Hi. I have tried an Acoms 27Mhz RC and a 2.4Ghz RC both do the same thing. I have given up with Mtronik. it looks like they have buried their head in the sand maybe because they do not know. So moving forward I am going to build
my own speed controller
based on an article on www.pt.boat.com.
For what it's worth this is what I sent to Mtronik:
"Sorry but this made things worse on both Viper ESC the 25A and 40A have the same problem so does my cheep Chinese Import.
I have set them up on my bench now with the digital scope coupled up to confirm what is happening and have come to the conclusion there is something in the software causing the problem. This is my test method. Two 6 Volt gel batteries
coupled in series feed the main power to the ESC. A separate 6 volt supply powers the servo
tester. A 4 Watt 12 Volt bulb is connected to the ESC output (this is to give load and make sure there is no EMC) The servo
tester is giving out 0.945 to 1.926ms with centre off around 1.452ms. At 1.087 and 1.85ms the ESC's output switch
es hard off and on. This is what causes the flickering on the bulb. All that happens when I use the left or right mid point to set the travel is the problem moves in proportion. Which makes me think it is a software glitch. Would it be possible for you to set this up and replicate it?"