What FrSky receivers you using - RC Groups
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Oct 16, 2017, 02:28 PM
Registered User
Discussion

What FrSky receivers you using


So what's your favorite FrSky receiver that you like to use in your fixed wing planes? Just picked up a carbon edition Taranis X9D radio and am looking for receivers. I've got a mix of E-Flite electric foamies, a big 1/4 scale cub, 10cc Cessna 182, soon to have a Seagull 91 Super Decathlon, and a 1/5 scale P-47 that is going to require 13 channels if I want to set it up properly. That plane is the reason I picked the Taranis to begin with. I fly Spektrum right now but didn't want to drop a grand on a radio to get the number of channels I need for it.
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Oct 16, 2017, 03:23 PM
Sagitta Fanboy
I tend to use a lot of X4R's and X8R's, but I'm switching from the X8R to the easier to install G-RX8. That's mostly in gliders (X4R for RES, X8R/G-RX8 for Full House).

Remember, all SBus-capable receivers output 16ch on SBus.

That said, for your P-47 I'd use a RB with an X4R-SB as primary and an XM+ as secondary, with two RX packs feeding the RB. That gets you redundant power, redundant receivers and fused servo outputs (so a single servo failure can't bring down your aircraft).
Oct 16, 2017, 03:29 PM
Registered User
Quote:
Originally Posted by mawz
I tend to use a lot of X4R's and X8R's, but I'm switching from the X8R to the easier to install G-RX8. That's mostly in gliders (X4R for RES, X8R/G-RX8 for Full House).

Remember, all SBus-capable receivers output 16ch on SBus.

That said, for your P-47 I'd use a RB with an X4R-SB as primary and an XM+ as secondary, with two RX packs feeding the RB. That gets you redundant power, redundant receivers and fused servo outputs (so a single servo failure can't bring down your aircraft).
I'll probably end up having three battery packs on the plane. 2 for receiver redundancy and a third for the CDI ignition. Can you post links to what you're talking about? I'm having an issue finding them.
Oct 16, 2017, 04:03 PM
Sagitta Fanboy
The FrSky RB is here:

https://www.frsky-rc.com/product/redundancy-bus/

The X4R-SB is here:
https://www.frsky-rc.com/product/x4rsb/

The XM+ is here:
https://www.frsky-rc.com/product/xm-plus/
Oct 16, 2017, 04:18 PM
Registered User
Quote:
Originally Posted by mawz
I have an X4R SB and an XSR that came with the radio. But they look so puny, like they are made to work with the flight controller on a quad and not have a bunch of servos hooked up to them.
Oct 16, 2017, 04:38 PM
Sagitta Fanboy
Quote:
Originally Posted by Assocracer
I have an X4R SB and an XSR that came with the radio. But they look so puny, like they are made to work with the flight controller on a quad and not have a bunch of servos hooked up to them.
Your servos all plug into the Redundancy Bus, the X4R-SB and XM+ (or XSR bound non-telemetry) just provide the SBus feed with servo data to the Redundancy Bus, which handles the power distribution and decoding 16ch SBus to 16 servo outputs.

The X4R-SB will run 3 servos + 16ch over SBus, the XSR (and XM+) just output 16ch SBus.
Oct 16, 2017, 04:43 PM
Registered User
Ok, this is all new to me. I'm coming from Spektrum so I don't totally know how the SBus stuff works. So if I were to run the XSR what would I need to hook up servos to it?
Oct 18, 2017, 02:27 AM
Registered User
Quote:
Originally Posted by Assocracer
Ok, this is all new to me. I'm coming from Spektrum so I don't totally know how the SBus stuff works. So if I were to run the XSR what would I need to hook up servos to it?
Another receiver or SBUS servos. The SBUS only receivers are meant to be used on quad (flight controllers) or redundancy / power-boxes.
Oct 18, 2017, 10:36 AM
Registered User
Quote:
Originally Posted by Tadango
Another receiver or SBUS servos. The SBUS only receivers are meant to be used on quad (flight controllers) or redundancy / power-boxes.
They make Sbus servos? I can't imagine that servos like that would work very well? Not enough current going to them to be able to move surfaces on anything much bigger than a micro plane?
Oct 18, 2017, 11:09 AM
Registered User
Quote:
Originally Posted by Tadango
Another receiver or SBUS servos. The SBUS only receivers are meant to be used on quad (flight controllers) or redundancy / power-boxes.
I see this now. One of the points of going to Taranis is the price point. Those SBus servos are stupid expensive.
Oct 18, 2017, 01:02 PM
Registered User
Jup, that is why sbus servos are very rare
Oct 18, 2017, 01:47 PM
Sagitta Fanboy
Quote:
Originally Posted by Assocracer
They make Sbus servos? I can't imagine that servos like that would work very well? Not enough current going to them to be able to move surfaces on anything much bigger than a micro plane?
Sbus's power bus can be whatever you need. Nothing stopping you from running 18-20ga wire and feeding from a 2s Lipo, allowing very high current draws)

What Sbus servos allow you to do is to run 3 wires across a wing, controlling 4+ servos.

And FrSky's SBus servos are reasonably inexpensive (compared to Futaba's).
Oct 18, 2017, 01:48 PM
Sagitta Fanboy
Quote:
Originally Posted by Assocracer
Ok, this is all new to me. I'm coming from Spektrum so I don't totally know how the SBus stuff works. So if I were to run the XSR what would I need to hook up servos to it?
The Redundancy Bus.

The XSR feeds the RB, the servos plug into the RB. The RB handles the mapping of SBus to standard servo ports.
Oct 18, 2017, 04:22 PM
Registered User
FrSky also make very "normal" looking 6 and 8 channel receivers at attractive prices.
Oct 18, 2017, 04:43 PM
Registered User
Quote:
Originally Posted by teamdavey
FrSky also make very "normal" looking 6 and 8 channel receivers at attractive prices.
Oh I know that, I've got some coming. I was just wondering what others were using is all. Like I said, I'm knew to the FrSky stuff. I like how user programmable it is, but it's a little more difficult to figure out how to do it. They don't hold your hand thru the setup process like Spektrum and Futaba do, but there is definitely a lot of YouTube videos on it. I haven't really gotten a chance to set up the radio though as I don't have any receivers to put in any planes yet. I'll have to wait till Friday night when I get home from work and hopefully have a couple in the mail by then. My ONLY concern is leaving the fate of my irreplaceable Bert Baker P-47 to a $200 radio


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