keithcitra

my 200 amp esc keeps blowing running it with 2 4s blocks in parrelel 36 50 fiago motor 2100 kv

Got RPM

In order to help we need specific information:

- the exact ESC name
- the exact boat used
- the propeller used
- the exact packs used including mAh and C rating

What do you mean by "blowing"? That usually means it caught on fire or stopped working forever. Describe exactly what happened.

If you can't give us all the information requested we can't help you. A photo of the inside of the boat would be nice.


.

keithcitra

the boat is a hydro hull from china 30" long 200 amp mystery esc 3650 viago motor 2100 kv 445 prop i have run it with 2 2s 5000 mah 70 c in series no problem till i hoocked up the 4s blocks 4000 mah 115 c poped something in the esc now the motor just chatters hoocked up a nother esc the motor works

Patrick125

With that prop that motor is likely to get really hot and over heat the wires and connectors. I think you should check the motor connectors and see if it is still properly solder to the motor wires. Check the connectors on the esc too, battery and motor connectors. Because in my experience there is no way that setup will run more than a 1 1/2 to 2 minutes without melting the solder off the wires causing the connection to brake and make the boat stop. A 445 is too much for that small motor especially on 4s if you want a reliable setup. A graupner k40.5 might be much better for your setup. But I feel the motor is too small in the first place to be running 4s and props above 40 mm.

keithcitra

dint have time to heat up it poped the esc in about 2 sec

Patrick125

Do you know for sure the cells were connected right, and you didn't connect the power to the esc reverse.

Got RPM

Correctly setup the OP's motor/ESC combo should run fine, it is similar to the stock UL-1 RTR hydro. It sounds to me like he plugged in two 4S packs in series for a total of 8S to the ESC. The Mysteries have a 6S max, more and they will be damaged. If this is the case the ESC "blew" once, now it's "broke".


.

Patrick125

The UL-1 motor is a real nice motor, the feigao 3650 is nowhere near close to the ul-1 motor, I have tried 2 pole brushless motors in the sizes of 2858, 3660 and 3674 and those motors cannot discipate heat like the aquacraft motors, and kv for kv the aquacraft will handle a much bigger prop. I was thinking to recommend that the op look into getting the aquacraft system.

Got RPM

I ran various 36 mm Fiegaos for years in similar setups, and sadly the current UL-1 motors are not what they used to be. I raced one for four years, three heats a month most years and it finally gave up the ghost last year. The new one lasted seven heats, fellow club members as well as many posters on OSE have had similar experiences. If not for that I'd recommend the UL-1 too. Today I'd suggest a 3630 TP Power motor, right now their quality is pretty good.

BTW this loss of quality is a common business model for many Chinese manufacturers. They develop a good product, sell enough to get a good rep, then drop the quality to save a few cents. This is not limited to the hobby field, it goes through virtually all products. Not all Chinese manufacturers follow this model, but it is often tough to tell who to trust.



.

Patrick125

Got RPM, what kind of runtime you got with the ul-1 motor and the grimracer 4255, or what ever prop you ran. Why I am asking is because I hear people call all kind of number for they ampdraw which I find to be impossible. For reference I run the aquacraft 1800 motor, I am getting over 6 and half minutes runtime on grimracer 4200 4s cells. And I run full throttle in the straight and slow down for the turns, I am putting 2600 to 2800 mah back into the pack when I run like this. Which work out to 24 to 26amp average runtime. I run in salt water which I know is much harder than fresh on the motor. In fact base on testing I know salt water multiplies the load on the prop by 140% in a static test over fresh water. So please let me know what kind of runtime for getting with a given motor, prop and battery capacity. I did a run during this pass week with a 1730kv leopard 4092 and octura m545, 4s grimracer 4200mah, with this combination I am getting over 4 minutes of had running until low voltage cut off. The average amp draw is under 40 amps with this setup running full throttle on the straight and slowing down to turn.

Got RPM

I ran a modified 42x66 prop on my Insane hydro, UL-1 motor, Castle controller and 4S1P/5000 mAh pack. This was a race boat so run time was not important. A race lasts about 120 seconds (start to finish, includes some dead time waiting on the start but WOT the rest of the time) and I would use ~2400 mAh capacity. Logging showed that the average amp draw while actually racing was ~80 amps. Top speeds were 50-52 mph.

How are you measuring run time? Most people just guess, leading to incorrect run times. I use the ESC logging so I know exactly the time, amps used and amps at any part of the run.


.

Patrick125

I measured the 6 and half minutes runtime with a gps in the boat, using moving time. And thank you for responding. With that prop and that motor I would have gotten 3 minutes runtime at wide open throttle to consumer 2400 mah. Have said that I can see why the ul-1 motor seems to not hold up for you guys. The motor can may not be that hot, but the motor winding does get really hot, and in my experience it would melt the solder in a short space of time off the motor connectors or the ones on the esc going to the motors, then the wire would separate from the connector and the boat would stop dead in the water and your motor would not work. It would be like when you pull the throttle it would spin very slow if it spins at all. This has happen to me many times, all that happen is one of the motor wires may have broken contact with the connector or the speed control wire may have broken contact with one of the connectors.

Patrick125

Something else that should be mention is that because of the internal resistance of a feigao 3650 2100kv, Using a 445 would make that motor generate a lot of heat and it is possible that this high level of heat is transfer to the esc threw the wires casing the esc to get excessively hot really fast and as a result damaging the esc.


I think it would be a good idea not to use that motor on 4s with the 445, I personal would buy a bigger motor like a leopard 3674 or 4074 with a y wind. like a 2y or something ending with y, and a good kv would be 1700 to 2000 kv for 4s.