I am struggling with what to do and am looking for some input. I have a few jets now and want to convert at least one to the new Futaba S-bus. The reason for this is the amount of connections I need to make when I put the jet together. Two of my four jets require at least three servo connection per wing and it would be nice to shrink it down to just one. I am going to attempt it with my sport jet first (Falcon 120) and then maybe the others larger jets.

So here is my problem, I have four servos per wing (ail, flap, elev and rud) and I need to remove the wing to transport the jet. I was going to purchase all new S-bus servos and then use the hub's to connect them. Part of my problem is that the servos can't reach each other and the hubs don’t have pigtails. This maybe a silly question but, can I use std extension to get to the hubs? I addition, the center of the fuse doesn't make it easy to plug into without an extension.

The other option is to use the existing servos and the S-Bus Decoder. A question about this, can you connect them in a similar manner as the hubs? Daisechain one of the lead to the next decoder and so on or do you need to use another hub?

Why wouldn’t standard extension work if you’re using the S-bus servos.

Will the S-bus servos work in a standard mode, connected directly to one of the receiver ports should I want to?

Thanks
Scott

here you go [8D]
http://www.powerbox-systems.com/e/ka...satz/start.php

.

or just order some Ashlok connectors from Dreamworks.

http://dreamworksrc.com/catalog/ashlok-c-59_110_84.html

Ditto what KC said...I'm flying the Tornado which is essentially a falcon and I use the multiplex connectors. Each connector is 6 pin, so your 4 servos in each wing boil down to just 2. Use the male end of one connector for 2 servos and the female end for the other 2 servos. This prevents getting the connectors mixed up. No need to use the S-bus. The other end of the multiplex that has the rudder and elevator servo connects to the boom via regular servo extensions and disconnects from the boom when taken apart

Actually, it can be done with just one multiplex conn., +, -, and four open pins for the four servo signals

True...but not being sure how many amps the connector can handle, I opted for the safe shot

Im a little worried about amp draw through one lead myself but I think for a jet you dont have high amp loads like a large 3D plane that you slam the controls on every axis. I am trying to get info from futaba on this but from what I have found so far Robbe has a great solution.
http://shop.rc-electronic.com/e-vend...&c=1786&p=1786
the sbus powerbox with the hub is a perfect combination, the hub allows for anothe battery just for the servos and has larger lead wires for higher amps, you can even just use the powersystem without the hub. Robbe makes the lead your servos plug in with higher gauge wire. My jet I will be working on soon has tons of servos so using this system will save some weight just by cutting out 50ft of servo wire LOL

I also found this obvious problem with S-bus. Neat system for a trainer, but for most jets you will need external power supply to the servos making the install look like crap again.

I think compareing Jet and 3D is not always fair. A slowflyer jet might not use as much current but if you compare my Baiojet and a parkflyer useing the same HS65HB servos I think it's not obvious the 3D plane uses more power as the Biaojet always is in G-load stressing the servos.

Emcotec do a nice wing connector, 1 and 2 servo versions but again you can gang + and - pins as these have solder plates and seem very robust....

[link]http://shop.rc-electronic.com/e-vendo.php?shop=k_emcotec_e&SessionId=&a=article&Pr odNr=A85087&t=12&c=1948&p=1948[/link]

marcs

Ashlok connector Would be much better than mpx one as the pins are crimped, solder connections can break too easily.

Would not favour the s bus system at all, yes might be nice one connection but also you are relying on one wire to run all your servos and with all the recent trend in jets for powerboxes, dual receivers/batteries etc to increase reliability, to me this is a step backwards in control reliability.

If futaba were clever they would have designed the system with dual redundancy. Not 12 servos on one wire as they demonstrate on their YouTube video !

Don't know if you guys saw this new RX from Futaba: http://www3.towerhobbies.com/cgi-bin...?&I=LXBPKP&P=0

It's a dual S-bus RX, full range three channel. That's all you need with S-Bus

I'm going to run one lead down each side of the plane. In my case I'll have 4 servos on each S-bus port.

