No – certainly not with a 2G4 radio.

DM

You apply RFI suppression to protect your own boat against interference, AND the boats of anyone who is sailing close to you. Some of these might be on 40 MHz, or indeed, 27Mhz, if they are toys…

However, if these are tiny motors, any radiated interference is likely to be minimal, especially if they are low volt and low load. And I suspect that someone would have to sail quite close with a susceptible boat to be affected. And if they were, once you sailed away they would be OK. And most sets are 2.4GHz nowadays anyway.

So Dave's advice stands…

Ancillary motors are often on a different circuit to the main system – perhaps with different batteries and a relay switch – but your point is perfectly correct for any connection that can put spikes into the ESC. Cheap Chinese ESCs are often very vulnerable to such interference. I would guess that DM's Action electronics is much more robust!