This is going to be a long winded answer, Sorry.

So you can change the amount of trim steps in most radio's but regardless if you have 30 beeps or 3 beeps, you still have to move the trim button or lever 100% full up and full down when commanded during the learn process and while you are actually running the turbine. If you have a radio with a manual trim lever, you need to move the lever 100% up and 100% down. If you learn RC using less than 100% throws, you could cause a commanded shut down when you didn't want it to shut down. When you learn RC properly, and if you look at the PW value, it should be around 990 or 0% with trim & stick down, 1100-1200 in the 24-26% range for idle running, meaning trim is 100% up and throttle stick is low. At full throttle with trim up the pw is normally around 1950-2150 and 100%. If you short cut the trim movement and its value is not in the 24-26% range, it will more than likely be in the 8%-15% range. When you are flying and go throttle stick to idle, the ECU could interpret that as a lower trim command and shut off. The ECU is set up for that 25% margin so it clearly knows what it should be doing and when it should be doing it. If you are using Spectrum, all %'s should fall in place. If you are using a different radio system, check our % after learning the RC. If you have a value lower than the 24-26% when your trim is up and stick is low, you need to go in your radio trim set up and adjust your throttle trim % to be in the 24-26% range whether you have to go up or down. You can watch the adjustments on the GSU while you are making changes, to make sure you adjust in the right direction. I hope this helps and is not to confusing.

Cheers,

Dirk

This is very helpful, thanks Dirk!
I can't believe I've been doing this process wrong for over seven years of Kingtech turbine operations! I've always done the learn procedure with the trim up at mid-position, which showed 12% stick at idle. I think, if I remember correctly, the reason I did it this way was because the manual shows 12% at Idle in the pictures?
Considering I've completed hundreds of flights with no flameouts or unintended shutdowns I think I need to go buy a lottery ticket today as I'm feeling pretty darn lucky that I have not inadvertently shut one down in flight! - Tom

Obviously it will work as you have found out. I compare what you are doing to California Motor Cycle riders, it's not a matter of if they are going to crash, its when they are going to crash. You both have been fortunate enough to dodge a bullet, but one of these days the ECU is going to think it is suppose to shut down and it will. Please learn RC the proper way to avoid being a statistic.

Dirk

I got to fly one of my jets (w/K85) after re-doing the learn process correctly. I noticed the idle is rock steady now at 54,700, before the idle would vary between 53,500 and 56,600. Not sure if the improved idle is related to the re-learn or not, it's just an observation. Thanks again for the clarification. -Tom

Or don't use trims at all if you have a programmable radio and set a switch....

well crap, I have been doing the learn process incorrectly as well. Great thread and thank you all for sharing the correct process.