6cell or 8 cell with my set up

[Engelkefarm]

I have sk180esc and turnagy 4084 1500kv in my genesis I have been running it with 2x 3 cell 5000 mah 35c venom. Timing on esc is 11.xx. I am getting about 40-45 mph speed and it seems like the motor is only running about half of its potential. It's just not screaming like it should. I have tried to recal the throttle a couple times with same results. Does the motor just want more amps possibly? I am nervous to try 8 cell on the sk. I am thinking just ordering a leopard is my cheapest solution to get it moving a little faster. Any advice would be great.

[Brushless55]

I would stick with 6s on that KV
what prop are you running?
and welcome to OSE !

[blowNover]

I don't know about anyone else but I can tell you first hand my sk180 didn't like me adding cells beyond 6s.

[Brushless55]

yeah didn't think of that one

[martin]

The SK 180 is a 6s esc (that's why the specs say 6s), I know a few have pushed to 7s. That also is not an 8s motor @ over 44000rpm unloaded, you need to look at problems with your boat set up as you should be seeing a lot more than 40-45mph.

[Engelkefarm]

I have a x442 it takes off with that. And also a grim racer l45x68 takes a second to plain but then takes off and I get a better top end. Honestly I think it is the motor the 3 wires coming off are real thin and I think they are restricting the current flow. All other wires are 10awg it is riding perfect in the water nice and flat. Anyone have experience with the aqua star 4084? I will post some pics if someone will explain how

[Rumdog]

No, it isn't the motor at all... Its the tiny prop!

[Engelkefarm]

As I stated in post above I have two props a 42 and a 45. Anything larger than the 45 would take to long to plain out. And I doubt I would get 10+mph out of a little larger prop. Also if the prop was way too small motor would just be over reving and that's my problem I feel like its not maxing out at wot. If I were to take a guess I would say its spinning at about 3/4 rpm And every connection has a 5.5 bullet. Just got nano tech 5000 mah 65-130 c. They seem to give me like 2-3 mph possibly. And just to leave the bs out of it I work on tractors cars trucks real boats you name it. It's just the electricity part that has me thrown off

[Rumdog]

A larger prop will plane faster. It has to be the correct prop though. And yes, you can easily gain 10 mph with a prop change. Think of it this way.. you have all that motor, right? Now consider that an Aquacraft ul-1 motor can easily turn that prop. That motor isn't even breaking a sweat, therefore, it's not really making any power.

[Engelkefarm]

A larger prop will not plane faster if you do not have the power torque. A motor will run hot if its either not enough strain or too much. Now I am not sure of the pitch on the grim racer. A electric boat should not take very long to plane out. I have the strut up as high as it will go and flat on the table

[Engelkefarm]

Well what prop do you suggest we will start process of elimination. Don't get me wrong it's fast but I feel like it should be running faster

[Peter A]

Are you guessing the speed and rpm? About xx speed is not the same as measuring it to be fair. Also with that setup you could run a like x447/3 without heating issues. A small prop won't sound like it's revving, try a bigger prop.

[Engelkefarm]

I GPS the speed 39.7 mph on the x442 did not GPS other prop. But if it is taking long to plane on a 2 blade 45 why would I run a 3 blade 47? It would just take even longer to plane. Is it normal to take 2-3 seconds to plane out? Do the larger motors just take a minute to get rpms up compared to a smaller higher kv motor? I just don't want to be wasting money on props that are too big or too small.

[Engelkefarm]

It basically dose not have the snap off the line with bigger prop that I had expected. I believe the motor will have no issue turning the larger props but at the expense of the low end. The grim racer prop is a lifter prop by the way.

[madmikepags]

I think I might have figured out the problem according to the HK site I can not find a 4084 with a 1500kv the one listed is a 1050KV that would make a WHOLE LOTTA difference. Instead of turning 33,000rpm like you think you are, you are actually only turning 23,000!!!!!