Obsession with 6s

[Simon.O.]

One thing I have to say time and time again as I bang my head on a wall
Cell count does not automatically equal power
Cell count is volts
Amp draw plus volts eqauls power VxA=W

What I am saying is that I go for a higher cell count and lower kv to get the desired power, it is easier on all of the component of the power system right up to the coupler and then it is nominal.
The coupler, shaft and prop do give to monkeys nads what is spinning is as long as there is enough power and rpm coming down the line.

I am done with high amps and low volts, just too much heat and stress.

I am near through with having to explain this so often.

If some bell end sets up his new boat and smokes it without doing some reading and a little asking then I have very little sympathy! If that sounds harsh then I apologise now......do some reading !!

[Brushless55]

Most of us understand, but because of marketing I believe some of the new guys will be turned away by all the smoke...

[Alexgar]

I agree with Simon lv high voltage is great but not out of a rtr or budget build nice lipos motor and escs cost money there is no cheap way to a fast vessel planning and experience is worth more than the 800+ I spend burning down my pride boats

[Diesel6401]

Bump

[MSTHTD]

I have a boating buddy that embodies this principle, and the guys at the lake call him "Mr. Rowboat" ' cause he has to row out to retrieve his boats just about every time he gets them in the water.

Kind like this---> That just made my night, Thanks Properchopper!

[mrfabrications]

want to make sure i get this right 2200kv on 4's should get me to the sweet spot of 30000rpm?

[sailr]

3.7V per cell x 4 cells = 14.8V x 2200/rpm per volt (KV) = 32,560 NO LOAD RPM

I run the NEU 1515 1Y (2200KV) on my P Mono using an X447/3 prop. She screams!

[Steven Vaccaro]

I have a new word to use for you compulsive voltage freaks, "Voltageria" = "the act of over volting and under amping your toys".

[Diesel6401]

I normally do a range...

3.7 is nominal and 4.2 is fully charged. so i go:

3.7 x 4 = 14.8 and 4.2 x = 16.8

range would be

32,560 - 36,960 unloaded rpm that's just how I do it.

[mrfabrications]

Thanks wanted to make sure I had the formula right

[electric]

Always enjoy these threads. It took me a while to finally get a grip on the whole topic and after burning up some esc's and motors I finally got a handle on the whole equation. That said, for some people, who are not engineers, it does take awhile and some experiences to have it all make sense. Not fogetting the whole prop disussion. So patience is required.

I did see something earlier in the thread which is a "different" way of thinking of it for me, but makes perfect sense.

Watts = Power. So, I don't think I have seen a chart that also suggests what is a good wattage to have for a typical boat. Something like you need 1/2 horsepower (in watts) for small boat and 4hp (Watts) for a bigger boat. So rather than only looking at rpms (volts) you are also considering how much power you need. I know that is implicit in the charts that shows cell count and rpm's to some degree, but it might help others grapple with the equation of backing into what they need for a boat? Hope that made sense... Chuckle.

Added: So, given we know the optimal rpm range based on the chart(volts), what is the optimal amps that should be pulled to get the corrrect watts that are needed for a given sized boat...

[electric]

If you look at the chart provide, it would be neat to add into that chart a suggested amperage range and boat size range as well. This is to Jay's point of running a supervee at 50mph..there is a point where the watts/horespower become too much for the boat...

And..then lay on top of that watts to horsepower, since most people have an easier understanding of horsepower.

[petej]

Thank you Properchopper for making this terrific chart and Diesel6401 for posting it.

As a FE newbie, I have an MG with the stock 1500kv motor, Turnigy 120A ESC, 1.6" dia Pro Boat SS prop and typically run 5s, 30C or 40C batteries. After a run, the motor, ESC are always cool, but the series ESC, battery connections get quite hot.

Question: How do you estimate or calculate the current (amps) a configuration or setup will draw?

Pete

[Boaterguy]

People want to run low voltage on high Kv motors, because they are cheaper, but running the same rpm's on a lower Kv motor with higher voltage will result in less anp draw, and more torque, resulting in less rpm's lost under the water. I agree with everyone wanting to run 6S being a bad thing, and some people know what they are doing, like the SAW guys who push the limits of their equipment.

[Dustin Sontag]

Everybody that buys my Micro boats is obsessed with wanting to run them on 4S. All they do is create an uncontrollable boat and burn everything up. I try to warn 'em but whatcha gonna do?

lol and here i am trying to break a speed record running mine on 6s and 120 amps. Still cant believe that my stock motor is holding up!! Torque roll is a real problem at this stage, but it sure is fun!

i have had more fun with my little boat than any of my gas or nitro boats.