X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [129.116.87.143] (HELO MAIL01.austin.utexas.edu) by logan.com (CommuniGate Pro SMTP 5.0.7f) with ESMTP id 952223 for flyrotary@lancaironline.net; Tue, 24 Jan 2006 14:38:02 -0500 Received-SPF: none receiver=logan.com; client-ip=129.116.87.143; envelope-from=mark.steitle@austin.utexas.edu X-MimeOLE: Produced By Microsoft Exchange V6.5.7226.0 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----_=_NextPart_001_01C6211D.961A6121" Subject: FW: [FlyRotary] Re: Two Alternators? Date: Tue, 24 Jan 2006 13:37:17 -0600 Message-ID: <87DBA06C9A5CB84B80439BA09D86E69E0378DB61@MAIL01.austin.utexas.edu> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [FlyRotary] Re: Two Alternators? Thread-Index: AcYhGClbgvPqS7voSbyD2wLWjWF4bgAAI2kwAAEnqlA= From: "Mark R Steitle" To: "Rotary motors in aircraft" This is a multi-part message in MIME format. ------_=_NextPart_001_01C6211D.961A6121 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable =20 =20 ________________________________ From: Mark R Steitle=20 Sent: Tuesday, January 24, 2006 1:22 PM To: 'Rotary motors in aircraft' Subject: RE: [FlyRotary] Re: Two Alternators? =20 Bill, I haven't done a wirebook on my a/c as yet, but it is based on the Z-14 architecture. (I tried to attach the Z-14 pdf, but it was too large and so it bounced. I will send it to you directly.) Like I said earlier, the only real difference is that I'm using Tracy's EC-2/EM-2 rather than mags. These are wired per Tracy's instructions, and directly to a CB on the "Flight Critical Bus". If you haven't done so, I recommend you read the article I referenced earlier on charging system design by Bob Nuckols of the Aero-Electric Connection. He discusses the pro's and con's of the different architectures. He describes the dual alt, dual battery system as the mother of all electrical systems. =20 =20 As for the choice of alternators, that's up to you and your needs. For backup, many builders are using the small, 20 amp permanent magnet unit similar to those used on John Deere garden tractors. B&C sells them with the appropriate regulator. I chose to go with two of the 55A ND units. They are used on many small cars and are very compact and can be converted to external regulation fairly easy, should you choose to do it. They come with different type of mounting tabs, so pay close attention to that aspect. =20 Another change I made to improve longevity was to oversize the alternator pulleys, as well as undersize the eccentric pulley. This reduced the maximum alternator rpm to about 10,000. This is about half of what it was initially. By reducing the eccentric pulley, it slows down the alternators as well as the water pump. I would have to check my records to find the supplier for the oversized pulleys. It may have been Canton Racing, but I'm not certain. =20 Mark S. =20 ________________________________ From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of wrjjrs@aol.com Sent: Tuesday, January 24, 2006 12:57 PM To: Rotary motors in aircraft Subject: [FlyRotary] Re: Two Alternators? =20 Mark, I would be very interested as I'm running a 20B in my RV-10. Can you send me details? Thanks, Bill Jepson WRJJRS@aol.com=20 =20 -----Original Message----- From: Mark R Steitle To: Rotary motors in aircraft Sent: Tue, 24 Jan 2006 07:20:36 -0600 Subject: [FlyRotary] Re: Two Alternators? Doug, I have dual alternators and dual batteries per Aero-Electric Z-14 architecture. I?m using the small 55amp ND units. They weigh about half of what the Mazda alternator weighs, so I rationalized that there was very little weight penalty to using two alternators, but a significant safety improvement. With an electrically dependent engine and all electric panel, I decided this was the way to go for me. The cross-feed contactor connects both Odyssey batteries during starting, so I am able to use smaller batteries than would be required to start the 3-rotor with only one battery. Every annual, I plan on replacing the main battery, rotating the 1 year old main battery to the aux position, and move the 2 year old aux battery to my Goldwing motorcycle. That way the main battery will be less than one year old, the aux battery will be 1 - 2 years old, and the motorcycle battery will be 2-3 years old. I?ll send you a picture off-line. =20 =20 Mark S.=20 =20 ________________________________ From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of DLOMHEIM@aol.com Sent: Tuesday, January 24, 2006 6:11 AM To: Rotary motors in aircraft Subject: [FlyRotary] Two Alternators? =20 I am debating the future use of two batteries vs. two alternators and I was wondering if anyone in the group has mounted a second alternator and if so if they had any pictures of its mounting location, etc. =20 Thanks for the information. =20 Doug Lomheim RV-9A / 13B OK City, OK ------_=_NextPart_001_01C6211D.961A6121 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

