Seaking Boat ESC recalled by factory

[sundog]

Sundog,

I think that you were running too high a KV in a 28" mono. I think your hull is more suited to a 1900kv (9XL or equivalent), and a high voltage ESC.

I'm afraid you might cook your ETTI running a 2800kv in a 28" mono, unless you are using a very small prop, Octura X440 or smaller.

I'm running a jet drive with a 40mm impeller and will be sticking to 3s lipos. With 30% inefficiency I should be turning 22k. Do you think the ETTI will handle that? With a cap board?

[Meniscus]

Thanks Ben. Really, any idea about the 180A setup?

I don't have any experience with the larger amp ESC, but for my smaller one, sometimes I have to program again in order for it to take. I'm not sure why it goes back to default, but it has happened a few times. I'm guessing it's because I don't run another wire to prevent the spark when I plug in the battery.

I'd recommend programming the throttle twice in a row and see if it makes a difference. Have you tried a different transmitter? I know it shouldn't matter, but just throwing out an idea.

[Punisher 67]

I smoked my 180 last week running a 2300kv KB45l on 6s Rhino 25c 4900ma in my 28" mono jet boat. The caps overheated. Melted the 4mm bullet connectors together. The KB45 'freewheels' now - cooked the magnets. I used cooling coils, but it needed a jacket. Should have checked temps sooner (2 minutes).

Sent it back today for a replacement per RC Model Land. They said not to run it on 6s, that that would be over 28v with fresh lipos, and it's rated at 22.2v (but also says 6s in the literature). Live and learn.
In the meantime, I bought a 150A ETTI Navy Race w/bec, from OSE and a Generic 2800kv 540xl (rated at 110A) from Hobby City to replace the KB45 electric water heater. Now I wonder if I should have gotten the external cap board.

Dave a 2300KV motor would be great on 4 Cells and no more , 6 cells with that motor is way to much and you are going to smoke something the rpm is way to high for anything other than a saws boat . I have beat the piss out of a 180 on the bench but stayed within the recomended limits and it still works like a new unit , even smoked a Plett 220/50/3 in the process

http://forums.offshoreelectrics.com/...0&d=1244749312

http://forums.offshoreelectrics.com/...9&d=1244749312

An absolutely fully charged 6cell lipo pack is 25.2volts and should not be any more

[sailr]

Thanks for the tips. I'll give 'em a try.

I don't have any experience with the larger amp ESC, but for my smaller one, sometimes I have to program again in order for it to take. I'm not sure why it goes back to default, but it has happened a few times. I'm guessing it's because I don't run another wire to prevent the spark when I plug in the battery.

I'd recommend programming the throttle twice in a row and see if it makes a difference. Have you tried a different transmitter? I know it shouldn't matter, but just throwing out an idea.

[raptor347]

It's likely that the magnets started to go due to heat. That increases the kV and in turn current given the same load. Which in turn leads to more heat further damaging the magnets until you finally draw too much current for the esc. It's a nasty closed loop. I've done it a couple times by mistake.

I run the SK180 on 6S in my big rigger with a 1527/1y with no problem at all.

I'd say run a smaller more efficient motor with a kV more suitable for the voltage you want to run.

I smoked my 180 last week running a 2300kv KB45l on 6s Rhino 25c 4900ma in my 28" mono jet boat. The caps overheated. Melted the 4mm bullet connectors together. The KB45 'freewheels' now - cooked the magnets. I used cooling coils, but it needed a jacket. Should have checked temps sooner (2 minutes).

Sent it back today for a replacement per RC Model Land. They said not to run it on 6s, that that would be over 28v with fresh lipos, and it's rated at 22.2v (but also says 6s in the literature). Live and learn.
In the meantime, I bought a 150A ETTI Navy Race w/bec, from OSE and a Generic 2800kv 540xl (rated at 110A) from Hobby City to replace the KB45 electric water heater. Now I wonder if I should have gotten the external cap board.

