That certainly seems to be a good simple system, even I can follow it.
Cheers Colin.

Sorry I thought you had produced a new version.
I have produced a couple of diagrams which indicate what I believe are your requirements. I have not added the fuses and switching units as this is a personal choice.
I use Ubecs and they can handle up to 6amps which is more than adequate for a few servos and escs.
I suspect your smoke and sound units are 12v so should be OK of the 12v battery.
As regards a common earth (-ve) connection between the two systems I would not connect the two systems 12v and 24v in any way. My main concern would be the internal connections in the ESC and S1 to earth. As each battery performs different tasks, and I believe you know to keep the high current from the signal wires, I cannot see how you could use a common rail to any advantage.
I may have this wrong in which case please let me know so we can discuss further
dave976

Colin,
The motors run on 24 volts and I am series wiring two 12 v batteries to supply the 24V. The 24 V pos (red Lead) from the battery goes to a junction block(not labeled), then thru telemetry modules to the ESC's and hence the motors.
cheers

I am trying my hardest to follow this but am greatly confused, from sketch supplied the motors have no positive feed?
I thought I had a basic grasp of electrics , but it looks a bit over complicated. KISS, I was taught.
Especially with modern radio systems with multiple channels being programmable.
Baffled oldy, Colin.

Wonderful idea! I had not considered that. Thank you!

ToraDog,
To handle the different currents, still connect the Ground bus to the battery common, and designate one side of the hull as the high current side return, and the other side the low current side return.

Good Luck

Daave,
Scroll down to my early post for the block diagram.
I thought about using SBUS for all the extra channels, but I had the receivers and I like the redundancy of multiple receivers. I use this set-up in my other models and am happy with it( ie, I am a dinosaur and slow to change).

That's great. No block diagram attached??
Interesting to see you are using the Sbus and am wondering why you are not just using I rx and sbus which will allow for multiple channels in addition to the 6 or ten on the rx. I will draw up a diagram from this info and we can then discuss how this meets your requirements.
dave976

Dave,
I'll try to answer all your points. I expect to use at least 3 receivers, but 4 are possible. This will give me 8 channels/receiver. I'll KISS it as needed. There are two drop down converters planned, 12 to 6 volt, and 12 to 3 volt. Again, as needed. The radio will be powered by the house 12V via 10 amp BE/VR's. Each of which can power 2 receivers. Depending upon the servo amp loads will determine the # of BE/VR's used. The ESC's are from Modelbau-Regler in Germany. I have use these numerous times and find them to be very reliable, absolutely silent and easy to program, when needed to be.They are 12-24 volt, 60A constant, surge to 100a.
Smoke units will be the oil type(Harbor Models) which draw about 2A max each. I have not fully decided upon the sound systems yet, so specs are in the air.
I attached a rough block diagram to my earlier post.
The V/A telemetry module are FrSky. They report voltage and amps used and the accuracy can be user selected. The connections are very simple. It series installs in the Pos and Neg leads from the battery. It then connects to the receiver via the SBUS and the module can be daisy chained together, they can be combined with other modules as well, ie, GPS, Altitude( although I do not expect to need that one😋). The radio will allow many modules to be used. My current thinking is one per motor, and one for the house battery draw.

Hi Tora Dog
Interesting project and one that requires some careful planning for the electrics. I can understand your desire to keep the wiring to a minimum but you also need to consider the Radio and ESC signal wires and the need to keep these separate from any high power equipment wires.
It would help if you could advise the specs of motors you are using and the ESCs ( Voltage, max current and/or wattage). I am unfamiliar with the V/A tele module so some general info and connection details would be welcome.
I am intrigued that you intend to use 4 receivers but believe we have discussed this on another post in the past, but 4 would seem to be a lot.
The aux items do not seem to be high current apart from the smoke generator which in my experience need its own direct fused/switched battery supply if using the heated coil. If it's the mist variety and needs 24volts the power use is not that great.
I believe you could achieve the same results with far fewer drop down converters than shown, unless you are following warship redundancy duplicated circuits?
Perhaps you could draw some block diagrams of each component and indicate its purpose and how it is to be controlled ie
Motor- battery ??v powered -controlled by ESC fed from ??v battery and Rx 1 (say) used to drive the prop.
With this info it would be possible to draw up a series of units and then decide how to connect them all together.
Good to see you are planning before starting to install and hope we can help further
dave976