[NSRCA-discussion] E-power

[Fred Huber]

That works for any eletric motor.

When you load a motor more than what it is rated for, it will TRY to produce 
the power demanded.  If you reduce the demand by reducing the throttle, then 
the motor may be able to get back into its efficient operation range even 
with "too large" a prop load.

If you are experiencing this, you probably have too much prop load on the 
motor and are just making heat.

An excelent example of this is my Hobbico SuperStar EP.  (OK its a little 
E-power trainer type)  It ships with a brushed motor, 2100 mah 7 cell Nicd 
and a 9X5.5 prop.  Draws just over 22 amps static.  I swapped to a 8X4, 
reduced draw to 16 amps, improved durration, quicker take-off and improved 
climb rate.  The 8X4 is probably not the ideal prop (used because it was in 
my box and the 9X5.5 broke)... but the 9X5.5 is obviously not right when you 
can draw less power and get better performance at the same time.

Note that the unloading in the air will be more dramatic with the large 
Pattern plane, but its something to consider.  If you are finding that you 
gain essentially no speed or other bennefit by advancing the throttle beyond 
a given point, you might have the wrong prop.

----- Original Message ----- 
From: "Steven Maxwell" <patternrules at earthlink.net>
To: "NSRCA Mailing List" <nsrca-discussion at lists.nsrca.org>
Sent: Tuesday, April 17, 2007 10:11 PM
Subject: Re: [NSRCA-discussion] E-power


> Do 5 or 6 short flights to form the new batteries.  Don't get me wrong
> here but for just starting out your pushing the limits but your last post
> looks fine 3000's should be good. By pushing I mean for an E newbie, not
> like I have this figured out, my wrost enemy is flying to far out I got 
> out
> to 225 or more with a wind to my back and put back in 2579 MAh
> One of the big things I found with the 5330/F3A is it's real easy to use
> more amps than you need, what I found was after a point there is no more
> power just higher amps not sure why other than maybe the AXI is like a
> torque curve, for lack of a better term, maybe the AXI peaks at say 68 
> amps
> maybe less maybe more, but the thing is if your running more than that,
> whatever that number is you just pushing more amps.
>
> Steven Maxwell
>
>
>
>
>> [Original Message]
>> From: Robert & Casey Green <robcase1 at cox.net>
>> To: NSRCA Mailing List <nsrca-discussion at lists.nsrca.org>
>> Date: 4/17/2007 10:27:49 PM
>> Subject: Re: [NSRCA-discussion] E-power
>>
>> How many flights, should you put a new pack through to break them in?  I
>> charged the first pack that I flew tonight and put back 2300 Mah, the
> second
>> pack looks like it will take 3000 to be replenished, which is about the
> 80%
>> of the pack.  After putting that much back in the pack earlier I am going
> to
>> have to throw these packs away as no good, or do I keep flying them and
> see
>> what happens?
>> Thanks for your responses so far.  I think that I may have enough room
> 10S
>> 5000 extreme.  I am about three ounces over, sure I can find a way to
> make
>> it work for the NATS.
>> ----- Original Message ----- 
>> From: "Duane Beck" <duane.e.beck at comcast.net>
>> To: "NSRCA Mailing List" <nsrca-discussion at lists.nsrca.org>
>> Sent: Tuesday, April 17, 2007 8:06 PM
>> Subject: Re: [NSRCA-discussion] E-power
>>
>>
>> > Robert & Casey Green wrote:
>> >> Don I was pulling 72 Amps, on a 20x13 prop.
>> >
>> > Is that peak static, or unloaded in the air?  I assume those are 20C
>> > packs.
>> > _______________________________________________
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>> >
>>
>>
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