Mailing List Message #63366
From: Bobby J. Hughes <>
Subject: RE: [Fly Rotary] Re: F/A and EGT data
Date: Mon, 15 May 2017 10:06:24 -0500
To: Rotary motors in aircraft <>

I should have said pulse shape. Possibly the injector is not closing as
quickly because of some minor load from the engine monitor.


-----Original Message-----
From: Rotary motors in aircraft []
Sent: Monday, May 15, 2017 8:05 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: F/A and EGT data

Bobby, that 2k resistor should not affect the pulse width; it's purpose
is to provide parallel instruments with an isolated sample of the
pulse-width to determine rpm and fuel flow.  Will be interesting to see
what your test reveals.

From:   Bobby J. Hughes <>
Subject:        Re: [FlyRotary] Re: F/A and EGT data
Date:   Sun, 14 May 2017 12:46:00 -0400
To:     Rotary motors in aircraft <>
        Message Header

Yesterday I remembered my rotor 1 primary injector has a connection to
the EC3 for fuel flow and AFS engine monitor for RPM. I believe I place
a 2k resistor between the injector and AFS and possibly the EC3. This
may be affecting the pulse on / off time when manually changing the
mixture. I'll test by disabling the primary injectors at a stable rpm,
manifold pressure and F/A while observing EGT's.

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