

Saturday, April 4th, 2009

In order to fly your remote control helicopter to the best of your ability, it is important you understand the basics of how it works. So – let’s get started!

First off it’s important to remember that RC helicopters are identical to the full-sized version, in terms of flight dynamics. The only difference is, the pilot is on the ground rather than in the cockpit. This is especially true of collective-pitch (CP) models, which are the most complicated to control.

The word “pitch” refers, in fact, to several things. By combining various actions on the control pad, and then sending those signals to the servos and gyro mounted on the RC helicopter, a pilot can do anything his full-size counterpart can do. Let’s take a closer look at them.

Collective pitch Only present in CP models, this alters the angle of the main rotor blade. It is always used in close combination with the throttle. Although tricky to learn, it is necessary for advanced flying moves.

Fore/aft cyclic pitch. Regulated by the tilt of the main rotor blades, the control is often called the elevator. It allows forward/back movement, and also moves the helicopter up and down.

Left/right cyclic pitch. Also called the cyclic roll, it allows for turning and banking movements.

Rudder control. Also known as “yaw”. Works in connection with a tail-mounted gyro. Changing pitch or speed of the tail rotor causes the RC helicopter to turn left or right.

Choosing the right ’copter for you: the “Pitch”

Friday, April 3rd, 2009

Just as with their full size cousins, RC helicopters depend on a combination of factors to remain airborne, and to perform intricate manoeuvres. For this reason, radio control helicopters – in particular, the collective-pitch type - are the most difficult of all RC models to operate properly, and the easiest to crash when first starting out. We all know how difficult it is to fly a full-size helicopter, and models are no different!

A helicopter relies on a combination of pitch and throttle power to fly. Depending on the model, this can include the main rotor pitch, cyclic pitch and tail rotor pitch. Some radio control helicopters (the co-axials) have two counter-rotating blades on the central axia, and no tail rotor. With others (fixed-pitch craft) the central rotor is not adjustable, although the tail rotor can be adjusted.

Both co-axial and fixed-pitch craft have fewer moving parts to operate, and thus are easier to fly. The downside of this is that they are less responsive than collective-pitch helicopters. They are also restricted in manoeuvrability, unable to perform the 3D stunts that make owning RC helicopters so much fun. Nonetheless, the co-ordination needed to successfully operate a CP helicopter can be daunting to beginners.

When you consider that the 4 operations on a simple 4-channel CP control are: collective pitch, forward/back cyclic pitch, side to side cyclic pitch and rear rotor pitch – and that is before we have even touched the throttle - it is hardly surprising that beginners look for anything that might make their job easier!

A beginners guide to RC helicopters

Thursday, April 2nd, 2009

Although helicopters are available in Nitro, gas and petrol powered formats, RC electric helicopters are one of the most popular choices. They are light, easy to fly, and the best for beginners.

Here, we will describe the various electric helicopters available, so you can choose what is best for you. The first thing to decide is – do you want to buy a RTF (ready to fly) part-built, or full kit model? In many ways the kit form is best, as building your own machine allows you to “see” deep into the workings of it. At some time you may need to repair or replace components and this is far easier to do if those components were first installed by yourself.

However, not everyone is mechanically minded or has the time to build from scratch. In this case, a part-built kit is the answer. In these, the main body is assembled leaving the owner to install the main working parts such as the engine, rotor blades and radio pick-ups. Since these are the parts of an RC helicopter most likely to need attention, this is a good alternative for those wanting to do some of the work themselves.

The third option is, of course, the RTF (ready to fly) electric helicopter. Most of the simple, palm-sized models are of this type. For the true beginner, this would seem to be the obvious choice. However, ready-built doesn’t necessarily mean easy to fly! There are other things to consider, such as the number of channels and whether the craft is fixed or collective pitch.

The ease of piloting your aircraft is governed by the number of channels the radio transmitter has. Each channel performs a certain function, thus the more channels there are, the more functions you have to control. RC helicopters are available as 3, 4, and 6 channel craft. Although it is possible for a beginner pilot to learn a 6 channel operation, it is best to start with 3 or 4 channels.

3 Channel electric RC helicopters are the easiest of all helicopters to fly. They are all only suitable for indoor use. The 3 channels control fore and aft (backwards/forwards) motion, up and down, and left spin/right spin. Popular with children and adults alike, they are an excellent introduction to the world of RC flying.

The 4 channel RC Helicopters have the above 3 functions, plus the ability to fly left or right. For many reasons these are a favourite for beginners as, despite their more complicated operation, they are still easy to learn and provide the best route for progression to the most advanced 6 channel RC helicopters. They are still fairly small however, and are best suited for indoor use unless the weather is very calm.

6 channel radio control helicopters are best suited to those with previous RC experience (for example, with fixed wing planes) or people who can confidently fly 4 channel craft. The extra channel allows for far more manoeuvrability and aerobatic display work. Naturally, this makes 6 channel RC helicopters more expensive, and generally only suitable for outdoors work. Beginners are much more likely to have crashes and cause real damage with 6 channel models. Whilst it is tempting to go for the biggest and best you can afford, it is best to work up to these.