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Your Reviewer

My Credentials
So who's doing this reviewing then?

Well I've been building and flying or driving radio controlled models for over 40 years and during that time I like to think I've built up a reasonable amount of knowledge.

I'm also a qualified electronics engineer who has worked in radio frequency, analog, digital systems and software for more than three decades. In fact I designed and built my first RC set back in 1969.

For the past nine years I've also been involved in the design and manufacture of some rather sophisticated engine technology and UAV flight control systems.

So, chances are I've been there, done that and have a huge pile of tee shirts to prove it.

Right now I'm heavily into 3D flying and enjoy all aspects of the RC hobby. I may be old but I don't feel it.

In the Pipeline

Here's just a little bit of what's to come on this site...

RC explained: Demystifying terms such as PCM, PPM dual conversion, single conversion, full-range etc., this feature will explain it all.

Cheap Chinese Engines: Just how good are those cheap Chinese glow and gas engines that sell for half the price of their "brand-name" equivalent? I put several to the test.

Build your own radio gear?: Back in the old days, building your own RC gear was not uncommon and now the arrival of 2.4GHz has made it practical again.


Review: FlySky/Turnigy/iMax 9x 2.4GHz RC system



Although well illustrated and laid out, the first edition manual I received was the worst piece of Chinglish I've seen in many years.

Here's an extract from the original first-edition manual (the mistakes are not mine):

Mix purpose to accuse of form to get rid of little mistake of organism, make it is it can take the heart conveniently even more to have not to handle. The very wanton one mixes accusing of among the channel"

Can you make sense of that?

Fortunately for some, the software is "inspired by" the JR 9X/9303 which is one of the easier to program Asian-made radios so you probably won't need to refer to the manual very often.

With support for five-point throttle and pitch curves, four CCPM swashplate modes, up to seven programmable mixes, flight modes, servo delay, and all the other usual programmable functions of a hi-end radio it's just as well programming is so easy or the manual would drive you mad.

The illustrations showing how to bind (they call it "pairing" the receivers was a little too small and indistinct for my old eyes but it's a simple task once you work out what you're supposed to do.

Unfortunately, no advice is given as to how the receivers should be installed which is a shame because the performance of all 2.4GHz systems is highly dependent on a good installation and this is not necessarily intuitive.

The technical stuff

Very little technical documentation or specification is provided with the iMax 9X.

Based on my own tests and observations, the system appears to be a non frequency-agile DSSS system, not dissimilar to the Assan system, another 2.4GHz product out of China, although Assan have upgraded their system to use two separate parts of the band now.

Being non-agile means the iMax 9X is not as well suited to extremely harsh RF environments as either the Futaba FASST or Spektrum/JR 2.4GHz systems but given the price differential this system definitely has a place in the market.

Despite being sold as a transmitter/receiver pair, the system is actually module-based so it is necessary to set the transmitter to PPM mode when using it on 2.4GHz. Unfortunately this means there is no failsafe capability -- a big minus point for some types of models such as large or fast craft that could cause danger to human life if they were to get hit by interference.

Switching to PPM mode also reduces the number of channels from nine to just eight so perhaps they ought to call this the 8X 2.4GHz system. Having said this -- the Futaba 9C suffers the same limitation, only offering 9 channels in PCM mode.

And speaking of PCM... an FM transmitter module and PCM receiver is also available for the iMax system, effectively making it a traditional narrow-band system.

This helps explain why, despite being sold as a 2.4GHz system, the transmitter also has a conventional telescoping antenna fitted.

Page 3 (The Receivers)

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The Blog

Updated: 20 Sep 2012
Here's a blog that will keep you informed just what's going on behind the scenes at RC Model Reviews and also tells you a little more about myself.

How compatible are 2.4GHz RC systems?

23 Mar 2010
How come there's no compatibility between different brands of transmitters and receivers? Why can't you use a cheap Chinese receiver with your Futaba FASST radio?

How to get a product reviewed here

4 Mar 2010
Since this has become a very frequently asked question, I've posted this simple guide to getting your product, or a product you're thinking of buying reviewed here at RCModelReviews

How servos work

Useful information on what's inside your servos and how they work.

The Good Oil

Important facts you should know about the oils that are used in our model engine fuels.

Heads-Up: 2.4GHz RC systems tested

How well do five different 2.4GHz systems stack up when hit by interference? The answers are here, with more to come.

Review: Bushnell's $80 Speed Gun

Yes it does work on model airplanes but there are some limitations involved with this bargain-basement radar speed gun.

Review: TowerPro MG995 servo

These are possibly the world's worst servos, find out exactly why you should avoid these boat-anchors at any cost.

Review: SK90


It's cheap but can it really stack up against other glow engines in the .90 market? Find out in this review.

Review: iMax 9X 2.4GHz radio

How does this cheap 9-channel 2.4GHz radio system perform when compared to big-name systems that can cost two or three times as much? Have the Chinese finally developed a real contender with the iMax 9X?

2.4GHz Explained

Does all this 2.4GHz stuff have your head spinning? 2.4GHz

I've done my best to demystify the whole subject so if you feel like a bit of learning, this is the stuff for you!

Fix That Engine!

How can you tell when your engine needs new bearings? Who has the best prices and service on replacements? Just how do you change them? Get all that information and watch a great video tutorial anyone can follow.

Chinese Servos - How do they stack up?


The Chinese are now churning out a huge number of very reasonably priced no-name servos. But are they any good?

Baffled by batteries?

Batteries Nicad, NiMH, Li-Ion, LiPoly, LiFePO4, A123... the range of different battery types has never been greater. So how do they differ and what type should you be using?

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