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Hi Greg,
Looks like a good electrical system over all. However, I would not feel comfortable with fuses in my critical system power line. But, I see that you are routing two power sources to each switch of your critical system which means if one fuse blows due to a transit spike, the other one, hopefully, will not. Again, this is my own personal bias against fuses in critical systems - there are arguments to the contrary for sure.
One thing I did notice, is looking at your injector power switches, I am not certain if these are meant to be the same as Tracy Crook's Injector disable switches. If they are (and they may not be), I do not see the connection that automatically grounds the "cold Start" mode in the EC2 when either injector pair are disabled (turned off).
This may be a detail just not shown on the drawing - but it is crucially important. If the injector power switch does not have the "cold start" grounding provision, then if you ever switch off one of the injector pairs, your fuel flow will drop approx by 1/2 half. The reason is that (with Tracy's recommended switch set up) when you turn off one pair of injectors , that automatically grounds the "cold start" pin which causes the EC2 to double the duration of the PW (Pulse Width) signal to the remaining injector pair. This in turn doubles the amount of fuel from the active pair of injectors. If the "cold start" is not activated (by automatic grounding of the cold start pin through a DPDT switch) when an injector pair is switched off, then the PW signal does NOT double and the fuel flow through the one injector pair will only be 1/2 of what the engine needs.
Ed
Ed Anderson
Rv-6A N494BW Rotary Powered
Matthews, NC
eanderson@carolina.rr.com
http://members.cox.net/rogersda/rotary/configs.htm#N494BW
http://www.dmack.net/mazda/index.html
----- Original Message ----- From: "Greg@itmack" <greg@itmack.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Friday, October 20, 2006 3:33 AM
Subject: [FlyRotary] Re: Powering fuel injectors
I'm trying to keep the number of switched down as well, I attached a pdf
with my schematic which is a work in progress for your review.
I have noted that a lot of builders reduce a lot of this complexity by just
hanging everything off 1 or 2 fuses which is fine until a fuse blows and
then everything stops.
Greg RV8 down under
I am using Z-19 from the Aeroelectric Connection as a guide for wiring
my plane. I would like to power the injectors from the battery buss.
Looking at Z-19, do I need to install a complete switch and diode system
for the injectors like is done for the fuel pump and ECU, or can I tie
on to the fuel pump OR the ECU system after either the switch (add a
separate diode) or after one of the diodes?
There will be the two DPDT switches to disable the primary and secondary
injectors after this connection.
My panel is becoming somewhat switch festooned and I would like to keep
more switches to a minimum.
How have you guys accomplished this?
Thanks.
Bill B
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