X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from aspensprings.uwyo.edu ([129.72.10.32] verified) by logan.com (CommuniGate Pro SMTP 6.0c1) with ESMTPS id 5747719 for flyrotary@lancaironline.net; Thu, 06 Sep 2012 12:11:52 -0400 Received-SPF: none receiver=logan.com; client-ip=129.72.10.32; envelope-from=SBoese@uwyo.edu Received: from ponyexpress-ht3.uwyo.edu (extlb.uwyo.edu [172.26.4.4]) by aspensprings.uwyo.edu (8.14.4/8.14.4) with ESMTP id q86GB9ig008795 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=FAIL) for ; Thu, 6 Sep 2012 10:11:14 -0600 (MDT) (envelope-from SBoese@uwyo.edu) Received: from ponyexpress-m10.uwyo.edu ([fe80::60dd:cb9e:6f71:3d48]) by ponyexpress-ht3.uwyo.edu ([fe80::4cde:db24:a0a9:ba5%15]) with mapi id 14.01.0339.001; Thu, 6 Sep 2012 10:11:13 -0600 From: "Steven W. Boese" To: Rotary motors in aircraft Subject: RE: [FlyRotary] Re: Intermittent hiccup Thread-Topic: [FlyRotary] Re: Intermittent hiccup Thread-Index: AQHNjEQ1BnH7JC3Zn02Gr1NeeAPOspd9dMQx Date: Thu, 6 Sep 2012 16:11:13 +0000 Message-ID: <3E8191F276108F4481AB0721BBA9269E05C83504@ponyexpress-m10.uwyo.edu> References: In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [75.228.132.210] Content-Type: multipart/alternative; boundary="_000_3E8191F276108F4481AB0721BBA9269E05C83504ponyexpressm10u_" MIME-Version: 1.0 --_000_3E8191F276108F4481AB0721BBA9269E05C83504ponyexpressm10u_ Content-Type: text/plain; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable Bill, As far as I know, Tracy's controllers don't encorporate a timing change bas= ed on an accessable table. Since this is what you are using, it seems unli= kely that a programmed timing change would be happening. There have been i= nstances of problems of this sort associated with CAS signals due to CAS mo= unting or signal amplitude issues. Since the MAP fluctuation is at WOT, it seems unlikely that a leak would be= the the source since the effect of a leak would decrease as the MAP approa= ches ambient. Possibly, there may be some pressure recovery or ram effect = in your intake system and the MAP variation might be due to airspeed variat= ions in a less than perfectly stable atmosphere. It is possible that at WOT the controller is intermittently usinging a high= MAP table location just above what is normally attained when programming t= he correction table. Unless the MAP is artificially increased into this ra= nge, programming those table locations cannot be accomplished by the normal= methods. This wouldn't be a problem if the corrected high MAP region of t= he table is similar to the default values. Steve Boese RV6A, 1986 13B NA, RD1A, EC2 ________________________________ From: Rotary motors in aircraft [flyrotary@lancaironline.net] on behalf of = Bill Bradburry [bbradburry@bellsouth.net] Sent: Thursday, September 06, 2012 9:26 AM To: Rotary motors in aircraft Subject: [FlyRotary] Re: Intermittent hiccup Thanks, Steve, Tracy would have to enlighten me about a timing change. I haven=92t touche= d the timing from the factory settings. I will take a look at the MAP thou= gh. What do you think could be causing the fluctuations? A leak? This is= at WOT. I only close the throttle if I am in the pattern to land. I cont= rol the engine speed with the MT electric prop otherwise. Bill B --_000_3E8191F276108F4481AB0721BBA9269E05C83504ponyexpressm10u_ Content-Type: text/html; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable

Bill,

As far as I know, Tracy's controllers don't encorporate= a timing change based on an accessable table. Since this is what you= are using, it seems unlikely that a programmed timing change would be happ= ening. There have been instances of problems of this sort associated with CAS signals due to CAS mounting or signal amp= litude issues.

Since the MAP fluctuation is at WOT, it seems unlikely = that a leak would be the the source since the effect of a leak would decrea= se as the MAP approaches ambient. Possibly, there may be some pressur= e recovery or ram effect in your intake system and the MAP variation might be due to airspeed variations in&n= bsp;a less than perfectly stable atmosphere.

It is possible that at WOT the controller is intermitte= ntly usinging a high MAP table location just above what is normally attaine= d when programming the correction table. Unless the MAP is artif= icially increased into this range, programming those table locations cannot be accomplished by the normal methods.&n= bsp; This wouldn't be a problem if the corrected high MAP region of th= e table is similar to the default values.

Steve Boese

RV6A, 1986 13B NA, RD1A, EC2

From: Rotary motors in aircraft [flyrotary= @lancaironline.net] on behalf of Bill Bradburry [bbradburry@bellsouth.net]<= br> Sent: Thursday, September 06, 2012 9:26 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Intermittent hiccup

Thanks, Steve,<= /span>

&= nbsp;

Tracy would have to enlighten me about a timing change. I haven=92t touched the timin= g from the factory settings. I will take a look at the MAP though.&nb= sp; What do you think could be causing the fluctuations? A leak? = ; This is at WOT. I only close the throttle if I am in the pattern to land. I control the engine speed with the MT electric pro= p otherwise.

&= nbsp;

Bill B

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