[NSRCA-discussion] Going Electric - Battery Questions

[Larry Diamond]

That helps, thanks Patrick. It's about what Mark Atwood stated as well, but
not the specific data points.

 

From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of Patrick
Harris
Sent: Friday, December 07, 2012 5:58 PM
To: General pattern discussion
Subject: Re: [NSRCA-discussion] Going Electric - Battery Questions

 

Larry,

 

OK, here are my SD10G throttle curve settings. Keep in mind, I am currently
running a Jeti 99 with the "linear" curve setting in the ESC. With a HV80
ESC I found I didn't need the ramp to be as steep on the bottom, but pretty
close. 

 

Point 1 = -125

2 = -65

3 = -27

4 = -3

5 = 11

6 = 23

7 = 44

8 = 59

9 = 100

 

This will get you in the ball park.

 

This is in a Nuance, so it's going to be pretty close to your set up. 

On Fri, Dec 7, 2012 at 3:47 PM, Ed Alt <ed_alt at hotmail.com> wrote:

True.  They will also discharge faster.

Ed

-----Original Message----- From: Duane Beck
Sent: Friday, December 07, 2012 6:40 PM
To: Larry Diamond ; General pattern discussion


Subject: Re: [NSRCA-discussion] Going Electric - Battery Questions

The higher C packs will have lower internal resistance, which means they'll
maintain a higher voltage under load.  Higher voltage means the same motor
with the same prop will draw more current.  More voltage * more current = a
lot more power (W = V * I).

Duane

----- Original Message -----

From: "Larry Diamond" <ldiamond at diamondrc.com>
To: "General pattern discussion" <nsrca-discussion at lists.nsrca.org>
Sent: Friday, December 7, 2012 6:17:47 PM
Subject: Re: [NSRCA-discussion] Going Electric - Battery Questions
Interesting point... I don't understand how changing from 20C to 40C
pack makes a difference using the same Motor and ESC combo. If it's
battery heat, my electronics background would tell me the pack is
probably being dicharged too deep. Not good for the life of a battery.

I suspect the result of not changing the Motor/ESC and only changing
the battery will reult in a shorter battery life; and, over loading
the power plant which will probably result in damaging the ESC and/or
the Motor.

I could be wrong, cause I really have no experience with electric
power set ups in planes. I just don't understand the logic going from
20C to 40C and the result being "too hot for intermediate".

It wouldn't surprise me to see Masters or FAI having a higher power
set up, like 3,500 to 4,000+ watts. Then depending on the max current
draw,  40C may make sense.

My set up will be about 2,700 to 3,000 watts based on specs... It may
not be sufficient for Masters or FAI.

Perhaps this will turn out to be a good constructive discussion for a
number of people like me, but I'm curious as to other opinions who
have practicle knowledge.

Larry Diamond

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