Bobby,
Thanks for going to all this effort.
I will check the switches out.
My switches are mounted just above the PCM
so they are handy for that but I have recently discovered that I wish I had
mounted the PCM close to the throttle. When I need to change the mixture
with the same hand that I have on the stick, things get awkward. :>)
being able to reach up from the throttle with a finger and roll the mixture
would be much better.
Changing the subject a minute…How do
you disable the secondary’s when the engine is staged?? They are
not running anyway???
Bill
From: Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net]
Sent: Wednesday, January 20, 2016
9:29 AM
To: Rotary
motors in aircraft
Subject: [FlyRotary] Re: What do
you think may be happening?
Bill,
The Honeywell Switch
select filters are not working. Go to their site and search on these part
numbers. Spec sheets are available. Both NT and TL “standard”
series switches appear to use silver cadmium. Not sure if that’s a good
thing or if better contact material is available.
Quick Connect
Options:
32NT91-3
2 position DPDT-
32NT91-1
3 position DPDT – center position
is off. I use these but had to add a guard above the switches to
keep from turning them off in flight. I mounted my injector switches directly
below the EFIS knobs.
NT series can be
purchased for $20.00
More expensive
Milspec switches.
2TL91-3
2 position DPDT
2TL91-7
3 position DPDT – center position is off
Bobby
From: Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net]
Sent: Tuesday, January 19, 2016
7:29 PM
To: Rotary
motors in aircraft
Subject: [FlyRotary] Re: What do
you think may be happening?
Dennis,
I discovered today that my secondary
injector disable switch was bad. Flipping the switch gave no continuity
either way. After flipping it back and forth several times, it began to
make a high resistance contact. I guess the movement caused the contacts
to clean off a little.
I am using the Carling S700 series switch
espoused by Bob Nuckolls and sold by B & C. This was a 2-3 switch
that is double pole and is on-on. These switches are pretty
inexpensive…$7.50 each. I was getting ready to order a couple
more switches and got to thinking about it.
The injectors pull pretty high amps I
think pretty close to the switch capacity. Does anyone know how many amps
the injectors pull?
Is there a switch with pretty high
capacity that is on-on with push tabs that I could substitute?
Bobby suggested some Honeywell switches
but they are not on-on and don’t accept the push tabs.
Bill
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]
Sent: Friday, January 15, 2016
10:44 PM
To: Rotary
motors in aircraft
Subject: [FlyRotary] Re: What do
you think may be happening?
What type of switch are you using to disable the primary and
secondary injectors? I was using "rocker" switches and I
found they failed to make good contact - failed "open".
This would turn off the one set of injectors but not tell the computer to
double the on time of the other injectors. I replaced all my
switches rocker switches with "snapping" toggle
switches.
I want to thank Steven Boese, Bobby Hughes and Mark Steitle
for all their help in diagnosing this problem.
I never could make the switch fail during ground run
testing!
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