brushless 'kv'

[stahlm004443]

sorry im new to brushless but could someone define what kv means? is it the power or rpm or what im clue less?

thanks

[ReddyWatts]

It is the RPM the motor will turn for each VOLT applied to it.

[stahlm004443]

ok so doas that mean that high kv means more power but low speed and vice versa?

[ReddyWatts]

It s little more complex than that. Motors have a max amps, power and voltage rating. If you use a high kv motor it will use more amps than a lower kv motor with the same prop. Weight and type of hull effects the type of motor to use. You need to look at the total watts your setup is using and the amps that it draws. Heat is also a variable that increases with run time. It is real easy to overload something and blow an electrical component. It is a good idea to use a tested setup when you are starting out.

[stahlm004443]

but does that mean that the higher the kv the more powerfull the motor will be? or does it mean that you will have shorter run times with a higher kv motor if you have a small battery pack?

[ReddyWatts]

Yes, higher kv will use more amps with less volts, weight and run times than a lower kv. It will have the same amount of torque as a lower kv in the same size/brand motor. The lower kv will be a more reliable setup since it uses less amps. They will both use the same amount of total power.

watts (times) amps = power.

[stahlm004443]

ok so if i was to use a brushless motor in a 1/10 stadium truck i would get about 3000kv with a 50amp esc? correct me if im wrong?

[ReddyWatts]

Truck??? No experience with that. Maybe someone else can help with your question.

[stahlm004443]

ok but do you think the esc could handle the motor?

[SJFE]

No car and truck esc's do not hold up in marine applications. more when I get home.....

[SJFE]

What exactly are you looking to do? If you want to run a car/truck esc in a boat this is what you have to account for. The specs for those esc's are very inflated. This is because in every case the motor is geared in car's & truck's. So the amps are kept lower. The esc ratings are inflated because of this saftey net. If you where to take a car esc rated at say 150 amps & put it in a boat with a setup calculated for 100 amps. I would bet the farm in less than a minute it would blow. I am a car and truck cross over. In the process of switching to boats I blew every one of my expensive car & truck esc's along with allot of my best 9,10,12 turn motors. It was a hard lesson.

For years boaters where forced to employ motors and esc's mostly designed for land use. This limited the size, run times & most of the fun. Now we are no longer dependent upon that technology. We have a great variety of electronics designed just for us. There are great times to be an electric rc boater.

[stahlm004443]

well i have a fiago 540 can, 3500kv, and max amps is 88a. i want to use this in an E-firestorm with but not sure which esc to get? would a 50a esc work?

thanks

[SJFE]

I don't know anything about trucks. For better information you should try the car & truck forums on rc universe.