Bad day.Smoked esc, cracked motor

[Tony]

Bad day yesterday at the pond for my H&M Maritimo on her maiden run. Took the boat out ran two passes, brought it back in, checked tempt. Everything seems cool to the touch, barely warm. Took it back out ran off and on for about 4 min. Suddenly, boat stoped in middle of pond for about 30 sec. Then all of a certain, a loud pop sound. The hatch popped open, and " magic smokes " came out. Upon inspecting the boat, i noticed the motor mount came loose from the boat as well. So, what could contribute to this?

My set up:
boat, 37"
180amp Seaking esc 5mm connectors to motor
580 10L Feigao
6S 5000mAh 25C Turnigy (parallel) with preinstalled 4mm connectors to esc
Octura x445 s/b prop

Only good thing was i got to see she jumps out of the water, ran very stable within that 4 min. Wish i have the video. Anyways, she's gonna be power up again soon, but i don't want to go through this again. So, help me out guys. Thanks!

[AntronX]

What is it with people asking what went wrong and not posting a single picture of their setup?

[sailr]

If the motor came loose, it may have bound up on the shaft, creating more Amp draw than the esc could handle. Poof! Reasons for motor coming loose include unbalanced prop. Too much space between stuffing box and collet, allow the flexshaft to 'whip'. Both of these conditions create tremendous vibration. Of course there is always the 'you didn't get the bolts tight enough' but we'll assume that is not the case.

[Brod]

I highly doubt it was overamped unless a very wet setup.
I run a 1600kv 400gram Medusa on 6S with both a 445 and 442 prop and stuff comes back warm but not hot.
Average amp draw being about 70Amps.
More than likely motor come loose,and shorted the motor inside,then taking the esc with it,you did say the motor is cracked..
But still a few other possibilities.
Brod..

[Tony]

What is it with people asking what went wrong and not posting a single picture of their setup?

The esc, and the motor burnt, and i took it out of the boat asap. What else to show. Besides, i had listed the set up configuration above. Thanks for responding anyways.

[rockwerks]

The esc, and the motor burnt, and i took it out of the boat asap. What else to show. Besides, i had listed the set up configuration above. Thanks for responding anyways.

HOw did the motor break? What condition where the wires in? how was it wired in the boat? pictures would answer a million questions.

[Tony]

I highly doubt it was overamped unless a very wet setup.
I run a 1600kv 400gram Medusa on 6S with both a 445 and 442 prop and stuff comes back warm but not hot.
Average amp draw being about 70Amps.
More than likely motor come loose,and shorted the motor inside,then taking the esc with it,you did say the motor is cracked..
But still a few other possibilities.
Brod..

Someone on here used FEcal, and told me this set up would be about 100amp which is well within the limit. So, i think two posible scenarios that coiuld happened. 1) maybe water cooling wasn't enough and cause over heat. 2) The motor mount broke off because this motor has too much power, and the mount wasn't strong enough to hold it in place.

Like i said, i ran two passes, took it in, checked everything was fine. All this happened after the boat has already stopped in the middle of the pond.

[Tony]

HOw did the motor break? What condition where the wires in? how was it wired in the boat? pictures would answer a million questions.

The motor did not come loose from the mount. It was the motor mount that has broken off from the boat. I didn't even know the magnet inside of the motor has already cracked till i got home, and took it out. The wires were still intact with the esc, and none of the connectors melt. 5mm connectors between esc and motor, and 4mm between lipos to esc. BTW, it was set up with 6S2P 5000mAh parallel. I'll post some pics for you guys when i get home. Thanks.

[Flying Scotsman]

What motor mount and how did you prepare the mounting surface and method of attachment?

Douggie

[Tony]

Douggie,

The motor mount was mounted by FineDesign. It came with the FDM hardwares and all in H&M Maritimo hull.
Its like this one here: http://www.offshoreelectrics.com/pro...rod=grp-1157.2

[Flying Scotsman]

Are you sure that is the motor mount he supplied for a 580L? If it is, no further comment. If you could post a pic of the inside of the hull, it would be great

Douggie

[Rumdog]

sailr's post sounds right on the money to me. I can't see it being coincidental that the esc went as the mount ripped out of the hull. Too much cable exposed between the coupler and stuff tube? No stuff tube support? unbalanced prop? Loose strut? Any of this will cause excessive vibration and/or stress and friction on the driveline. This will cause extremely high amp spikes and fry the esc really fast!

[Rumdog]

I would also suggest a much stronger motor mount!

[AntronX]

The esc, and the motor burnt, and i took it out of the boat asap. What else to show. Besides, i had listed the set up configuration above. Thanks for responding anyways.

Pictures would tell me:
1. Length of your wires.
2. Motor mount type.
3. Watercooling of motor or lack of.
4. Maybe I would notice something else wrong.

Lets see, you say your motor magnet is cracked. Seems to me either poor motor quality or serious vibrations of flex coupler or shaft is the problem. So the magnet flies apart and jams into copper windings of your Feigao motor. That magnet's rotating momentum is transferred to motor case and motor mount. The mount breaks off. At the same time your motor's windings are short circuited. Your ESC does not know that yet and energizes next phase, which is a short circuit. The current going through the power transistors in your ESC quickly rises several times past their maximum current rating and they simply pop. Next there are few more steps to total fiery hatch blowing catastrophic failure. At the end you end up with smoke and dead boat.

This is another example of how trying to save money buying cheap low quality motor ends up costing you more, and you end up buying Neu motor later anyway.

[Tony]

Are you sure that is the motor mount he supplied for a 580L? If it is, no further comment.

Douggie

I'm not sure, but the 580 L fits on it like the 540xl. Anyways, i need a new motor mount, esc, and motor. Would any of the 540xl motor strong enough for this hull?