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Return-Receipt-To: "Bobby J. Hughes" <bhughes@qnsi.net>
Subject: RE: [FlyRotary] Re: Need a sanity check
Date: Sat, 21 Nov 2009 11:17:50 -0600
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From: "Bobby J. Hughes" <bhughes@qnsi.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>

Steve,

Try grounding your external battery to the cable connector at the
installed battery. I'm thinking high resistance ground.=20

 Bobby=20

-----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=20
> 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=20
> battery post or somewhere else in the circuit?
>  =20
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,=20
> EC2 and coil power?
>  =20
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]=20
> 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=20
> intermittent spark when cranking the engine.  Needless to say, it=20
> 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=20
> occasional spark on the front or rear rotor.  Interesting, when I let=20
> 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=20
> issue.  Tracy said that he had seen this symptom a couple of times=20
> before, and it is caused by noise from the starter interfering with=20
> 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=20
> 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,=20
> which was isolated from the airplanes electrical system.  It had good=20
> spark on both rotors .... yeah !!!
>
> So then, I decided to reroute the starter cable on the other side of=20
> the engine, which keeps it away from the other wiring.  I hooked it=20
> 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=20
> EC-2, so I put the spare battery in the back seat (pusher aircraft),=20
> and using some jumper clips, I hooked the EC-2 through a fuse to the=20
> 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=20
> unshielded wires, which were about 12" long.  Same problem.
>
> I am struggling with what to try next.  This problem started before I=20
> swapped the engine, as it was very hard to get started, though for=20
> 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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>
>  =20


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