Have a Jive 80+HV back in my TDR and I have telemetry working but I am getting too low rpm readings. I have experimented with the gear ratio settings in an attempt to get ball park values and ended up with a setting of 4,75. I am running a Pyro 30-12 510kv (10poles) and a 14T pinion. The 2 stage drive on the TDR equates to a 160.65 tooth main (according to Mr.Mels calc!). 11.75 gave really low rpm values. At gear ratio set to 4.75 I get approximate rpm at 60% throttle (ca1400rpm) but when switching thru 70% and 80% settings the displayed rpm does not seem to match the actual rpm. I get a small increase between 60 and 70 and a smaller increase jumping from 70 to 80%. The audible increase in rpm sounds way greater than the change I see on the tx. I had a Kosmik in the heli just prior and all the telemetry was spot on, rpm and all. Did not need to set anything in the software. I wonder what I am doing wrong!
The Jive is set up in mode 1 and then 4 before setting up.

I realise I made a mistake with expected displayed values. I should be in the region of 1600 rpm at 60% throttle on the Jive gov. So my readings now are too low. But gear ratio set to 11.7 I was getting around 700 rpm. It is too late to make noise now but maybe 11.7/2 is the answer?

Tried using half the gear ratio. No luck


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Are you setting the values in the spirit unit or tx?

It is very strange. Maybe you can try it with blades on.
Do you see that RPM is linear from the beginning? So that it starts at 0 and is going to desired RPM?

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Spirit System developer

That´s a common problem of the Jive ESC´s. It´s probably the way how the Jive commutates. I have a similar problem with my Jive 120. With 1200 rpm I get around 1500 rpm displayed and the value is jumping too. With 1500 rpm on the head I get the correct value. What RPM sensor are you using?

Have done a little reading up on the old Jive. I have been running a Kosmik in the TDR for the past two years and have not owned a Jive for a good few years. I forgot that I should set the Jive up for max desired rpm at about 65% throttle as opposed to 80% throttle on the Kosmik. That explains why the rise in rpm was rather smaller than expected when I was setting up, without blades besides.
I still dont get why the rpm reading I am getting are so low. I started with default values, all in the Spirit software. Sensing at 5 for the Pyro 30-12 and ratio 11.47.
I will revert to these settings again and note what readings I get.