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X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mail.globalsuite.net ([69.46.103.200] verified) by logan.com (CommuniGate Pro SMTP 5.2.0) with SMTP id 2784092 for flyrotary@lancaironline.net; Sun, 09 Mar 2008 11:05:24 -0400 Received-SPF: none receiver=logan.com; client-ip=69.46.103.200; envelope-from=rusty@radrotary.com X-AuditID: c0a8013c-a98fbbb000004b31-a1-47d3fc8abdbc Received: from DELLRD1 (unknown [209.114.234.11]) by mail.globalsuite.net (Symantec Mail Security) with ESMTP id 7FE2C4DC017 for ; Sun, 9 Mar 2008 09:04:42 -0600 (MDT) From: "Russell Duffy" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: Anyone have an RD-1C for sale? Date: Sat, 8 Mar 2008 23:04:08 -0600 Message-ID: <000001c881a3$0398b150$09b812c6@DELLRD1> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0001_01C88170.B8FE4150" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 Importance: Normal In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3198 X-Brightmail-Tracker: AAAAAA== This is a multi-part message in MIME format. ------=_NextPart_000_0001_01C88170.B8FE4150 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Good one mate, I knew you couldn't let it go. =20 =20 Hi George, =20 Well that certainly IS the problem. I was all set to bolt a Lycoming on = the RV-3, but I realize that what I need is a project, not a plane. Since there's no doubt a single will work for an RV-3, there's really no = reason not to do it. =20 =20 While it may seem wishy washy to go back to the RD-1C, the damper on = the Autoflight drive didn't magically fix the resonance problem, and the = RV-3 has changed the power requirements. For previous aircraft, I was only planning to have about 80 HP, and that would fall within the 6000 rpm = limit of the Autoflight drive. Now that I can use as much power as I can = make, I need more RPM. =20 =20 The offset thrust line of the Autoflight drive would have worked well = for the previous aircraft I was considering, but not so well for the RV = cowl. The mount plate on Tracy's drive is also really handy for mounting = coolers for the RV cowl inlets. =20 =20 The Autoflight drive is about 12 lbs lighter IIRC, but I have the = opposite problem with weight now. A single made from stock housings is way overweight compared to 912S, but compared to an O-200 or O-235, it's = just fine. Using stock housings will just limit you to aircraft that were designed for 100-125 HP LyConts. =20 =20 Finally, I really like the carbon fiber ground adjustable prop that Sensenich makes, and the RD-1C rotates the proper direction to use it. =20 =20 I should probably be more concerned with building the plane for now, but = I can't help but think of engine stuff. I've got a partial mount on order from the guys who make Van's mounts. I don't know if I'll try to make a beam style mount, or use a sandwich plate similar to the old CCI mount. Either way, I'll size it to fit either the single rotor, or a two rotor = as a fall back plan. =20 =20 Enough babbling for now. =20 =20 Rusty (watching the salt magically melt snow) =20 =20 =20 ------=_NextPart_000_0001_01C88170.B8FE4150 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message

Good one mate, I knew you couldn't let it go.

Hi=20 George,

Well that=20 certainly IS the problem. I was all set to bolt a = Lycoming=20 on the RV-3, but I realize that what I need is a project, not a=20 plane. Since there's no doubt a single will work for an RV-3, = there's=20 really no reason not to do it.

While it may=20 seem wishy washy to go back to the RD-1C, the damper on the = Autoflight=20 drive didn't magically fix the resonance problem, and the RV-3 has = changed=20 the power requirements. For previous aircraft, I was only planning = to have=20 about 80 HP, and that would fall within the 6000 rpm limit of=20 the Autoflight drive. Now that I can use as much power = as I can=20 make, I need more RPM.

The offset=20 thrust line of the Autoflight drive would have worked well for the = previous=20 aircraft I was considering, but not so well for the RV cowl. = The=20 mount plate on Tracy's drive is also really handy for mounting = coolers for=20 the RV cowl inlets.

The=20 Autoflight drive is about 12 lbs lighter IIRC, but I have the opposite = problem=20 with weight now. A single made from stock housings is = way=20 overweight compared to 912S, but compared to an O-200 or O-235, = it's just=20 fine. Using stock housings will just limit you to = aircraft=20 that were designed for 100-125 HP LyConts. =

Finally, I=20 really like the carbon fiber ground adjustable prop that Sensenich = makes, and=20 the RD-1C rotates the proper direction to use it. =

I should=20 probably be more concerned with building the plane for now, but I can't = help but=20 think of engine stuff. I've got a partial mount on order from the = guys who=20 make Van's mounts. I don't know if I'll try to make a beam style = mount, or=20 use a sandwich plate similar to the old CCI mount. Either way, = I'll size=20 it to fit either the single rotor, or a two rotor as a fall back=20 plan.

Enough=20 babbling for now.

Rusty=20 (watching the salt magically melt snow)

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