My next two projects will be set like this

Hmm i dont know why they would even make something like this unless its for the very reason we are posting. Maybe to split up the load on more than one extension or security?

http://flyrc.com/501111

found this looks like they did this for having two leads for the same control surface, so maybe if you had 4 servos on a large aileron you could put two on each to support the load?

On another forum there is a good thread about power use. It's mostly about GS planes, but there is good information anyway.
It has been stated there that you can loss up to 1/2v for every standard connector.
Robert from Smart-fly told me unless the jet is in the 40lb range standard set-ups are.
What you can do is solder the leads and get rid of the connectors. Dennis
http://www.teamflyingcircus.com/foru...s-planes-6129/

Pardon my question here fellows, but how are you using the Power Box, Smart Fly or any either type of power management system, being wired and still making use of the single conductor system that feeds the hubs? Are you just managing the battery power only? Not understanding. Pictures may help my thick brain.

Thank you
Alan

AKB not sure how to read your question? The Smart fly splits the power. the receiver gets 5v. the servos get in my case 6.6v from the A123. there are no switches in the system. The battery feeds the panel direct using 16ga, wire with deans. The only plug I have now is the one plugging into the panel. The panel feeds power to each servo directly. therefore no voltage drop. Dennis

Best thing since sliced bread

<a href="http://www.intairco.net/products.php?product=Robbe-S%252dBusHub-4.1-fitted-with-high-current-wing-connector">http://www.intairco.net/products.php...wing-connector


http://www.intairco.net/products.php...rent-connector


http://www.intairco.net/products.php...acker-PSS-2018

http://www.intairco.net/products.php...30%7B47%7D50cm<br type="_moz" /></a>

yelp im going to be adding the Robbe Sbus system to my F-14 and F-15, I was going to order from emcotec but they only had two of the hubs for sbus servos? Maybe I should go with intairco, any problems with them shipping to the states?

Talk to Peter, he ships world wide.

I have it in my SM Cougar, FEJ F4 and C Arf Euro, I also have a complete system here ready to drop into my FEJ 1:7 F15 (same as yours) when it arrives in a couple of weeks. Absolutely rock solid, easy to use and just soooo neat. I actually stripped the F4 down after the maiden flights to remove the PB Cockpit and replaced with the Robbe system just because it was neater.


<br type="_moz" />

good to hear, hey Bart do you know if the lado actuators will work with the Sbus, I figured with a decoder it may work since they work just like a servo. My f-14 has the slats and I dont like how the outer servo box cover isnot flat with wing surface it has dome type cover since the wing is to thin for the servo to have a flush cover. [&o] My thought was to use lados for the slat/flaps and a 1 servo for the spoiler on top. May even use servos for the flaps and actuators for the slats.

Please explain to me where this S bus system is the "best thing since slice bread" from what I can see it it the worst thing ever introduced into the model or jet aircraft scene.

For years now everyone building jets has been obsest with big powerful servos and powerboxes with dual batteries and even using two receivers etc, all to increase safety and reliability. And now for some reason Futaba have conned futaba users into thinking it is a good idea to run all the servos on one lead!!! Just Crazy, loose that connection and your plane is dead!
With a normal standard and safe system, if you loose one flap, one aileron, one rudder, one battery etc and you more than likely will get it down wth no issues, but with Sbus it is a crash full stop.

Both the pic and diagram below come from futaba one example even has 14 servos all being fed from one wire coming out of the receiver, this one wire is also giving the power to the 14 servos which is even more mad especially if they are high torque digitals.

Can you imagine when using a standard receiver setup, having 14 servos connected in a multiple amount of Y leads, and then connect all that to one extension lead ! craziest thing I have ever heard.

Now of course futaba tell you you can remotely power the servos by plugging a battery into the hub, yes great idea to put a battery in the tail, really helps with CG does that!

Please someone tell me the advantage of Sbus, yes one servo lead from your wing would be nice but again do you really want to run 4 or 6 servos in a wing on ONE lead and connection ?

