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**Steve** · 11-12-2006, 10:06 PM

I had the same quandry on Transmitters earlier this year - went for the JR 9xii with a 2700mAh battery pack and synthesised module. It was the most expensive of the choices, but just has by far and away the best feel about it.

The Tx feels solid and well made in your hands - the sticks are silky smooth and positive.

The Futaba feels like a childs toy, lightweight and plasticky.

That's what made my final decision - just the feel of it in my hands.

They are very similar in what they do, they just do it differently.

**Ade_Law** · 12-12-2006, 12:53 AM

pick one of these futaba 7c, 9c or JR 9x2

this might help the decision some what, scroll to the bottom.

http://www.flyingaid.co.uk/infobase/electronics.asp

for electrics your better to go with a hyperion or schulze rx the 146 is very narrow band and can have range issues in noisey environements like electric helis.

Ade

**David Drew** · 12-12-2006, 08:56 AM

Ade, your quote...

for electrics your better to go with a hyperion or schulze rx the 146 is very narrow band and can have range issues in noisey environements like electric helis.

Ade, a pal has one of these 146 PCM in a Trex..keeps it close at present as he is still hovering, but is he in for trouble later. What sort of range in a Trex?

Thanks

David

**Smoothound** · 12-12-2006, 09:21 AM

Originally posted by David Drew View Post

Ade, your quote...

for electrics your better to go with a hyperion or schulze rx the 146 is very narrow band and can have range issues in noisey environements like electric helis.

Ade, a pal has one of these 146 PCM in a Trex..keeps it close at present as he is still hovering, but is he in for trouble later. What sort of range in a Trex?

Thanks

David

Not sure what Ades take on this is and I've never used the 146PCM Rx but you are highly unlikely to fly a Trex out of range (unless the Heli is particularly electrically dirty) due to its size.

I've not used a Hyperion Rx either but I now leave the Schulze stuff pretty much alone after numerous glitching problems that were solved by fitting another different RX. I do still have one in a Trex though and that particular one seems fine. They are particularly fussy about Xtals and although a lot of places will say you can use other Xtals you are better off waiting to get a Schulze one.

One Rx I've been using a lot recently is the Jeti MPD range, cheaper that the Schulze's and in my opinion far better as they appear particularly happy to work in close proximity to ESC's in small wings etc. I also use one in my Mini Blade glider and there appears to be no range issues even though it has a half length park flier aerial and I'm flying on a known dirty slope

**Toby Heli** · 12-12-2006, 09:25 AM

Thanks for the info Guys its nice to see a friendly site with free flow of info

So it looks like the Hyperion, Jeti or Shcultze with the JR FF9 Mk11.

Just need to know what servos to use with those receivers AND what one to use with the gyro....I am still learning but want to buy decent to avoid glitches etc.

I have been looking at flight power batteries with their charger and charge through balancer...any thoughts (Ade, Smoothound and Ashley are not allowed to argue over tests etc.)

**Smoothound** · 12-12-2006, 09:35 AM

Originally posted by Toby Heli View Post

I have been looking at flight power batteries with their charger and charge through balancer...any thoughts (Ade, Smoothound and Ashley are not allowed to argue over tests etc.)

This is one I'm staying well clear of

As long as you are sensible with your packs you should get reasonable life out of them I'd just steer clear of the really cheap stuff. ThunderPower, FlightPower or Kokam will be fine, the former 2 fit the Trex frame a bit better the latter has a better life expectancy but is dearer. It's up to you. Cheap Lipos are fine in less demanding applications but not in a Trex

**moyesboy** · 12-12-2006, 09:54 AM

Sounds like you haven't yet made up youe mind re the Tx as you name the JR FF9, the FF9 being Futaba

There are lots of people using the 146i in their trex, eg Leebert (here) and Jason Krause. The Hyperion is seeming to come out better than the Shultz, the Hyperion has been rebadged as Sexta.
Best ESC is the Jazz (lots of dosh), followed by the Quark 33A (more complex to set up but 2/3 the price).
The Jazz BEC will run off 4 cell packs, but all othe ESCs need a separate BEC to run 4 cells. Most ESC BECs will run off 3 cell packs though, which is what most trexs run on.
4 cell give more power without everything getting too hot.

