Blackjack29 troubles

[Scoop]

Please help ! First time in the water motor went to dead short . Motor was replaced by hobby shop no problem . Took boat out today boat ran fine for five minutes . Looking everything over red Lead to motor solder was melted wire was hanging . Batteries were warm motor was real warm . I could hold on to motor . The batteries are 11.1 v 3s 50c . There was constant water out the cooling hole . When I went to charge batteries one of the batteries had a dead cell .the boat is programmed for high voltage cut off . What do I do ran gas for 20 years never have I been so frustrated . Could the dead short have ruined the battery ? I charged them before I went out thay were balenced the batteries have been charged 3x

[1truckerdan]

What brand of lipo and the mah?

[Scoop]

Speed pack hard case 5200mah

[Heaving Earth]

Well, despite what the silly proboat box claims of 6s compatable says, I don't believe they are capable of 6s. I've seen many people having issues running them on 6s.

[1truckerdan]

I replaced my "factory" connectors (motor wire connectors) with at least 5.5mm bullit connectors
http://www.offshoreelectrics.com/pro...d=ose-55bullet
And my bat to esc connectors to 6.5mm
http://www.offshoreelectrics.com/pro...s-65-connector

[SloHD]

We have issues running 4s... 6s is not really all that recommended in the real world for stock proboat cats.

[Scoop]

What can I do about the battery ! I ordered the same batteries in 7.5 volt . What would you do? At 100.00 a pop ! This is not dependable as it is .

[Heaving Earth]

You ordered more 3s packs?

[SloHD]

Sounds like you ordered 7.4v lipos? A pair of 2s lipos?. $100 for the pair or each? Hopefully for the pair... You also need to upgrade the motor/esc bullets to 5.5mm or bigger. Then get some of those new castle 6.5mm connectors for the esc/batt connection. Have a look in the proboat forum. This has all been heavily discussed in there.

[Scoop]

Yes for the battery 7.4 2 s I will change them out . Thank you for the help . I will go to the forum and read. I wonder why Rc boat magazine would run a setup in a test boat that would cause people such headaches . I hope changing the leads out will take care of the problems that I am having .

[BHChieftain]

Hi,
Good choice dropping to 4S. I think the boat works great on 4S myself, especially if you upgrade the prop to x642 (note, even with just the upgraded prop I would change all of your connectors to 5.5mm bullets- cheap insurance and buys you headroom).

You can run higher voltages with some mods:

The blackjack has an 1800kv motor, which would run solid up to 5S ( 1 2S pack + 1 3S pack) provided that
1) you change all of the connectors to 5.5 mm bullets
2) you upgrade the ESC (prefer 180A)

The miss geico has a 1500kv motor and with the same mods can up up to 6S

(both would have 33.3K rpms)

If you run the 1800kv motor on 6S that is almost 40K RPM and you risk wearing stuff out pretty quickly.

The other thing is that many ESCs internal BECs don't handle above 4S. But even if you were to disconnect the internal BEC on the stock 80A ESC and ran an external RX battery you would be "playing with fire"!

Chief

[Scoop]

When I change the prop where should I set the motor timing . What brand of batteries do you use? Thank you for your help !

[SloHD]

Low timing. I use venom batts myself...

[Scoop]

Called the help line after talking with them thay said send it back take picture of battery with reciept . Thay would replace the battery with a new one . And possibly replace the boat . Everything back within two weeks .

[hydro_pyro]

I run mine on 6s all the time without problems. It can handle it, as long as you upgrade the motor connectors and keep them from touching each other.

The voltage cutoff only works with 4s. You will NOT have a low-voltage cutoff when you run 6s.

There are plenty of Lipo packs available from other vendors which will cost MUCH less. At the worst, you may need to outfit them with your own connectors. On my boat, I use 2s hard-pack Lipos with banana connectors and a jumper. When I run 6s, I add a third pack in front of the motor and a second banana jumper. I have a balance connector soldered into the jumpers that allows my to plug in a Lipo voltage alarm.