Why do so many people think the battery has to mounted right next to the hub?
Why do so many people think that one battery can only be plugged into one hub?

The battery leads can be as long as you like. The battery(s) can be placed wherever they need to be for balance, then you can run heavy gauge wire back to the hub(s).
The heavy gauge battery lead can then be tapped off of in several places to attach to multiple hubs. (think power bus)
I'm thinking I might used one battery attached directly to the receiver to power the receiver and any PWM servos attached to it, then another battery to power all the Sbus servos on the starboard side, and another one to power all the Sbus servos on the port side.

Not a perfect system, but it is still simpler than running long servo leads to each individual servo, and it has some redundancy (much more than I am running on any of my current airplanes), and it doesn't pull high amp loads through the receiver's bus.

I will also be considering the Robbe power system too, since it offers true battery redundancy.

Bart is talking about the Robbe version of the SBus power system, it has all the nice powerbox features but using SBus setup
plus they have another version that is designed more for large 3D planes, a simple hub/power supply.

Fenderbean<p class="MsoNormal">I am actually trying to fit the Lado stuff into my F4 at the moment although I am struggling with room. The Lado works fine with S Bus and only needs the Futaba SBD-1 type decoder.</p><p class="MsoNormal">Xairflyer</p><p class="MsoNormal">I don&rsquo;t feel that this is the worst thing to hit Jet fliers, and I certainly don&rsquo;t feel conned by Futaba, we all have choices.</p><p class="MsoNormal">Whilst I can appreciate your concern of trusting one cable, I think that is only small when compared to trusting the tiny power track on the board of a receiver or the even the battery plug plugged into the receiver. Of course you could use two receivers but you don&rsquo;t get diversity unless you use a Powerbox style system, so then you have to trust those electronics including the single power regulator that supplies power to both the receivers.</p><p class="MsoNormal">Our jets are full of items we have to trust to keep the plane in the air and allow a safe return; the &ldquo;single lead&rdquo; setup is just one of them.</p><p class="MsoNormal">Personally (and because I have a choice) I am extremely happy with my selection of the Futaba S Bus supported by the Robbe/Futaba hardware, it is extremely robust and well thought out. I also have no problems using the standard Futaba system in my 12 kg or less jets.</p><p class="MsoNormal">Before using this system for the first time, I did my due diligence testing (quite extensive) to ensure the product was suitable and that I understood it before installation in my SM Cougar. This testing consisting of 6 x S9074SB servo&rsquo;s (20 kg/44 lb Stall) all cycling at the same time through a full sweep. Each servo was loaded up with a constant 13.5 kg/cm of torque (187 oz/in) and 3 of the servo&rsquo;s were connected to a Futaba 4 way hub (4 way Y lead) that in turn was plugged into a Robbe S Bus terminal/node with a STANDARD servo extension lead. All of this was powered by the Robbe battery backer that displayed actual current draw.</p><p class="MsoNormal">There is a very grainy (bad upload I guess) You tube video http://www.youtube.com/watch?v=MhkRT...p;feature=plcp of the functioning and shows the actual current draw of each battery. Total draw was 15 amps which means that the standard extension lead was carrying 7.5 amps, this was the limit of the standard servo extension lead as after about 5 minutes of continuous operation the 3 servo&rsquo;s started to slow and struggle, but let&rsquo;s face it our jets don&rsquo;t see load like this, they see intermittent peaks except maybe the flaps. If you&rsquo;re not sure about the load relationship, sit a 20 kg mass on your elevator in line with the elevator horn and operate the servo, I reckon the mechanical structure of the elevator will fail before the servo stalls.</p><p class="MsoNormal">Anyway, personal choice is just that. As an experienced modeller, you need to build to the absolute best level you can to ensure safe flying, if you feel there is risk using the S Bus system then stay with what you know works and is reliable.</p><p class="MsoNormal">Fender, have sent a PM with some other info.</p>