 

 

From: = Mark R Steitle
Sent: Tuesday, January = 24, 2006 1:22 PM
To: 'Rotary motors in aircraft'
Subject: RE: [FlyRotary] = Re: Two Alternators?

 

Bill,

I haven’t done a wirebook on = my a/c as yet, but it is based on the Z-14 architecture. (I tried to = attach the Z-14 pdf, but it was too large and so it bounced.  I will send it = to you directly.)  Like I said earlier, the only real difference is that I’m using Tracy’s EC-2/EM-2 rather than mags.  These are wired per Tracy’s instructions, and = directly to a CB on the “Flight Critical Bus”.  If you haven’t = done so, I recommend you read the article I referenced earlier on charging = system design by Bob Nuckols of the Aero-Electric Connection.  He = discusses the pro’s and con’s of the different architectures.  He = describes the dual alt, dual battery system as the mother of all electrical systems. 

 

As for the choice of alternators, that’s up to you and your needs.  For backup, many builders = are using the small, 20 amp permanent magnet unit similar to those used on = John Deere garden tractors.  B&C sells them with the appropriate regulator.  I chose to go with two of the 55A ND units.  They = are used on many small cars and are very compact and can be converted to = external regulation fairly easy, should you choose to do it.  They come with different type of mounting tabs, so pay close attention to that = aspect.

 

Another change I made to improve = longevity was to oversize the alternator pulleys, as well as undersize the = eccentric pulley.  This reduced the maximum alternator rpm to about = 10,000.  This is about half of what it was initially.  By reducing the = eccentric pulley, it slows down the alternators as well as the water pump.  I = would have to check my records to find the supplier for the oversized = pulleys.  It may have been Canton Racing, but I’m not = certain.

 

Mark S.  =

From: = Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of wrjjrs@aol.com
Sent: Tuesday, January = 24, 2006 12:57 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: = Two Alternators?

 

Mark,

I would be very interested as I'm running a 20B in = my RV-10. Can you send me details?

Thanks, Bill Jepson WRJJRS@aol.com =

 
-----Original Message-----
From: Mark R Steitle <mark.steitle@austin.utexas.edu>
To: Rotary motors in = aircraft <flyrotary@lancaironline.net>
Sent: Tue, 24 Jan 2006 07:20:36 -0600
Subject: [FlyRotary] Re: Two Alternators?

Doug,

I have dual alternators and dual = batteries per Aero-Electric = Z-14 architecture.  I?m using the small 55amp ND units.  They weigh = about half of what the Mazda alternator weighs, so I rationalized that there = was very little weight penalty to using two alternators, but a significant safety improvement.  With an electrically dependent engine and all = electric panel, I decided this was the way to go for me.  The cross-feed = contactor connects both Odyssey batteries during starting, so I am able to use = smaller batteries than would be required to start the 3-rotor with only one battery. =  Every annual, I plan on replacing the main battery, rotating the 1 year old = main battery to the aux position, and move the 2 year old aux battery to my = Goldwing motorcycle. =  That way the main battery will be less than one year old, the aux battery will be = 1 - 2 years old, and the motorcycle battery will be 2-3 years old.  I?ll = send you a picture off-line. 

 

Mark S. =

 

From: = Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of DLOMHEIM@aol.com
Sent: Tuesday, January = 24, 2006 6:11 AM
To: Rotary motors in = aircraft
Subject: [FlyRotary] Two Alternators?

 

I am debating the future use of = two batteries vs. two = alternators and I was wondering if anyone in the group has mounted a second alternator = and if so if they had any pictures of its mounting location, = etc.

 

=

Thanks for the = information.

 

=

Doug Lomheim    = RV-9A / 13B

OK City, = OK

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