Al,
What type of 15A fuse did you blow?  Not all fuses are created equal.  There are different trip characteristics for use in different applications.   The first letter in the fuse number defines the trip characteristic for 6.am fuses.
A=Fast Blow                -Normally used on resistive loads that do not have inrush currents.  i.e. heaters, illumination.
G=Ultra Fast Blow        -Normally used on sensitive electronics.
M=Time delay                -Normally used on inductive loads to handle starting or inrush loads.  i.e. transformers, motors.

IMO time delay fuses should be used on the ignition coil circuits, they will better tolerate the inrush current as they are inductive loads.  Breakers are often available with different trip characteristic as well, depending on the breaker family.

I would not be suppressed in an application like you described if a AGC15 would trip, but a MDA15 would hold.

Joe





----- Original Message ----- From: "Al Gietzen" <ALVentures@cox.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Thursday, August 31, 2006 12:49 PM
Subject: [FlyRotary] Re: EC2 Current Requirements


I've designed in quite a bit of electrical dependancy, so the
alternator-out running time has me concerned.  With all injectors and
coils on seperate switches, it should be possible to extend the range by
switching off a set of injectors and the trailing coils, and accepting
reduced power.  Does that sound viable?
-------------

I guess you meant "electrical redundancy".

On my 20B install, a 15A fuse blew running 3 LS1 coils.  20A seems to be OK.

Does pulsing two injectors take more current than pulsing one injector twice
as long?

Al


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