Trying to calibrate my throttle from my X9D Plus with my ESC in a fixed wing.

Using a R9MM Rx and Matek F722-Wing FC.

I noticed in my OSD that my full throttle position was showing 88% in both fixed wing platforms using same hardware.

I calibrated the Transmitter which was pretty straight forward. Afterwards I had to make some adjustments in the output settings to put everything to 100 percent.

All control services are fine and aligned properly, but the throttle has to be moved about 35-40% up before the motor spins.

In INAV I tried to use the calibration technique and it has done nothing.

I set the master to 100%,  moved the throttle position to full throttle, plugged the battery in, and then moved the master in INAV to 0% along with the throttle and nothing changed.

I noticed when I plugged in the esc that it had a series of one-long beep, followed by a single-beep, and then one-long beep followed by two-short beeps, and so on until it went to four of them.  I'm assuming that is for two to four cells.  Not sure.

Anyway, appreciate any advice.

I am assuming you are using iNav to control the throttle. I believe inav is just like BF. There is a setting call "min_check". The default value is 1100 in iNav. You can lower that value 5 to 10 above your lowest throttle stick value. If you set up your throttle stick properly, then the lowest throttle value should be 1000. So change min_check to 1005 or 1010. You motor should spin up sooner with only a little bit of stick deflection.

Edit:I meant to say above and not below. I corrected in the post.

Voodoo,

Thanks for the reply.  I'm not sure I have done any of this the right way as far as setting up my throttle in INAV.  BTW, I'm using INAV 2.4.0.

My trim setting on the Transmitter is dead centered.

My output page on the X9D Plus shows -100 and 100 on the throttle with 1500us

There are no subtrims set.

My input page is Thr 100 on Ch 3

On the Channels monitor page:  CLOSED throttle is -98.7 and FULL throttle is 100

In INAV:

min_check = 1100
max_check = 1900

min_command = 1000
nav_fw_min_throttle = 1100
nav_fw_max_throttle = 1850

On the INAV page of Advanced Tuning  in the subsection titled, "FIXED WING NAVIGATION SETTINGS":

Min throttle is 1100
Max throttle is 1850

I set min_check to 1005 and also to 1010 as you suggested and I didn't see any difference at all trying either setting.  As a matter of fact, the FC would not arm with the min_check less than the min_throttle.  After I changed min throttle also to 1005 or 1010 it would arm, but still not difference on the stick movement.  Nearly half throttle before motor spins.

You had mentioned if my throttle stick positon were set up right that 1000 should be the lowest setting.  I think it is if I'm looking at this correctly, because in the outputs of INAV, when I look at the throttle movement is shows it starting out at 1000 and maxing out at 1850 on the bar chart as I move the throttle stick on my transmitter. 

The motor sounds like it is putting out at the max of 1850, but it does not start to spin until about 1225 on the bar chart in INAV as I move the throttle up.  It's about one to two clicks under half throttle on the actual transmitter.

As far a the transmitter calibration, both sticks appear to be centered perfect when I look at the diagram.  The "X" is dead center on both sticks after I calibrated.  Neither stick was centered exactly before I calibrated.  The trims are all dead centered as well.

When I try to calibrate the ESC through INAV, the ESC doesn't play a tune per se, it just has a series of beeps, which I think is simply indicating the cell count.  It's one long beep by one short beep, then one long beep by two short beeps and lastly one long beep by three short beeps, and then it starts over again and again.

Really stumped on this one.

When you go to the receiver tab, turn on radio, tell me the value of the throttle bar when the stick is at the lowest position and the highest value? Also, what ESC protocol are you using?

Voodoo,

The RX tab settings in INAV are 992 at closed throttle and 2011 at full throttle.

I don't know the protocol on the ESC. It was part of a PNP Stratosurfer from RMRC. There website says 40A 2-4S with 3amp BEC.

I know that's not much help, but it's there name with no specifics.

EDIT.....................

I did some research through Google and it appears they ship the replacement ESC for this plane with a Flycolor Flydragon. I have no idea if that's the one mine has. It is a project to get to it. It's buried in the bottom of the fuse below the flight controller and a bazillion wires. If you think I need to pull it out to get the exact info, I certainly will.

Thanks, again!

So the Flycolor Flydragon will only use PWM as the ESC protocol. What is your procedure when you try to calibrate the ESC? Do raise the motor slider all the way up, then plug in your lipo, wait for the tone, then lower the slider all the way down and wait for the second tone?

You endpoints are a little off. You want to change the - 100 and 100 throttle output in your radio until the iNav endpoints are 1000-2000 instead of the 992-2011.

Voodoo,

Yes, I raise the slider all the way up and then plug in the battery and wait for the tone.

There in lies my first problem.  I don't get a tone per se.

I get a longer beep followed by a shorter beep and immediately a longer beep by two shorter beeps, and finally a longer beep by three shorter beeps.  If you do nothing other than leave the throttle at full, the process just repeats.

So, I tried raising the slider, as soon as the first long beep, followed by a short beep ended, I pulled the slider back down and the series of beeps just stopped.

I then unplugged the battery and plugged it back in.

I tested the transmitter and there was no change to the throttle.

So, i tried this at each point of the beeps including waiting until the last series.  Still not different.

I will definitely adjust the radio setting to align the RX settings at 1000 and 2000.

I hate to bug you anymore with this mess; it's just an odd deal with the ESC.  The plane flies fine as it is, I was just wanted to get my throttle the way it should be.

You want to wait for the tines to stop. Remember that you have to toggle the "I understand the risk". Anyway, here is a video.

Once you calibrate and get the endpoints corrected, you want to set the min_check to 1005 or 1010. You should be able to arm without dropping the min_throttle. Min_throttle should be left at 1100. We can talk about min_throttle later.