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-   -   New warning insert in MMM box: "DO THE MATH!" (https://www.rc-monster.com/forum/showthread.php?t=22665)

What's_nitro? 08.02.2009 08:08 PM

Quote:

Originally Posted by skellyo (Post 309477)
What this means it that now any users of MaxAmps packs will be more confused than ever! Since MaxAmps only specifies a surge rating now, users will have no logical way to do the math on the Castle insert.

It's like Briggs & Stratton using "gross torque" on their engines instead of HP because THEY think it is a better way to rate the engine...... No other company uses that method... :grrrrrr: So it makes it much harder for consumers to compare different brands.

fastbaja5b 08.02.2009 08:54 PM

Well I run IB 5000mah 40C packs, 40C being the stated constant rating, so 200 Amps, my eagletree has shown a max amp spike of 121 amps from the Savage Flux so I have a 40% buffer.

I can live with that :)

emaxxnitro 08.02.2009 08:55 PM

maxamps 60c? what a lie

Andrew32 08.02.2009 09:00 PM

Quote:

Originally Posted by Metallover (Post 309518)
Not too many people would run a 1515 sized motor with a MM either. The MMM just deals with more power.

only us crazy mofos do it :lol:




im really enjoying these turn of events the last few days:intello:

JThiessen 08.02.2009 09:15 PM

I havent been into the calculators in a while, so is there a way to have it also calculate maximum amp draw based on motor and gearing? It might already be there....just havent looked.

Pdelcast 08.02.2009 11:44 PM

Believe me, there are a lot of people trying to run 15C 3200mah packs... /sigh

BrianG 08.03.2009 12:05 AM

Quote:

Originally Posted by JThiessen (Post 309558)
I havent been into the calculators in a while, so is there a way to have it also calculate maximum amp draw based on motor and gearing? It might already be there....just havent looked.

No such thing yet. Even with specifying gearing and such, there are simply too many variables to consider to be anywhere near accurate. The best you can do is estimate average current draw by your runtime and battery capacity figures, and then estimate burst current by multiplying the average current by 6-8.

Quote:

Originally Posted by Pdelcast (Post 309590)
Believe me, there are a lot of people trying to run 15C 3200mah packs... /sigh

On the next version of your ESCs, incorporate a mechanical fist that comes out and punches the user if they try to use such packs. :smile:

jhautz 08.03.2009 12:12 AM

Seems if you want to spec a minimum capable battery for an esc, there should be some standard to defining a batteries performance. Anyone can write anything they want on the side of a lipo and have people buy it these days. Sure makes it hard for the consumers to wade thru the muck when the ESC manufacturers are saying minimum rating of a battery needs to be one thing, except for some brands that arent good no matter how they are rated, and the leading lipo pack builder has stopped using those rating standards all together.


Wait a minute.... What did I just say? :neutral:


I don't get it anymore. I liked the days of figure it out yourself, burn a few things up and eventually you learn what actually works.

pinkpanda3310 08.03.2009 09:02 AM

Quote:

Originally Posted by BrianG (Post 309598)
No such thing yet. Even with specifying gearing and such, there are simply too many variables to consider to be anywhere near accurate. The best you can do is estimate average current draw by your runtime and battery capacity figures, and then estimate burst current by multiplying the average current by 6-8.



On the next version of your ESCs, incorporate a mechanical fist that comes out and punches the user if they try to use such packs. :smile:


Is that why you haven't included this on your calc sheets?http://www.rc-monster.com/forum/show...motor+amp+draw

JThiessen 08.03.2009 09:05 AM

Quote:

Originally Posted by BrianG (Post 309598)
No such thing yet. Even with specifying gearing and such, there are simply too many variables to consider to be anywhere near accurate. The best you can do is estimate average current draw by your runtime and battery capacity figures, and then estimate burst current by multiplying the average current by 6-8.



On the next version of your ESCs, incorporate a mechanical fist that comes out and punches the user if they try to use such packs. :smile:

:diablo: Just figures.....sometimes looking at all these electrical numbers gives that feeling of doom I had 20 years ago in my EE and EEET classes in college. If it weren't for HP calculators, I would never had made it through those classes.:sleep:

BrianG 08.03.2009 09:58 AM

Quote:

Originally Posted by pinkpanda3310 (Post 309663)
Is that why you haven't included this on your calc sheets?http://www.rc-monster.com/forum/show...motor+amp+draw

Well, there are a couple reasons I didn't add that (yet):

- I forgot about it :smile:
- No feedback.

Quote:

Originally Posted by JThiessen (Post 309665)
:diablo: Just figures.....sometimes looking at all these electrical numbers gives that feeling of doom I had 20 years ago in my EE and EEET classes in college. If it weren't for HP calculators, I would never had made it through those classes.:sleep:

I still have my trusty old HP48gx, with a whopping 512k RAM card. lol.

whitrzac 08.03.2009 03:26 PM

Quote:

Originally Posted by What's_nitro? (Post 309532)
It's like Briggs & Stratton using "gross torque" on their engines instead of HP because THEY think it is a better way to rate the engine...... No other company uses that method... :grrrrrr: So it makes it much harder for consumers to compare different brands.


no, they do it to hide the fact that they can't make power...:lol:

suicideneil 08.03.2009 04:25 PM

I like this latest development, its a kick in the teeth for noobs and those who mislead noobs. If your lipo puffs, then you know the manufacturer mislead you on its ratings/capabilities. If it doesnt puff, then its all gravy.

I think the 80amps minimum thing applies to mild setups though, rather than extreme setups (same reason for having mild gearing with nimhs and nicads).

RBMike 08.03.2009 04:32 PM

People need to start thinking about the power systems as just that "SYSTEMS". The ESC, Motor ,Battery & gearing are the system. The components of the SYSTEM are individual peices that need to be suitable for use with each other.

You would not go down to tire rack & get a set of subcompact car tires and expect them to work on a Boeing 747-400. Yes I know the 747 uses tires, but not ones ment for a corrola.

So yes, we all need to do the math.

TexasSP 08.03.2009 07:09 PM

Your right, the Boeing 747 tires cost as much as a corolla.


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