GV-1 with the 14MZ

[EricLarson]

Hi, Thought I would add some info on my setup for the GV-1 here. This came up when I was talking to someone that was working with the new 14MZ and felt the GV-1 was over speeding from time to time and was having a hard time of figuring out what the problem was. He was thinking it may have something to do with the update rate or resolution of the new radio.

Turns out that he tried the same type of setup I am running and the problem vanished. There are some reasons for that, but here is what I do in a nut shell.

When I set the limits in the GV-1 I set the idle one to around 20% on the throttle barrel. I set full to full, and shutoff to the shutoff position.

What that does is prevent the GV-1 from going all of the way idle on the carb. If the Gov pulls the throttle to idle, it tends to overshoot when adding power and you get over speed. Setting the idle to around 20% allows the motor to respond faster and eliminates that overshoot. Also you will experience better climb power and a lot more "pop". Frankly it feels like you have more power.

Using a Gov is the only good way to prevent the over speed that WILL kill your motor when doing 3D flying. I will probably get into this later, but if you tune your motor for a certain RPM then it over speeds it will get leaner. Leaner means more heat and more heat results in and even leaner condition....... end result is a lean and overheated motor. Setting the Gov like above will give you great power and a great running long lasting motor.

Hope that helps some,

[cdrking]

Good info Eric.

Would this also apply to the 9Z?

Jeff

[EricLarson]

Yes Jeff it does. It seems to make a bit of a larger difference on the 14MZ but I use to do this setup on my 9C also.

It is somewhat easier to think about it like a normal throttle curve. We don't set the low point below around 60% or so. The GV-1 set at true idle is only like 7%. Setting it to 20-25% gives you the true benefit of the governor, but also allows it to work with the limitations of our carb's and servos. It is worth a try for those of you with GV-1's that want to see if you can get the best performance possible for 3D flying.

[cdrking]

I'll give it a try. What I've noticed on my setup (9Z) is when I bring it down to land (normal landing). I bring the throttle down and the GV-1 "holds onto" the RPM a long time. I also have been noticing a slight overspeed in some maneuvers as you mentioned.

Does this sound like a similar situation?

Don't mean to hijack your 14MZ thread. :) I am thinking about getting one so hope that counts. :D

Jeff

[EricLarson]

I pretty much always land in throttle hold and the gov is off. Or I land in Normal mode and my gov is also off. I don't run the gov in normal mode at all, and it takes a few seconds for the head speed to stabilize after switching into idle up.

If you use it in normal mode it will have a tendency to do what you are describing. I use my idle up switch as the control for the GV-1. Norm=off, idle 1&2 = 1750, hold = off.

Good questions..... maybe more of a gov thread, but this came up when we where talking about the 14MZ and the GV-1 so I figured I would add it here :)

[johnboy]

Hi Eric, It’ these little tricks that we forget sometimes to tell others. I found very early on when using the GV-1 that the power would surge going from a high load to complete unloading of the disc in near instances of time. With having the full throttle range available to the governor I thought it gave it to much scope to play with. I now always set the idle to just below the bottom of my v-curve (I have a fairly accurate v-curve though). I cannot imagine any more power being available to my YS using any other governor.

Umm, sorry, a governor thread now :)