Darn...no over-volting the Monster

[DrKnow65]

Speedy, I'll let the Electrical Engeneers chime in here, but I do not argee with your math.

While you are correct about the "internal resistance" being half between the 2000kv and the 1000kv, that is not a direst equation to what you get in watts lost as heat. I will not get into thermo dynamics, but here is an example, the entire car industry, all around the world, switched their electrical system from 6volts to 12 because it made the components last longer and not heat up as much. Amp draw is what creates heat in a circuit, not voltage or even watts. A 120,000volt power line is not hot without a load. Less amps is less loss, that is a fact.

[lutach]

SpEEdyBL,

Not only we have a few members here and myself, who are running HV, we can back any statement said. We have real world experience and I can't find where the heat is generated to cause the same loss you've mentioned. From what I know (I'm not an engineer) when electronics are subjected to high heat, they become less efficient and that can be seen in any Electronic Component being Active, Passive, Electromechanical and Interconnect. Look at some datasheets of and you will see that a MOSFET will perform better at a cooler temp. then at a higher temp. The only thing that I've seen perform good when heated to a safe high temp is lipos. SpEEdyBL, have you done a HV conversion? If not please do so, but thinking of a speed machine, but a well geared racing set up. BrianG's calculator is a great tool and I use it a lot. Now John knows how a high turn motor acts in producing torque in rock crawling. I would like to see how a high Kv motor does in rock crawling.

[lincpimp]

Not being an enigineer at all, I had the same view about the benifits of hv. Heel, I bough my first lipo chargwer thinking there was no way I would ever go past 4s lipo. Well, I have built many vehicles, and even going from a 4s to a 5s setup makes a world of difference to me. I have done afew 6s setups, but have not really tested them much, as my quark escs are not too fond of 6s, but the MMM should help with the testing.

I have the 8s savage, and a 4s revo. The savage is heavier than the revo, both run the same diameter tires. The revo has a 7xl, the savage has a 14xl. So kv on the revo is 2300 or so, and the savage is around 1200kv. I run 3600 12c lipos in the savage and 4900 25c lipos in the revo. The revo produces more heat, on the motor and esc. The savage gets to about 140-150 on the motor, esc does not get more than 110. Depending on how hard I run the revo, the esc will thermal, and the motor can beat 160. Te revo has more airflow over the equipment than the savage too. Most people have heat issues with the feiga motors, they are cheap, so you get what you pay for, IMO.

Is there a specific reason that you do not like the idea of a hv setup? I find that the lipos are not pushed as hard, and therfore have more punch longer thru the run. This and lower temps are the main things I see with the hv setup.