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Steve,
Try grounding your external battery to the cable connector at the
installed battery. I'm thinking high resistance ground.
Bobby
-----Original Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On
Behalf Of Steve Brooks
Sent: Saturday, November 21, 2009 11:00 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Need a sanity check
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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