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Very HOT Turbo Gremlin motors (BetaFlight Tunning issue?)

#1
I've tried all kinds of things.
1. Ensured motors are not shorted by long screws.
2. Tried BetaFlight 3.1 - 4.0
3. Tried turning off notch filters
4. Tried changing BLHeli ESC Timing
5. Tried DShot 600 and 200
6. Tried lowering D in the pids all the way to 5

Motors are still running very hot, too hot to grip with fingers for more then 4 seconds. That's after only a 10 second hover in the basement.

I'm afraid they will burn up.

Can anyone suggest anything else I can try doing? I don't think it's possible to soft-mount the FC???

Please help.
 

PsyBorg

Wake up! Time to fly!
Mentor
#4
A few pics of your build and some screenshots of your betaflight pages could help alot as well as an all up weight, battery used and props details.
 
#5
Props are the 2.5x3.5x3 (the turbo gremlin "sidewinder") came with these ...
Battery is the 4s 850mah tattu 75c

I'm attaching some additional screenshots and build photos as per suggestion.

Thank you very much for your help...

also .. Here is my DIFF dump from CF

Code:
# version
# Betaflight / OMNIBUSF4 (OBF4) 3.5.6 Feb 16 2019 / 13:28:33 (c28ca22f9) MSP API: 1.40

board_name OMNIBUSF4
manufacturer_id AIRB

# name
name uLightMe_FTGrmln

# resources

# mixer

# servo

# servo mix


# feature
feature -RX_PARALLEL_PWM
feature RX_SERIAL
feature TELEMETRY
feature LED_STRIP
feature AIRMODE

# beeper

# beacon
beacon RX_LOST
beacon RX_SET

# map

# serial
serial 2 64 115200 57600 0 115200
serial 5 8192 115200 57600 0 115200

# led
led 0 7,15::ATW:0
led 1 8,15::ATW:0

# color

# mode_color

# aux
aux 0 0 0 1700 2100 0 0
aux 1 1 1 900 1075 0 0
aux 2 2 1 1400 1575 0 0
aux 3 13 2 1700 2100 0 0
aux 4 15 2 1700 2100 0 0
aux 5 35 3 1275 2100 0 0

# adjrange

# rxrange

# vtx

# rxfail

# master
set mag_hardware = NONE
set baro_hardware = NONE
set serialrx_provider = FPORT
set serialrx_halfduplex = ON
set motor_pwm_protocol = DSHOT600
set vbat_warning_cell_voltage = 31
set yaw_motors_reversed = ON
set small_angle = 180
set deadband = 2
set yaw_deadband = 2
set pid_process_denom = 1
set osd_vbat_pos = 472
set osd_rssi_pos = 2434
set osd_tim_1_pos = 394
set osd_tim_2_pos = 2442
set osd_vtx_channel_pos = 2082
set osd_avg_cell_voltage_pos = 2455
set vtx_band = 1
set vtx_channel = 4
set vtx_power = 4
set vtx_freq = 5805
 

Attachments

PsyBorg

Wake up! Time to fly!
Mentor
#6
Several ideas come to mind.

I would start by defaulting everything. Then go in and set the radio up so channel centers are at 1500 and end points are at 1000. That way we can eliminate radio issues.

The esc range is wayyyyy off from the just over 1000 to just under 2000 it should be.

If you are running dshot those numbers point to the possibility of the wrong .hex files on the esc's.

I have not set up the new turbo gremlin but for the original I fly multishot on 16.5 esc firmware.

I see you have a stack setup so hard mounting is not the best for tiny motors and stubby props.

I would grab a set of the rubber standoffs and put them between the pdb and fc.

I am nearly positive what is going on with the escs range is most likely what us causing the over heating.
 
#7
Several ideas come to mind.

I would start by defaulting everything. Then go in and set the radio up so channel centers are at 1500 and end points are at 1000. That way we can eliminate radio issues.

The esc range is wayyyyy off from the just over 1000 to just under 2000 it should be.
I adjusted the endpoints by using the RXRANGE command in CLI
I adjusted the ESC min max values to 1000 - 2000 in BLHeli

kept it on DShot600

and ... seems that it helped a lot ... motors still feel warm but nowhere near what they were before

Thank you very much PsyBorg!
 

PsyBorg

Wake up! Time to fly!
Mentor
#9
I adjusted the endpoints by using the RXRANGE command in CLI
I adjusted the ESC min max values to 1000 - 2000 in BLHeli

kept it on DShot600

and ... seems that it helped a lot ... motors still feel warm but nowhere near what they were before

Thank you very much PsyBorg!
Now the rest can be done with tuning. I prefer fixing things with pids before filters. Many others prefer using the filters.

Joshua Bardwell has a video on setting up the newest betaflight that has a ton of info.

I just built my first betaflight 5 inch and am learning it as well. (If the darn weather will ever let me outside to fly) I am more used to KISS gear.