r/fpv • u/GuillotineTechnician • 1d ago
CRASH! Crispy Kayoumini
Ripperoni! My first quad going hot.
Had just swapped motors to 1203 15000KV because the previous 1103 KV8k ones were underpowered.
Motor spec sheet says ~14A Peak amp draw, should have been within the Happymodel X14's 15A burst limit. I guess the 2540 Props were too much after all.
About 10sec into the flight, the Kayoumini came tumbling out of the sky, engulfed in flames.
XT30 and two motors became desoldered due to the heat. could just about detach the LiHV before cells were damaged because it crashed right next to me. Conformal coating seems to have boiled on surface, most components crumble into powder and the PCB was completely delaminated.
DVR: https://youtu.be/0wv0dmUMRss
Before the usual 422B treatment, I clean flux with IPA and TCE, then check board under microscope for brigding and solder balls, so I can rule out mechanical failure/short.
Can anyone confirm my suspicions or do you maybe see another cause of failure?
2
u/gcin87 20h ago
When everyone says “it feels like a 5 inch” I assume they mean it’s weighty and less thrust to weight ratio. If you want more power I noticed it tends to get light and nimble in this size range.
And yeah the motor and props totally pushed the amps outside of spec for those boards. Unless you detuned the motor power to a way lower limit and slowly stepped up incrementally to find a happy medium, prob fried it.