X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [66.219.56.245] (HELO mail.qnsi.net) by logan.com (CommuniGate Pro SMTP 6.0c2) with ESMTP id 5865783 for flyrotary@lancaironline.net; Tue, 06 Nov 2012 22:07:49 -0500 Received-SPF: none receiver=logan.com; client-ip=66.219.56.245; envelope-from=bhughes@qnsi.net Received: from 10.0.0.5 ([10.0.0.5]) by qnsi-mail.qnsi.net ([10.0.0.5]) with Microsoft Exchange Server HTTP-DAV ; Wed, 7 Nov 2012 03:07:15 +0000 Content-Type: multipart/alternative; boundary="Apple-Mail-8EAA502E-B3B5-4B08-8888-729F91CFC8B9"; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Subject: Re: [FlyRotary] Re: Renesis CAS & EC-2 upgrade? References: From: "Bobby J. Hughes" In-Reply-To: Message-ID: <17009152-BE3E-435C-8A9E-E57347754DBC@qnsi.net> Date: Tue, 6 Nov 2012 21:07:16 -0600 To: "Rotary motors in aircraft" thread-topic: [FlyRotary] Re: Renesis CAS & EC-2 upgrade? thread-index: Ac28lP1TbbeELzfiTrOxoEVlexTN/g== MIME-Version: 1.0 (1.0) --Apple-Mail-8EAA502E-B3B5-4B08-8888-729F91CFC8B9 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: quoted-printable Steve Without the resistor, the eleven unwanted pulses that go below zero are also= inverted. With the resistor they stay positive and are almost eliminated. Y= ou could see if CAS #2 is causing interference by removing the resistor from= CAS #1. =20 Bobby Sent from my iPad On Nov 6, 2012, at 7:53 PM, "Steven W. Boese" wrote: > Bobby, > =20 > Not wanting to make any changes to the controller, the resistors were adde= d to the wiring harness at the CAS end. So the path to ground was unchanged= . Thanks for the suggestion. > =20 > Steve > =20 > From: Rotary motors in aircraft [flyrotary@lancaironline.net] on behalf of= Bobby J. Hughes [bhughes@qnsi.net] > Sent: Tuesday, November 06, 2012 6:11 PM > To: Rotary motors in aircraft > Subject: [FlyRotary] Re: Renesis CAS & EC-2 upgrade? >=20 > Floating ground?=20 >=20 > Sent from my iPad >=20 > On Nov 6, 2012, at 6:52 PM, "Steven W. Boese" wrote: >=20 >> A follow-up on the attempt to use Renesis CAS with an EC2 controller set u= p for '86 stock Mazda CAS.=20 >> =20 >> There appeared to be a correlation between loosing the rotor 2 controller= signals with crossing the staging threshold on startup. This was tested by= starting the engine with the throttle open sufficiently that the manifold p= ressure should not drop to less than the staging threshold. The result was t= hat the engine still ran only on rotor 1 until RPM reached at least 1400 RPM= . It just didn't take as long to reach this RPM as before. This behavior a= nd examination of controller signals recorded during the startup disproved t= he appearance of a correlation between loosing rotor 2 controller signals an= d staging. >> =20 >> 1K ohm resistors were then added between each Renesis CAS signal and grou= nd. With these resistors installed, the engine started easily and ran norma= lly at all throttle settings. Since the engine was operated with this setup= for only a few minutes, it is unknown if this is a reliable solution. If i= t isn't, it is certainly a step in the right direction. Plots of the CAS si= gnals with and without the 1K ohm resistors are attached. The voltage scale= s on the two plots are the same, but voltages read from the plots must be mu= ltiplied by a factor of 3 to give absolute values in volts. Higher resoluti= on plots of the CAS signals are available on request. Any feedback on why a= dding the resistors is effective would be welcome. >> =20 >> Steve Boese >> RV6A, 1986 13B NA, RD1A, EC2 --Apple-Mail-8EAA502E-B3B5-4B08-8888-729F91CFC8B9 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: 7bit

Steve

Without the resistor, the eleven unwanted pulses that go below zero are also inverted. With the resistor they stay positive and are almost eliminated. You could see if CAS #2 is causing interference by removing the resistor from CAS #1.

Bobby

Sent from my iPad

On Nov 6, 2012, at 7:53 PM, "Steven W. Boese" <SBoese@uwyo.edu> wrote:

Bobby,

Not wanting to make any changes to the controller, the resistors were added to the wiring harness at the CAS end. So the path to ground was unchanged. Thanks for the suggestion.

Steve

From: Rotary motors in aircraft [flyrotary@lancaironline.net] on behalf of Bobby J. Hughes [bhughes@qnsi.net]
Sent: Tuesday, November 06, 2012 6:11 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Renesis CAS & EC-2 upgrade?

Floating ground?

Sent from my iPad

On Nov 6, 2012, at 6:52 PM, "Steven W. Boese" <SBoese@uwyo.edu> wrote:

A follow-up on the attempt to use Renesis CAS with an EC2 controller set up for '86 stock Mazda CAS .

There appeared to be a correlation between loosing the rotor 2 controller signals with crossing the staging threshold on startup. This was tested by starting the engine with the throttle open sufficiently that the manifold pressure should not drop to less than the staging threshold. The result was that the engine still ran only on rotor 1 until RPM reached at least 1400 RPM. It just didn't take as long to reach this RPM as before. This behavior and examination of controller signals recorded during the startup disproved the appearance of a correlation between loosing rotor 2 controller signals and staging.

1K ohm resistors were then added between each Renesis CAS signal and ground. With these resistors installed, the engine started easily and ran normally at all throttle settings. Since the engine was operated with this setup for only a few minutes, it is unknown if this is a reliable solution. If it isn't, it is certainly a step in the right direction. Plots of the CAS signals with and without the 1K ohm resistors are attached. The voltage scales on the two plots are the same, but voltages read from the plots must be multiplied by a factor of 3 to give absolute values in volts. Higher resolution plots of the CAS signals are available on request. Any feedback on why adding the resistors is effective would be welcome.

Steve Boese

RV6A, 1986 13B NA, RD1A , EC2

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