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Power Systems Talk about motors, ESC speed controllers, gear drives, propellers, power system simulators and all power system related topics

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Old 06-06-2017, 08:13 AM   #1
Flora
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Default What is the required ESC amps for your motor?

What is the required ESC amps for your motor?

20 amps ESC can be used for 2205 2300kv motors with 5 inches propellers. They are also compatible with motors that smaller than 2205 or slower than 2300kv. For example 2204 2300kv, 2206 1900kv (with 5 inch propellers).

If you are using 30amps ESCs, you should choose motors that are bigger than 2205 or faster than 2300kv, and propellers should be bigger than 5 inches. For examples 30 amps is required for the 2204 2700kv, 2204 3200kv, 2205 2700kv or 2206 1900kv(with 6 inch propellers).

35 Amp ESCs is required when you are using 6s lipo battery for your rc model.

and if you need 30 A ESC, you can view this review of Tattu ESC.


Germany shop
: http://www.gensace.de/tattu-esc-30a-...type-1161.html

USA Shop: http://www.genstattu.com/ta-esc-30a-4pcs.html
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Old 06-06-2017, 01:16 PM   #2
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?? I fit with a margin of at least 30% over what wattmeter tells me is max of motor / prop / LiPo combo.

Nigel

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Old 06-06-2017, 01:39 PM   #3
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If only it were that simple. I could use a 35 amp ESC on my plane with a 6s pack and 1000 watt motor with a 14" prop.

I like smoke, but only when I BBQ.

What goes up, must come down. The trick is to keep it in one piece.
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Old 06-06-2017, 02:49 PM   #4
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Originally Posted by Flora View Post
What is the required ESC amps for your motor? ...
Alas, you have simplified things too much, bordering on wrong.

Motorcurrent is proportional to pitch, proportional to voltage squared, proportional to Kv cubed, and proportional to diameter⁴.

About derating motors, controllers, batteries, electronics in general:Vriendelijke groeten Ron

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Old 06-06-2017, 04:38 PM   #5
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"35 Amp ESCs is required when you are using 6s lipo battery for your rc model."

Not very helpful

I have motors that can pull 40A on 4 cells.

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Old 06-06-2017, 06:19 PM   #6
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Have a guess what my 222kph Parkjet pulled on 4S and 4400kv with 5x5 prop !!

Nigel

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Old 06-07-2017, 01:08 AM   #7
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I think this member is affiliated with a shop. Three posts, all showing some new battery, ESC, etc. All with links to buy.

What goes up, must come down. The trick is to keep it in one piece.
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Old 06-07-2017, 07:18 AM   #8
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Originally Posted by Stay Quiet View Post
I think this member is affiliated with a shop. Three posts, all showing some new battery, ESC, etc. All with links to buy.
I realised that on first reading ....

I hope no newbie reads and follows it !

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Old 06-07-2017, 08:06 AM   #9
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You start with the motor because it’s where all the performance comes from, and it dictates which power setup you’ll need. In this article, I refer only to brushless outrunner motors. You have to determine your model’s power requirements. Some manufacturers, e.g., electrifly.com, now make this easy because they have online programs to help you select the right motor.
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Old 06-07-2017, 10:08 AM   #10
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Hang on ... do we have ONE poster with TWO ID's ?

FLORA and babyishcare ?

Nigel

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Old 06-07-2017, 03:25 PM   #11
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Agree.

Both new on 6/1, both on the same script.

Its adios time.

Science has proven that six out of seven dwarves are not Happy.
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Old 06-07-2017, 03:57 PM   #12
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Originally Posted by babyishcare View Post
You start with the motor ...
You start with the plane and how you want to fly it, that will give you a prop and an rpm, that will give you a motor.
Originally Posted by Abuelo View Post
... both on the same script. ...
What do you mean by that? Can you see more than us plain Wattflyer grunts?

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Old 06-07-2017, 04:13 PM   #13
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Ron ...

"What do you mean by that? Can you see more than us plain Wattflyer grunts?" ...

It refers to my saying FLORA and babyishcare are same person ...

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Old 06-07-2017, 04:57 PM   #14
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Ron,

To me, babyishcare's posting is a continuation of Flora's. The fact that both posters joined the forum the same day plus their shared views point to they being the same person.

Perhaps an Admin can check their IP addresses to see if the posts came from the same machine.

Abuelo

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Old 06-07-2017, 06:56 PM   #15
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Originally Posted by babyishcare View Post
You start with the motor because it’s where all the performance comes from, and it dictates which power setup you’ll need.
That's wrong. To do the job properly you start with the prop because it's the prop that actually provides the thrust (as a general rule for maximum efficiency you pick the biggest prop practical for your airframe). Knowing the prop diameter you work out pitch and RPM to give your pitch speed and thrust. This gives you the motor Kv and battery voltage and power required to spin that prop at that RPM. Test data such as found on the APC web site is really useful for prop selection: https://www.apcprop.com/v/PERFILES_W...tDatafiles.asp

Only now you can go select your power system.

You cant start with the motor because how would you know Kv or power rating without considering the battery or the prop?

To be honest though in most cases the hardware is selected based on experience, so you just pick something that you know works on similar models, nothing wrong with this method.
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Old 06-07-2017, 09:38 PM   #16
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Originally Posted by Abuelo View Post
Ron,

To me, babyishcare's posting is a continuation of Flora's. The fact that both posters joined the forum the same day plus their shared views point to they being the same person.

Perhaps an Admin can check their IP addresses to see if the posts came from the same machine.

Abuelo
I doubt the Admin's. will find identical IP addresses.......I believe this site has defaults that prevent multiple user names on the same IP.

More than likely, we've seen the last of "them/him/her" given the responses to a bunch of uninformed questions and statements.........a third attempt by the culprit will surely vibrate the chairs of a few Admin's. here.....
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Old 06-09-2017, 12:45 AM   #17
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Originally Posted by solentlife View Post
Ron ... "What do you mean by that? Can you see more than us plain Wattflyer grunts?" ...
It refers to my saying FLORA and babyishcare are same person ... Nigel
I thought that maybe Abuelo ment to say the had some handy script to do checks.

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Old 06-09-2017, 03:38 AM   #18
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A script is the words to a play or movie, that the actors read.

By saying both are on the same script, he just means they are basically saying the same thing.

It's not some fancy admin magic, or a program.

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Old 06-09-2017, 04:18 PM   #19
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Ah, that script, merci.

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