X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from pan.gwi.net ([207.5.128.165] verified) by logan.com (CommuniGate Pro SMTP 5.2.2) with ESMTPS id 2874748 for flyrotary@lancaironline.net; Sun, 27 Apr 2008 21:07:00 -0400 Received-SPF: pass receiver=logan.com; client-ip=207.5.128.165; envelope-from=silvius@gwi.net Received: from yourlk4rlmsu41 (bb-216-195-174-159.gwi.net [216.195.174.159]) by pan.gwi.net (8.13.1/8.13.1) with SMTP id m3S16HsY040952 for ; Sun, 27 Apr 2008 21:06:20 -0400 (EDT) (envelope-from silvius@gwi.net) Message-ID: <001a01c8a8d4$6eda6a00$9faec3d8@yourlk4rlmsu41> From: "Michael Silvius" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: the Kubota dynamo Date: Sun, 27 Apr 2008 21:06:09 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0017_01C8A8AA.8454DD40" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1807 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1807 This is a multi-part message in MIME format. ------=_NextPart_000_0017_01C8A8AA.8454DD40 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Scott: Here are some details I saved in my files regarding the Kubota units, it = wa authored by John Martindale of NSW Australia a few years ago. He = flies a Rand Robinson KR2 with a 2700 cc Corvair The Kubota, John Deere and Yanmar permanent magnet units are all = similiar, perhaps identical, and supplied by a Japanese crowd called = Kokusan-Denki. Here are the specks for the Kubota unit. They state the following:=20 Voltage 12=20 Normal Output 150watt=20 Max current 14amp=20 Rotation Clockwise=20 Output rpm 4250rpm=20 Charge starting 1800rpm=20 Drive pulley 100mm=20 Alt pulley 58.5mm=20 Ratio 1:1.7=20 Salient points are that at the alternator pulley we seem to need 1800rpm = to turn off the charge light (ie 12 volt or more) and that anything over = 4250rpm seems unnecessary. I can vouch with smoke that 8225rpm is = definitately not OK!! Have to keep in mind that the regulators for these = units do not work by varying field strength in the alternator. The = latter just keeps on going full bore and the regulator works by dumping = any excess load to heat via the heat sink or when it reaches a limit = there the alternator coils themselves get hotter prior to meltdown.=20 ------=_NextPart_000_0017_01C8A8AA.8454DD40 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Scott:
 
Here are some details I saved in my = files regarding=20 the Kubota units, it wa authored by John Martindale of NSW Australia a = few years=20 ago. He flies a Rand Robinson KR2 with a 2700 cc Corvair

The Kubota, John Deere and Yanmar permanent magnet units are all=20 similiar, perhaps identical, and supplied by a Japanese crowd called=20 Kokusan-Denki. Here are the specks for the Kubota unit.

They state the following:

Voltage 12

Normal Output 150watt

Max current 14amp

Rotation Clockwise

Output rpm 4250rpm

Charge starting 1800rpm

Drive pulley 100mm

Alt pulley 58.5mm

Ratio 1:1.7

Salient points are that at the alternator pulley we seem to need = 1800rpm=20 to turn off the charge light (ie 12 volt or more) and that anything over = 4250rpm=20 seems unnecessary. I can vouch with smoke that 8225rpm is definitately = not OK!!=20 Have to keep in mind that the regulators for these units do not work by = varying=20 field strength in the alternator. The latter just keeps on going full = bore and=20 the regulator works by dumping any excess load to heat via the heat sink = or when=20 it reaches a limit there the alternator coils themselves get hotter = prior to=20 meltdown.

 
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