Proboat Blackjack 29 1800kv motor getting hot....Anyone else had these problems?

[seabird1]

Hi.. some of us here in the U.K. have had overheating problems with the stock 1800kv motor and stock 80amp 6s lipo compatible ESC in the Blackjack.

When running the boat on 6s 5000mAh 40c lipo setup the motor gets very hot and in one or two instances the 3 wires to the motor (i should say that come out of the motor casing) have almost fused together, insulation melted.

On talking to Horizon Hobby here in the U.k., they said this.. If were using 6s in the Blackjack then we need to use the 1500kv motor from the Geico as it will run cooler due to the lower kv rating. They said the 1800kv motor gets way too hot on 6s as it can't cope with the heat build up. This makes no sense to us as the Blackjack comes with the 1800kv motor as standard, and is says 6s compatible on the box!

Id'e like to hear if anyone else had these issues on 6s lipo with the Blackjack 29??

Thanks

[srislash]

I would start with upgrading the connectors and prop tuning. You should probably run a smaller prop than stock. What is on it now?

[lenny]

Hi,

Your thread is misleading because of the header as blackjack 26".
We need to fix that.
Or you may not get much info or answers back.

Are you using 5.5 bullets for connector on the whole setup ?
If not,
That is the first thing I would do to help with the heat.

Post some pictures of your boat and the inside setup.

Hear is a link to some info.
http://forums.offshoreelectrics.com/...ng-6s-question

[kfxguy]

Hi.. some of us here in the U.K. have had overheating problems with the stock 1800kv motor and stock 80amp 6s lipo compatible ESC in the Blackjack.

When running the boat on 6s 5000mAh 40c lipo setup the motor gets very hot and in one or two instances the 3 wires to the motor (i should say that come out of the motor casing) have almost fused together, insulation melted.

On talking to Horizon Hobby here in the U.k., they said this.. If were using 6s in the Blackjack then we need to use the 1500kv motor from the Geico as it will run cooler due to the lower kv rating. They said the 1800kv motor gets way too hot on 6s as it can't cope with the heat build up. This makes no sense to us as the Blackjack comes with the 1800kv motor as standard, and is says 6s compatible on the box!

Id'e like to hear if anyone else had these issues on 6s lipo with the Blackjack 29??

Thanks

What prop are you running?

[kfxguy]

Btw, im almost 100% positive that a 80 amp esc isn't suitable for running 6s on a 1800kv motor. And your turning 39,960 rpms with a stock motor. It'll be fun while it lasts. Ill give you a tip to bring your temps down if you haven't done it already, "y" off your water hose to each the motor and esc and the "y" them back together before the exit hole. Sends cool water to each one instead of heated water from one to the other. Some people don't believe in this, but it does help keep temps a little lower. Check your temps before and after and you'll see.

[Doug Smock]

Merged the two threads and cleaned up a bit fellas.

[lenny]

Bad hair day again ?
That is just every day normal for me.

[kfxguy]

Hi,

Your thread is misleading because of the header as blackjack 26".
We need to fix that.
Or you may not get much info or answers back.

Are you using 5.5 bullets for connector on the whole setup ?
If not,
That is the first thing I would do to help with the heat.

Post some pictures of your boat and the inside setup.

Hear is a link to some info.
http://forums.offshoreelectrics.com/...ng-6s-question

Agreed. Hopefully he's not running deans connectors.

[lenny]

Ok hear is the info I was trying to find for you.
http://forums.offshoreelectrics.com/...-6S-won-t-work!

And this to.
http://forums.offshoreelectrics.com/...-have-an-issue

And upgrading the esc would be a good idea I think,
Because it is the weak link in the setup besides the connectors.

Hi.. some of us here in the U.K. have had overheating problems with the stock 1800kv motor and stock 80amp 6s lipo compatible ESC in the Blackjack.

When running the boat on 6s 5000mAh 40c lipo setup the motor gets very hot and in one or two instances the 3 wires to the motor (i should say that come out of the motor casing) have almost fused together, insulation melted.

On talking to Horizon Hobby here in the U.k., they said this.. If were using 6s in the Blackjack then we need to use the 1500kv motor from the Geico as it will run cooler due to the lower kv rating. They said the 1800kv motor gets way too hot on 6s as it can't cope with the heat build up. This makes no sense to us as the Blackjack comes with the 1800kv motor as standard, and is says 6s compatible on the box!

Id'e like to hear if anyone else had these issues on 6s lipo with the Blackjack 29??

Thanks

[hydro_pyro]

The motor is NOT turning 39,000 RPM. Haters need to put away their calculators. It doesn't run "no load" speeds under load. 30K to 35K rpm is more typical for 6s. This can be proven by measuring the audio frequency of the screaming motor as it passes by the dock. The factors that cause the overheating have little to do with RPM.

Jack your strut up above the bottom of the sponsons and add some negative (down) thrust angle, using the "dialed in" strut mods detailed in this forum. This will increase prop slip in the midrange so the motor sees less load. It will also help to lift the stern to cut down on bowlift and blow-overs, and reduce porpoising. You'll enjoy better handling, more speed, and less heat.

Balance the prop to reduce vibration.

I also cut two prices of roof rubber sheet and poked 3 holes to hold the motor wire connectors apart for better heat dissipation.

[96motorhead]

I have a stock blackjack 29. I run dinogy 65c 5000mah batteries in it and the motor gets warm but nothing that would burn my fingers if I touched it. I also go full throttle a lot so I don't baby it.

[Heaving Earth]

Btw, im almost 100% positive that a 80 amp esc isn't suitable for running 6s on a 1800kv motor. And your turning 39,960 rpms with a stock motor. It'll be fun while it lasts. Ill give you a tip to bring your temps down if you haven't done it already, "y" off your water hose to each the motor and esc and the "y" them back together before the exit hole. Sends cool water to each one instead of heated water from one to the other. Some people don't believe in this, but it does help keep temps a little lower. Check your temps before and after and you'll see.

Y connectors are a no no


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[Rocstar]

Ill give you a tip to bring your temps down if you haven't done it already, "y" off your water hose to each the motor and esc and the "y" them back together before the exit hole. Sends cool water to each one instead of heated water from one to the other. Some people don't believe in this, but it does help keep temps a little lower. Check your temps before and after and you'll see.

Terrible tip, why would you even suggest that? Water is going to take the easiest route and depending on a number of variables, his motor or ESC may not even see much water. If you're going to split water lines, it should only be done in a twin setup with the lines cut to the same length.

[kfxguy]

With all due respect, I tested it both ways and it showed about a 15 degree reduction in water temp in my testing. Im not sure why the y adaptors are a no no but they work just fine for me. What does ose sell y adaptors for?

[kfxguy]

Terrible tip, why would you even suggest that? Water is going to take the easiest route and depending on a number of variables, his motor or ESC may not even see much water. If you're going to split water lines, it should only be done in a twin setup with the lines cut to the same length.

Your over thinking it. Lines cut to same length? We aren't building rocket engines. Im sure you already know this but let me explain something to you. You have water being forced into the rudder. Line runs into the boat. Then y's off to motor and esc. Exit motor and esc. Then y back together and exit the hull. Water is going to go to both places. Are they both going to see the exact same amount of water? Probably not. Are they both going to get cool unheated water? Yes. I don't know about you but me, I'd rather have cool water to both components and not worry about if one get a touch more flow than the other. Like I said, your over thinking it. These are just toys anyway. Nothing serious. Just a way to have fum man.