Talon 25 Setup Question

[3D Dave]

So I have a Talon 25 that I set up in "Set RPM" Gov. mode.

I'm using it with a micro uBrain 2 but NOT using the uBrain gov.

I have 3 headspeeds set of 3800, 4100, and 4300.

Below is a screen shot.

My issue is that I'm not getting an RPM increase in idle up 3.

These are not tached yet but I can tell that idle 1 is slower than 2 but I hear no increase when switching from 2 to 3. In fact, I hear a faint pulsing noise from the motor in idle 3 as if it's not even keeping 4100.

What is weird is that while checking setups, I did at one point have all 3 speeds (audibly) but after some more plugging and unplugging, I'm back to only 2 different headspeeds (idle 2 and 3 sounding the same speed wise but 3 not 100% constant speed).

Radio is original DX7 (JR inside)

Does anyone have any ideas as to what's going on?

[e92.M3]

Hi Dave

What heli is this? What are your gear counts and motor? And also if you can post a screen grab of the "Motor" tab. Just to complete the pic before i comment.

[acrow]

The 3rd headspeed (idle up 2) only cuts in when the throttle curve is at 100%. To ensure that the ESC sees full throttle at 100%, I suggest you check/reset the throttle endpoints.

Regards

Acrow

[3D Dave]

Ok. Here's the screenshots from the Castle Talon 25.

The heli is an Oxy 2 with Lynx EOX 1611 5500kv motor on 3s: (https://www.lynxheli.com/product_inf...ducts_id=26486)

Pinion is 11t
Main gear is 112t

Throttle set in TX 30%, 70%, 100%.

If you and acrow don't see anything, maybe I'll try resetting the endpoints then.

[e92.M3]

Hi Dave

If you're using the Straight tooth gear the count should be 113 and if the Slant the count's 110. Anyway here's Mr Mel's calc results:





First one's based on 112 count and the second on the 113.
Based on these, looks like your selected rpm's were too low for your selected gearing. If you click the "Info" tab beside the rpms while on the Throttle screen, CC will tell you the same. For 30% rpm's should be around 4600-4800, 70% around 4800-4900, 100%'s around 4900-5100. Play around those numbers and click "Info" tab after every change and CC will tell you if you're within the esc's parameters.

[e92.M3]

If you want to use the rpms you originally posted, you have to use 10t pinion on the 113 straight gear:



For background, i got 3 Oxy2s all with Talon 25 driving the 1911 motor using the Slant gear. Never tried the 1611 motor nor sure if there is a 10t straight pinion gear.

[3D Dave]

I'm not worried about running those exact headspeeds.

I just want to run the lowest I can with the 11t pinion. The main gear is the straight version and I'm almost positive it's 112 teeth.

I do recall seeing in the MSH Brain software that my high throttle was at 103% and could have sworn I had previously set it at 100% (endpoint adjustment) so changed it to 100%

I'm now wondering if that's why I'm not getting 4300 in idle 3. I'll try changing it back to 103 tonight.

[e92.M3]

Here to verify: Oxy2 Main Gear Straight Tooth Anyway, the difference is not that much. Just bought these few days ago during BF just for stand by replacements. Also got a couple of sets of straight pinions.

You might be right, it could be the endpoints. I'm not particularly familiar with the uBrain but as far as CC esc is concerned it's recommended to always calibrate the radio's throttle endpoints with CC esc prior to settling in the final target rpms.

Of course, you can do what you think it's best for your situation but for CC specially on the smaller units, they don't particularly play with improper gearing. 1k difference to what is recommended is just a bit far out for esc longevity and efficiency.

[acrow]

Originally Posted by 3D Dave

.....
I do recall seeing in the MSH Brain software that my high throttle was at 103% and could have sworn I had previously set it at 100% (endpoint adjustment) so changed it to 100%

I'm now wondering if that's why I'm not getting 4300 in idle 3. I'll try changing it back to 103 tonight.

Why not set the high endpoint the way that the manufacturer suggests? First check your throttle travel in tab 5 of the wizard. Then remove blades etc and tweak the end point to get max revs It's all explained on tabs 5 and 12. Tab 5 gets your transmitter travel right and then tab 12 sets the ESC. The documentation on screen explains it well.

For electrics, you need to do these two steps regardless of whether you use internal governor or the Brain/Icon governor or even no governor at all.


Regards

Acrow

[pctomlin]

From what you are saying set up the transmitter panel in Brain software so throttle is 0/100. In the governor set up panel set the min throttle value to 1173 and the max throttle value to 1940 and the Castle ESC will be ready to go in Helicopter/Set RPM mode. The ESC is looking for something below 1.2 (1200) for min throttle and something over 1.9 (1900) for max throttle. These settings in Brain software satisfy the Castle setup video explanation of you hearing the tone and then adding a couple of more clicks.

Any doubts about what the Castle ESC is looking for in each vehicle mode click the blue ? beside the box and it will open an information dialogue box explaining throttle settings for each mode type.

[3D Dave]

Thanks guys. I do have the 113 tooth but I thought some thread I read said to use 112 in the calculation (and thought it was 112).

I set the Castle up after watching this a few times:

Team iKON - Castle ESC Setup for iKON Gov (17 min 11 sec)

(which I understood but wasn't going to run multi-rotor mode and Brain gov. as I didn't want the complexity).

I just finished going through the Castle and Brain wizard setup one more time (zeroing in my collective and cyclic ranges too).

The first spoolup went instantly to what seemed like 4500. I shut it off and power cycled the TX and heli. The next power up went normal and low and behold I had 3 different headspeeds :-)

So, I don't know why I wasn't getting the 3rd throttle request but I think it's working now. If the maiden doesn't go well, I'll let you know. Maybe I'll need to change the main gear value to 113.

I really appreciate all your help as the last Castle ESC's I had were a Phoenix 45 and HV 85 quite a few years ago which didn't require much setup.

The Brain is my first foray into a different FBL system as I've used V-bar since 2009.

@ Acrow, I did set the endpoints in the wizard just as instructed.

@ Paul, I'm almost positive my min throttle was under 1200 and max was over 1900 but I've shut it all down now.

Thanks again guys!!!

[pctomlin]

One thing on loosing your IU2 setting. If you were just barely over the 1900 setting, and lowered the transmitter setting from 103 to 100 in the setup software, the Brain FBL unit may not have been sending a true 100% throttle output to the ESC. With a flybarless, the transmitter tells the unit what throttle output you want, it is the FBL unit that actually is in direct control of the throttle output to the ESC.

[3D Dave]

Thanks Paul. That's exactly what I was thinking once I read it.