X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mail10.syd.optusnet.com.au ([211.29.132.191] verified) by logan.com (CommuniGate Pro SMTP 5.2.0) with ESMTPS id 2784504 for flyrotary@lancaironline.net; Sun, 09 Mar 2008 18:37:33 -0400 Received-SPF: pass receiver=logan.com; client-ip=211.29.132.191; envelope-from=lendich@optusnet.com.au Received: from george (d220-236-79-144.dsl.nsw.optusnet.com.au [220.236.79.144]) by mail10.syd.optusnet.com.au (8.13.1/8.13.1) with SMTP id m29MadFW029569 for ; Mon, 10 Mar 2008 09:36:41 +1100 Message-ID: <002901c88236$0c9b2c40$904fecdc@george> From: "George Lendich" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Anyone have an RD-1C for sale? Date: Mon, 10 Mar 2008 08:36:41 +1000 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0026_01C88289.DD2B9310" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.2180 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 X-Antivirus: avast! (VPS 0657-0, 12/12/2006), Outbound message X-Antivirus-Status: Clean This is a multi-part message in MIME format. ------=_NextPart_000_0026_01C88289.DD2B9310 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Message Good one mate, I knew you couldn't let it go. =20 Hi George, 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 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 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 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 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 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 Enough babbling for now. =20 Rusty (watching the salt magically melt snow) Rusty, I'm all for agreeing to disagree, as well you know, but I'm still = looking at making the damper harder, rather than softer as in the 2 = rotor. A man of your means may wish to opt for the aluminium end housings, I = believe Larry who owns an engineering company is looking at aluminium = housing for the long term - make sure their det gun surface treated. He = has done a very good job of rehashing PL's Bellhousing design and is = cutting his second pattern on CNC - great workmanship, great ideas and = great fellow to boot.. =20 I don't know what HP you really need but if more than 100hp look at = the Rx8 high compression rotor - I recently had mine cut to accommodate = 3mm apex seals, which gives me piece of mind as they run over my 42mm = P-Port. George ( down under) ------=_NextPart_000_0026_01C88289.DD2B9310 Content-Type: text/html; charset="iso-8859-1" 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,=20 there's really no reason not to do it. 
 
While it=20 may seem wishy washy to go back to the RD-1C,  the damper on the=20 Autoflight drive didn't magically fix the resonance problem, and = the RV-3=20 has changed the power requirements.  For previous aircraft, I was = only=20 planning to have 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=20 can 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=20 coolers for 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=20 but think of engine stuff.  I've got a partial mount on order = from the=20 guys who make Van's mounts.  I don't know if I'll try to make a = beam=20 style mount, or use a sandwich plate similar to the old CCI = mount. =20 Either way, I'll size it to fit either the single rotor, or a two = rotor as a=20 fall back plan.  
 
Enough=20 babbling for now. 
 
Rusty=20 (watching the salt magically melt snow)
 
Rusty,
I'm all for = agreeing to=20 disagree, as well you know, but I'm still looking at making the damper = harder,=20 rather than softer as in the 2 rotor.
 
A man of your = means may=20 wish to opt for the aluminium end housings, I believe Larry who owns = an=20 engineering company is looking at aluminium housing for the long term = - make=20 sure their det gun surface treated. He has done a very good job of = rehashing=20 PL's Bellhousing design and is cutting his second pattern on CNC - = great=20 workmanship, great ideas and great fellow to = boot..
 
I don't know = what HP you=20 really need but if more than 100hp look at the Rx8 high compression = rotor - I=20 recently had mine cut to accommodate 3mm apex seals, which gives me = piece of=20 mind as they run over my 42mm P-Port.
George ( down = under)
 

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