I have a radiolink 6GS (for my cars, only the best proven tech for valuable fragile boats traveling at high speeds at long range with knife blades attached IMO) and i seem to remember having to change the failsafes from defaults, i dont recall if it defaulted to throttle hold or something silly like that, or it was throttle reversed or partial throttle, but its deffo worth checking that failsafe is on and its set to throttle off on all your models.
Even if the failsafe is set correctly not all failsafes are created equal, when the Spektrum waterproof surface RXs came out there was a marked increase in lost monos in the UK race scene, which with some testing was found to be the RXs not responding to failsafe quickly enough and submaring boats being propelled into the lake bed at full throttle and getting stuck, folks switched back to air RXs and the spate of lost boats was.
A lot of ESCs have a failsafe on a 3 second timer, some throttle cut, some throttle hold. With the early Spektrum surface ESCs they would take longer than that to failsafe, so the ESC failsafe would kick in first, and it wasnt unusual to see a hump or fountain in the water form a boat flat out nose into the bottom, and towards the end of the race it would run out of battery and pop back up to the surface if the bottom was hard enough not to get stuck.
Getting stuck seems to be a reasonable likelyhood in both man made and natural lakes, assuming no hull breach or enough bouyancy was fitted, draagging a reasonably heavy chain with the rescue boat will likely move it enough to unstick it, or worst case if you have a local scuba diving club, they can often be bribed to put on a search with a bottle of something tasty and enough cash to pay for their air fills and petrol.
It's easy enough to check your failsafe, take your shaft out, rev up the boat, switch the TX off, and see what happens, maybe it takes 3 lost servings of data to kick in failsafe but with the Futaba FASST airs I've used for my boats it is close enough to instant that I can't tell it isn't.
Paul Upton-Taylor, Greased Weasel Racing.
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