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Message-ID: <4B081C98.7010700@gmail.com>
Date: Sat, 21 Nov 2009 12:00:08 -0500
From: Steve Brooks <cozy4pilot@gmail.com>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: Need a sanity check
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Bobby J. Hughes wrote:
> Steve,
>
> I removed the battery cable running to the starter, and using a spare
> battery, and a jumper cable for the ground, I cranked the starter with
> this battery, which was isolated from the airplanes electrical system.
> It had good spark on both rotors .... yeah !!!
>
> How did you jumper the ground? Was it connected at the installed battery
> post or somewhere else in the circuit? 
>   
I used a set of jumper cables to connect the negative side of the spare 
battery to the mounted plate of the reduction drive, where the starter 
is mounted.

> Have you tried isolating all electrical circuits except the starter, EC2
> and coil power? 
>   
No I haven't done that, it would be fairly easy to do though.  I'll give 
that a try.

Steve
> Bobby
>
>
>
>
> -----Original Message-----
> From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On
> Behalf Of Steve Brooks
> Sent: Saturday, November 21, 2009 9:50 AM
> To: Rotary motors in aircraft
> Subject: [FlyRotary] Need a sanity check
>
> I have been working on an issue for three weeks now, with very
> intermittent spark when cranking the engine.  Needless to say, it won't
> start either.
> I have a spark plug out of each rotor, and have them clamped to a good
> ground, so that I can see a spark on the front and rear rotor.
> If i rotate the CAS by hand, or turn the prop by hand, I get good spark.
>
> When cranking with the starter, I get an initial spark, and then an
> occasional spark on the front or rear rotor.  Interesting, when I let
> off the starter, I get a couple of good sparks as it coasts to a stop.  
> Both controllers do the same thing BTW.
>
> I had emailed Tracy, as at one time I thought that the EC-2 had an
> issue.  Tracy said that he had seen this symptom a couple of times
> before, and it is caused by noise from the starter interfering with the
> CAS signal.  He suggested that I install a 1K resistor across each of
> the crank angle sensors.  I installed the resistors, but it did not cure
> the problem.
>
> This morning, determined to get to the bottom of this, I removed the
> battery cable running to the starter, and using a spare battery, and a
> jumper cable for the ground, I cranked the starter with this battery,
> which was isolated from the airplanes electrical system.  It had good
> spark on both rotors .... yeah !!!
>
> So then, I decided to reroute the starter cable on the other side of the
> engine, which keeps it away from the other wiring.  I hooked it back up
> to the aircraft battery, crossed my fingers and cranked the started.  
> Same problem.   I thought that perhaps the noise was getting into the 
> EC-2, so I put the spare battery in the back seat (pusher aircraft), and
> using some jumper clips, I hooked the EC-2 through a fuse to the
> isolated battery.  Same problem.
>
> I had extended the CAS wiring when I replaced the engine, so I decided
> to reroute the shielded CAS wiring, so that I could eliminate the
> unshielded wires, which were about 12" long.  Same problem.
>
> I am struggling with what to try next.  This problem started before I
> swapped the engine, as it was very hard to get started, though for three
> years prior to that, I had no issues, and it started easily.
>
> Has anyone else seen this type of problem, or have any suggestions ?
>
> Steve Brooks
> Cozy MKIV 13BT
>
>
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