There is a choice with the packs. The Flightpower may give more power but will only last 100-130 charges. The Thunderpower is supposed to have better construction than the flightpower and might last a bit better but the cells inside are the same as flightpower. The C ratings of the packs are often exaggerated.
The more expensive kokam packs are good for 300+ charges, especially if you use their cellpro balance charger.
This is less cost per flight, as long as you don't damage the expensive lipo in a crash! The manufacturers other than kokam have tried to maximise power rating at the expense of lifetime it seems.
There is a lot of info about these small electrics on a specialist forum run by Ashley Davis. I'm not sure of the etiquette of plugging other forums on here?

**marktigere1** · 12-12-2006, 09:58 AM

If its any help,

I have a Trex 450XL CCPM with 146 PCM rx, Flightpower 1800 and am about to purchase a V-balancer.

Not had a problem with the 146 but my flights have been limited due to the weather although I have the plastic Trex with no metal so cannot comment on its suitability in the SE.

The Flightpower battery has been fine so far although I limit to 8 mins flight time.

From what I have read the V-Balancer should do exactly what it says on the tin. ( I hope).

Cheers

Mark

**David Drew** · 12-12-2006, 02:26 PM

We've just both put PCMs on our Trex & Swift, (146 & 138 resp) both of which were guaranteed to glitch with PPM,(the Trex several times per hover and quite violently) but so far not a single event on either. We'll see as we get them further away from us, but I can see the theory that range will only become an issue when it is way off in the distance...which is not a problem just yet.

So far so good with the PCMs.

Interesting comparisons about Kokam v the rest. Must look into them some time. Being new to all this I thought Flightpower had the reputation, just shows what marketing can do to "big up" a product.

Don't mind the "debates" on products.......you guys just keep slugging it out & we'll watch & learn.

The V balance certainly appears to do what it says on the tin. Quite impressed so far.

Thanks all

David

**Toby Heli** · 12-12-2006, 03:17 PM

Originally posted by moyesboy View Post

Sounds like you haven't yet made up youe mind re the Tx as you name the JR FF9, the FF9 being Futaba

?

Oops.

..made a mistake there I meant to say the JR.

I think now I have all of the required answers (thank Guys!) APART from:

What servo to use with the GY401 and what to run in the rest of the TREX..assuming one of the RX mentioned above (i will look at prices and availability)

**Smoothound** · 12-12-2006, 04:46 PM

For cyclic Hitec HS56 or HS65

For tail Hitec HS56, HDS577/877, JR3400G or Futaba 9650

There is a new Futaba tail servo that is cheaper but it's ver basic and feeble looking and in my opinion it won't last for long...

**Toby Heli** · 12-12-2006, 06:01 PM

Originally posted by Smoothound View Post

For cyclic Hitec HS56 or HS65

For tail Hitec HS56, HDS577/877, JR3400G or Futaba 9650

There is a new Futaba tail servo that is cheaper but it's ver basic and feeble looking and in my opinion it won't last for long...

Thanks Smoothhound! -

I assume the Hitecs would work with all the receivers and the JR TX...? Do I need certain ones for PCM etc?

Sorry for all the questions but about to have a bit of a spend and want to get it right.

**moyesboy** · 12-12-2006, 08:38 PM

The HDS577 from Ashtek works well with the GY401. The HDS877 is a bit weedy and can burn out - thats for the even smaller helis. The Futaba may be slightly better and costs a bit more.
If you use the hitec for the tail use the carbonite gear one, not metal as they actually wear faster and the tail is giving it some all the time. The HS56 and the HS65 are the same but for different mounting lugs I think. The digital ones will perform better with the gy401.
All the servos work with all the receivers (pretty much). Digital servos are not all compatable with all Gyros wjhen the digital output is switched on, so check that before you switch the gyro to digital output (GY401 and HDS577 is fine, GY401 and futaba digital obviously OK).

Dave
No doubt that the PCM will be better than a single or dual conversion PPM Rx, the debate is between PCM and the DSP PPM Rx, like the schulze and the Berg (or Berg technology). These are the PPM rxs that analyse the signal and have failsafe capability.

This is JK's TREX. The 146iPCM is right on top of the Quark 33 ESC. This would definitely not work with my Hyperion DSP Rx and Titan 30A ESC. normally you separate ESC and Rx as far as possible. The quark has a reputation for giving out very little noise, but JKs 146i PCM RX must be pretty sound too.

...ooooh I though that pic would automatically downsize. sorry!

**David Drew** · 12-12-2006, 09:28 PM

PPM - PCM I understand, but DSP PPM....now I'm lost.

But, keep the info coming...the answer is in there somewhere

Thanks all

David

PS Now I see the "big picture"

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Futaba VS JR (for Trex)

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