[NSRCA-discussion] Electric Power Consumption

[George Miller]

Thanks, Adam,  I am learning.

I just got the wattmeter and didn't have it last weekend when this 
happened....learning what tools to have as well.

Thanks,

G

----- Original Message ----- 
From: "Adam Glatt" <adam.g at sasktel.net>
To: "NSRCA Mailing List" <nsrca-discussion at lists.nsrca.org>
Sent: Tuesday, January 10, 2006 9:40 PM
Subject: Re: [NSRCA-discussion] Electric Power Consumption


> It could be that the magnets have been demagnetized in the Actro, George. 
> Avoid this in the future by starting with a copy of someone else's power 
> system, and using the wattmeter the first time you power up, and every 
> time you make a change.
> -Adam
>
> George Miller wrote:
>> 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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