Electric motor kv / volt / rpm / esc amp calculation

[anthony_marquart]

Can someone please explain all this? I want to understand the motor spec / esc spec / rpm result / all relative to prop size, etc.

Thanks

 

[anthony_marquart]

Also batteries too!

 

[Jerry Dunlap]

Maybe you should start by telling the group what you plan to do. Looking at your post, I see you joined IW in 2003 and have 3,700 posts. Hard to believe you are completely unaware of basic FE specifications.
JD

 

[anthony_marquart]

I have been running nitro for a long time. I stopped running boats for a few years. Moved a couple times and now getting back into it. I decided to go to electric as the motors and batteries are much better now. Against all better judgment I bought a RTR boat. UL-19. Actually like the boat. However something let go on the second run. Details on another thread. Soooo. I’m looking into esc / motor / battery specs and I’m trying to understand how to spec a replacement motor esc combo for the hull.
Ive done a lot of design work for a few of the well know boat suppliers, I won’t go into the details. Jerry I’ve been watching your builds for a long time.
I know nothing about how to pair up an FE boat rig. What I’m looking for is what the specs of each component mean to the power package. A simple excel sht to cover it would be great.

 

[Jerry Dunlap]

Here's what could work to upgrade the UL-19
1. Dynamite 2000 Kv motor
2. A 150 Amp ESC - Lots of choices.
3. A 4S 5000 50C or more battery, again lots of choices - I'm using Graphine Panther 5000 75C in my 1/10 scales.
4. An ABC 1715 would be a good starting prop. - Maybe others will have recommendations.
These things have worked for me on a similar size/power hydros.
Guys running P Limited Hydro could provide info on what works for them.
Offshore Electric is an excellent place to obtain FE components.
Have a Blessed Thanksgiving,
JD

 

[Mike Starrett]

Look up this guy on YouTube. "RCexplained" He has videos on all the tech stuff for rc boats, planes and cars. Bring a notebook, you're gonna need it.

 

[anthony_marquart]

I think I’ve come to a basic understanding. The batteries are on full blast all the time. Speed control regulates power to the motor. If not at full throttle the power / heat builds in the speed control. If too much prop the power / heat can build in both esc and motor. This makes sense to me. I’m not restricted by race rules since just running for fun. Gonna get a larger motor and esc. Lower kv motor so I can run these props. If I want to push it I can prop up a little and watch temps closely.
Rather spend time trimming the boat to run properly and keep it on the water at speed.

 

[LohringMiller]

I wrote a few articles on electrics that may help. Two are in the Propwash below .
http://namba.com/content/library/propwash/2018/April/18/
Lohring Miller

 

[Bruce kafer]

I wrote a few articles on electrics that may help. Two are in the Propwash below .
http://namba.com/content/library/propwash/2018/April/18/
Lohring Miller

That was a great article, I didn't understand all of it but I'm learning

 

[LohringMiller]

At least one and maybe two articles on electrics will be in the next NAMBA Propwash. The recommendation above for the RC Info site is great for a really deep dive into electric power plants.

Lohring Miller

 

[Julio Almazan]

Hi:

... What I’m looking for is what the specs of each component mean to the power package. A simple excel sht to cover it would be great.

I wish that EXCEL page existed !!! ... but the reality is that each thing has several solutions and that the boat (as a whole thing) is the sum of small modifications, trials, trial-and-error ... .and what is more important: How you feel when you navigate with it.
My advice ?, my experience? ... lots of reading on varied specs and many, many, many tests