PLEASE help finding solution for Rx redundancy with gyro while using Sbus OUT.

[dsmithwc04]

I have spent 20+ hours over the last week and a half trying to find a solution to my problem. I have found some ways to make it work but I wanted to make sure the community agrees with the direction I'm going and if there aren't more efficient ways of finding a solution. My plan is to use only single wire SBUS connections from the plane MFC to gyro(or FC ) then to R-SXR then to a slave rx such as XM+.

I use a TX16S along with FrSky Rx's. Currently I use S8R's and love them but I am setting up a rather expensive HSD F16 105mm S-EDF and want redundancy. This HSD incorporates an MFC-2085 that powers servos, lights, landing gear and brakes and is totally separate from the 12S power system for the ESC/EDF. The MFC also has the capability of getting signal to the servos/leds/gear via PWM or SBUS. I would love to incorporate GPS RTH Failsafe but this is not a 100% necessity . I was at first looking at incorporating a FC such as Pixhawk 4 because it has an SBUS OUT and would minimize wiring to provide a clean install plus I could use a GPS for RTH Failsafe in the event of signal loss and a case where the plane might have been heading away from my location and out of my life forever then the GPS RTH might at least give me a chance of recovering my jet.

At that price point I figured I might as well jump up to the Durendal since it jumps from the F series to the H series FC and also takes up less real estate. Now we are talking $260 plus shipping if we are including the GPS which then also includes the better PDB. I really am not wanting to spend $290 with shipping at this point.

Looking at the Matek FC boards I don't see where they have SBUS out so those are out of the question as well.

Anybody have any other considerations?

 

[Nigel]

It's your personal preference, but I think your best bet is to try and keep things as simple as possible, hopefully leading to fewer points of failure. If you're worried about failsafes, you can save yourself a lot of time and trouble by running 2.4 as your standard control, and then a 900 MgHz system for redundancy. This will almost guarantee no signal loss if you orientate and mount your antennas correctly.

 

[dsmithwc04]

Nigel, thanks for the recommendation. This has crossed my mind as well. I just hope FrSky comes out with an ACCESS module so I can use an SR8 PRO and have gyro with redundancy all in one.

If I were to go with 900 mhz, will an external module work fine and how quickly will it kick over in redundancy mode? What Rx's and module are recommended? Thanks!

 

[Wayne]

What you are wanting to do will end up turning you into a system integration engineer. You will spend far more time setting up and testing than actually flying. Chances of a run away will actually be higher.

If you want to do all of those neat things I highly recommend you install it into a junky airframe you don't care much about and start the learning curve with that. Once you have mastered the system, then you can install it into a airframe you love. I will suggest the same for most anything that is complex or brand new to you.

It also strikes me as a bit odd that you want to go down all of this added complexity, but you picked a Jumper radio as the heart of the system. They have made some interesting quality decisions on those radios. Fine for the foamy stuff, but not suggested for higher end IMHO.

Hope this helps..

 

[Nigel]

Yep, and external module would be exactly how you'd do it. In terms of switching, it would be as quick as the 2.4 receiver can identify enough packet loss to classify as a failsafe. The 900 module and receiver are constantly communicating the same information your 2.4 module would be, it's just not being used. Depending on your application, Crossfire or R9M would suit your needs just fine. If you aren't planning on super long range or an extremely high-end model, R9M should work just fine.