[sundog]

Dave a 2300KV motor would be great on 4 Cells and no more , 6 cells with that motor is way to much and you are going to smoke something the rpm is way to high for anything other than a saws boat . I have beat the piss out of a 180 on the bench but stayed within the recomended limits and it still works like a new unit , even smoked a Plett 220/50/3 in the process

http://forums.offshoreelectrics.com/...0&d=1244749312

http://forums.offshoreelectrics.com/...9&d=1244749312

An absolutely fully charged 6cell lipo pack is 25.2volts and should not be any more

Yes Peter, you are no doubt right. Too much voltage - things started melting (sooner that I expected). I should have used a water jacket instead of wrapping it in tubing, that would have helped, I'm sure. On 3s it was spunky, and so I tried 6s. It jumped out of the hole a foot or so (!) and after a quick run up the river, quit midstream. That motor is powerful, but very amp hungry. I think the generic 540xl will perform similarly, with much less amp draw.

Raptor: I 'rescued' it some 15 minutes later, and spit sizzled on the motor. It was hot. Real hot. I agree, a smaller (more efficient) motor should do better.

[DISAR]

Dave a 2300KV motor would be great on 4 Cells and no more , 6 cells with that motor is way to much and you are going to smoke something the rpm is way to high for anything other than a saws boat . I have beat the piss out of a 180 on the bench but stayed within the recomended limits and it still works like a new unit , even smoked a Plett 220/50/3 in the process

http://forums.offshoreelectrics.com/...0&d=1244749312

http://forums.offshoreelectrics.com/...9&d=1244749312

An absolutely fully charged 6cell lipo pack is 25.2volts and should not be any more

OOOOW!
Super test bench. Do you do that kind of test for other ESCs as well? Any feedback-results you can share?

[sundog]

Peter Zicha
An absolutely fully charged 6cell lipo pack is 25.2volts and should not be any more

Let me correct that: The email reply from RC Model Land stated a fully charged 6s would be 25.8 (not 28) so would be too much voltage for the esc. My bad. Can't remember sh*t That's a spiffy test rig. I bet you can smoke 'em proper.

[Punisher 67]

OOOOW!
Super test bench. Do you do that kind of test for other ESCs as well? Any feedback-results you can share?

I haven't tested any other ESC's with this bench but I did do a Neu 1515 vs Medusa 3680 test , surprising results

http://forums.offshoreelectrics.com/...ht=medusa+3680

[cacofonix]

hi there

hope it will help
in france we are 3 with almost same setup
Hull : LIZARD
ESC : Seaking 180A
Lipo : 6S or 2x3S (5000 25C flymax)
Motor : KD600 (outrunner from hobby city) / Feigao 12XL / ...
props : K45 / K48 / X445 / X447 / K51
my self i test :
- feigao 12XL : smoked after 4 run
- KD600 : to much rolling due to prop torque
- Hacker B50 12XL
- prop

never had a problem, esc T° never goes more than 40 °C

i use a Ubec, but other use internal bec. one of us had probably made 20 runs with this setup.

latest week end we even try a K54, not too long, but motor power was not enough.

herve

[sailr]

Update on status of Seaking ESC's

Here is the latest. Got a reply from the factory. Looks like they're doing a complete re-design with new printed circuit and everything. Dang! Another month.

Hello, Jim

Good morning!

We decide to change some hardwares of the boat ESC, so it will takes longer time for making new PCB and new ESC.

We estimate that the new boat ESC will be re-marketed at 30th, Sep.

Best Regards!
Jack

[sean450]

Has anyone had any trouble from there 120's? I guess I got lucky cause I havn't smoked it yet. I did a bench test @ 22.2v running it behind a 90mm ducted fan turning at full throttle for 3 minutes and it was fine. ESC was not in the exhaust of the fan and was pulling 90 amps.

[Himalaya]

for the 120A, better silicone seal it before use. Also a better water jacket having thicker pipes is recommended. I did both when it came back from the Hobbywing service dept. never fail again.

[Brod]

Just for the record,popped one of my 3 Turnigy 180's today.
had about 12 runs so far on this one and no probs.
Connected up another pack,started ok then just died.
It must have gone short circuit,it took out 2 5S packs which were paralleled,middle cells on each pack burnt out.
No exterior damage to the Esc.
very disappointed.
Brod..

[TRUCKPULL]

Any body know when these will be available again???

Larry