[NSRCA-discussion] Electric Power Consumption

[George Miller]

So less prop = less current draw?  OK, thanks Dean.

It may be a very nice paper weight :(


----- Original Message ----- 
From: "Dean Pappas" <d.pappas at kodeos.com>
To: "NSRCA Mailing List" <nsrca-discussion at lists.nsrca.org>
Sent: Tuesday, January 10, 2006 10:34 PM
Subject: RE: [NSRCA-discussion] Electric Power Consumption


> Hi George,
> The answer is less prop, but as Adam said, if you have fried the magnets 
> in the motor with the overcurrent running you've gone through, then the 
> motor will pull excessive current on any useful prop.
> Dean
>
> -----Original Message----- 
> From: nsrca-discussion-bounces at lists.nsrca.org on behalf of George Miller
> Sent: Tue 1/10/2006 10:20 PM
> To: discussion at nsrca.org
> Cc:
> Subject: [NSRCA-discussion] Electric Power Consumption
>
>
> I have a problem with an electric conversion which while not precisely 
> pattern related, I'm sure will be applicable to electric pattern 
> problems...so I'll ask it here.
>
> I am trying to convert a Showtime from YS 110 4 cycle power to electric 
> power.  After looking around the web, I got an Actro 32-3 - which is a 
> popular motor for the Ion electric helicopter.  I know that this motor 
> runs well with available ESC's on 5S4P lithium packs, so I set it up with 
> a 17X12 APC e prop and a 77amp ESC from Hobby Lobby  ( esc and prop 
> recommended on their website).    To make a long story short, the ESC 
> litterally burned up 30 seconds into the first flight....but BOY WHAT 
> POWER for that 30 seconds<G>!!!
>
> OK, so I'm thinking that burning up probably indicates a problem.....and I 
> start to investigate...I hook up a watts-up to my Focus II with a 
> Plettenberg 30-10 and a 21X12 APC and it pulls about 65 amps at full 
> throttle on the bench....Then I set up the Showtime and it tops 75 amps at 
> half throttle!! HMMM, so there is the problem....Now I try to make changes 
> to decrease the amperage -- larger prop and smaller prop---no major 
> change, then I tried just using a 5 cell pack cutting voltage in 
> half...still about the same....so the question is:  How do you adjust the 
> current drawn by an electric motor?  Can this set up be salvaged...Where 
> did I go wrong and how can I avoid this in the future?
>
> TIA for your help and the benefit of your experience!
>
> George
>
>


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