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From: "Joe Ewen" <jewen@comporium.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
References: <list-1844418@logan.com>
Subject: Re: [FlyRotary] Re: CBs and fuses
Date: Sun, 18 Feb 2007 10:10:02 -0500
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John,

Here is some load data I have gathered:
*Total Load
One builder reported that his 13b pulled a total load of 12 Amps while 
operating.
*Coils
Tracy answered one of my questions by saying the coils can pull 8 amps if 
they saturate but normally pull much less.
A builder ( Al G. I believe) had a 15A fuse on his coils (3coils, 20b 
engine) blow.
I am protecting my coil circuits (Pri and Sec on a 20B) at 20 amps.  Not 
running yet.
*Injectors
Per Tracy max current draw on the injectors is 2 amps.
*EC2
Per Tracy the current draw in the EC2 is 0.25 amp.
*EM2
No data on the EM2, since I have built my own on board computer for engine 
monitoring, AHRS, systems monitoring/alarming, moving map and EFB etc.

I am curious what PTCs you are using.  I used PTCs on some circuits. I used 
a Buss ATC form breaker, removed the bimetallic and soldered a PTC to the 
frame.  Then plugged into a ATC fuseblock.  This worked well, bit I am 
curious if you found a packaged PTC.

Thanks,
Joe


----- Original Message ----- 
From: "John Overman" <mooneydryver@yahoo.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Saturday, February 17, 2007 7:15 PM
Subject: [FlyRotary] Re: CBs and fuses


> Al or anyone, speaking of fuses, I'm about to order
> PTC resettable fuses in my Velocity, and haven't been
> able to find any load values for the stock mazda
> coils, the fuel injectors, the EC2 or the EM2, Al as I
> recall you are using LS1 coils not Mazda but I haven't
> come up with anything. I even looked in the RX7 manual
> to see what size fuse Mazda used. It just says the
> fuses are listed under the cap.
>                        John Overman
>                        Velocity RG N711VE (reserved)
>
>
>
> --- Al Gietzen <ALVentures@cox.net> wrote:
>
>>
>> There certainly reasons for either CBs or fuses, and
>> I have both in my
>> plane.  For my flight critical circuits I opted for
>> simple, fault tolerance
>> and fuses.  I wouldn't argue with someone making a
>> different choice.
>>
>>
>>
>> FWIW,
>>
>>
>>
>> Al
>>
>>
>
>
> --
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>