X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from qmta04.emeryville.ca.mail.comcast.net ([76.96.30.40] verified) by logan.com (CommuniGate Pro SMTP 5.3.5) with ESMTP id 4195454 for flyrotary@lancaironline.net; Sun, 04 Apr 2010 23:14:37 -0400 Received-SPF: pass receiver=logan.com; client-ip=76.96.30.40; envelope-from=n3773@comcast.net Received: from omta21.emeryville.ca.mail.comcast.net ([76.96.30.88]) by qmta04.emeryville.ca.mail.comcast.net with comcast id 1f4e1e0031u4NiLA4fE2DR; Mon, 05 Apr 2010 03:14:02 +0000 Received: from rv8 ([71.237.248.186]) by omta21.emeryville.ca.mail.comcast.net with comcast id 1fE11e00D422aQ78hfE1Pr; Mon, 05 Apr 2010 03:14:02 +0000 Message-ID: <991CF8F07BF34ED68E3E3170009D3104@rv8> Reply-To: "kevin lane" From: "kevin lane" To: "flyrotary" Subject: youtube strobe Date: Sun, 4 Apr 2010 20:13:18 -0700 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_000E_01CAD433.446E9980" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.5843 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.5579 This is a multi-part message in MIME format. ------=_NextPart_000_000E_01CAD433.446E9980 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable I questioned my tach accuracy in my video. it was shot at 30 fps, or = 1800 f/min. I saw the engine start and indicate about 300rpm, and 6 = prop blade blurs show. I sped it up until it started to die at 1500 rpm = indicated.[prop blur shows reverse rotation]. at what I'd guess was = indicating 1000rpm the prop shows as a steady, 2-bladed non-rotating = blur. assuming that the camera is catching the same prop blade twice, = 180=B0 apart, that would be at half the 1800 rpm on the camera, right? = so, 900rpm isn't far from my guess of 1000rpm [from memory based on how = the engine sounded in the video]. same for 300rpm/6 blade blur - = 1800/6 =3D 300 rpm. still seems like a lot of wind for 300rpm, = considering my Lycoming idles at twice that speed, but then, I'm = typically inside the cockpit, and the test prop 68x66(?) [from a 150hp = rv-4]. I intend to run it without the prop in a week so I can check my timing = without endangering my life. the msd ignition box has 3000/6000/9000rpm = limiter pills which can assist in keeping limits, altho the trailing = ignitions have none. I can attempt to run the ignitions separately, no = idea if it will run that way at this point. another option would be to = tow it over to pineapple racing and hear what rob golden has to say. = they are just on the other side of the airport. KevinLane Carpentry www.KevinLaneCarpentry.com ------=_NextPart_000_000E_01CAD433.446E9980 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

I questioned my tach accuracy in my = video. =20 it was shot at 30 fps, or 1800 f/min. I saw the engine start and = indicate=20 about 300rpm, and 6 prop blade blurs show. I sped it up until it = started=20 to die at 1500 rpm indicated.[prop blur shows reverse rotation]. = at what=20 I'd guess was indicating 1000rpm the prop shows as a steady, 2-bladed=20 non-rotating blur. assuming that the camera is catching the = same prop=20 blade twice, 180=B0 apart, that would be at half the 1800 rpm on the = camera,=20 right? so, 900rpm isn't far from my guess of 1000rpm [from memory = based=20 on how the engine sounded in the video]. same for = 300rpm/6=20 blade blur - 1800/6 =3D 300 rpm. still seems like a lot of = wind for=20 300rpm, considering my Lycoming idles at twice that speed, but then, I'm = typically inside the cockpit, and the test prop 68x66(?) [from a = 150hp=20 rv-4].

I intend to run it without the prop in = a week so=20 I can check my timing without endangering my life. the msd = ignition box=20 has 3000/6000/9000rpm limiter pills which can assist in keeping = limits,=20 altho the trailing ignitions have none. I can attempt to run the = ignitions=20 separately, no idea if it will run that way at this point. another = option=20 would be to tow it over to pineapple racing and hear what rob golden has = to=20 say. they are just on the other side of the=20 airport.

KevinLane Carpentry
www.KevinLaneCarpentry.com=

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