Over the last few months I've flown this plane a lot. It's great fun and I used it on some FPV meetings of course. Then the Motor died and I search for replacement.
Also found out a few other tips that I collected in this vid.

Check AtomRC's current sale if you need one of their planes!
https://atomrc.com/collections/fixed...

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Shoutouts:
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my initial review:    • ATOMRC Dolphin  not just another rev...  

3D printed parts for the Dolphin:
Motormount: https://www.thingiverse.com/thing:560...
other parts:
my modified, simple DJI O3 cammount: https://www.thingiverse.com/thing:590...
Air scoop: https://www.thingiverse.com/thing:485...
https://www.thingiverse.com/thing:523...
ESC cooling lid: https://www.thingiverse.com/thing:514...
div. nose parts: https://www.thingiverse.com/thing:536...
air unit nose mount: https://www.thingiverse.com/thing:515...
Nose for Insta360 Go 2 https://www.thingiverse.com/thing:492...
3d printed latches for securing the canopy https://bit.ly/3AoxRKA



FIND A GOOD MOTOR / ECS / PROP Combo:
====================================
Esc swap: (always remember to do a new ESC calibrate!)
TMotor F90 2806.5 Long Range 1500KV 31€ 47g 1.08kw
+ TMotor F35A ESC 2S6S BLHeli 32Bit
4S 7x4.2 biblade = 145kph horizontal (but 3D speed from INAV)
26amp, 1.4kg thrust 94°C calculated Thrust/weight: 1.73
6S with 6x4x3 Prop: Prop stall at 80%, around 100kph

try different PIDs in flight:
find free channel and switch then assign    • Profile change in iNav Programming fr...  

PID tuning tips:    • INAV Fixed Wing Roll Tuning Check  A...  
Roll P I D FF
myRoll 18 10 8 47
ROLL 4 12 6 46 this worked!!!
5 10 46 small change but shakier!
myPitch 15 20 5 238
PITCH 10 20 190 this works!!!

set fw_level_pitch_trim = 4.000 (so the plane flies with 4° nose up)
gyro_hardware_lpf set to 20 (lower is more filter, less snappy?)

Jittery settings: (until 22.8.23)
set fw_p_pitch = 15 set fw_p_roll = 18
set fw_i_pitch = 20 set fw_i_roll = 10
set fw_d_pitch = 5 set fw_d_roll = 8
set fw_ff_pitch = 238 set fw_ff_roll = 47

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Filmed with: Sony A7c, edited with Premiere Pro

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●▬▬▬VIDEO INDEX▬▬▬▬▬▬▬▬▬▬▬▬●
00:00 Intro
01:07 burning out motors...
02:09 BEST Motor / ESC / Prop combo
03:58 O3 Overheat
05:03 PID tuning for smooth flight
06:32 flight with new PIDs
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#RCSchim #fixedwing #dolphin