X-Virus-Scanned: clean according to Sophos on Logan.com X-PolluStop-Diagnostic: (direct reply)\eX-PolluStop-Score: 0.00\eX-PolluStop: Scanned with Niversoft PolluStop 2.1 RC1, http://www.niversoft.com/pollustop Return-Path: Received: from imf22aec.mail.bellsouth.net ([205.152.59.70] verified) by logan.com (CommuniGate Pro SMTP 4.3c4) with ESMTP id 861633 for flyrotary@lancaironline.net; Fri, 08 Apr 2005 11:16:37 -0400 Received-SPF: pass receiver=logan.com; client-ip=205.152.59.70; envelope-from=sladerj@bellsouth.net Received: from JSLADE ([65.8.209.42]) by imf22aec.mail.bellsouth.net (InterMail vM.5.01.06.11 201-253-122-130-111-20040605) with ESMTP id <20050408151551.FRIW2068.imf22aec.mail.bellsouth.net@JSLADE> for ; Fri, 8 Apr 2005 11:15:51 -0400 From: "John Slade" To: "Rotary motors in aircraft" Subject: RE: [FlyRotary] idle speed with RD1 redrives? Date: Fri, 8 Apr 2005 11:15:49 -0400 Message-ID: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_01BF_01C53C2C.516B47E0" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook IMO, Build 9.0.2416 (9.0.2910.0) Importance: Normal In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1409 This is a multi-part message in MIME format. ------=_NextPart_000_01BF_01C53C2C.516B47E0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit MessageRusty, I have the same rattle at about the same rpm. I spoke to Tracy about this recently. I think he said it should be at a lower rpm, but even at 1100 or so it's normal and not to worry about it so long as the run-out remains unchanged. I have my idle set below the "rattle rpm" so I'm not dwelling in that area much. If you talk with Tracy and confirm (or deny) this - let me know. IIRC, the RD1 drives have a low rpm point where they're known to rattle. I guess this is torque reversals, or something like that from the engine. Anyway, can someone confirm that this is true, and tell me what rpm this is supposed to happen at? I've never been able to idle below 1500 or so, but now, I could probably idle down to 1000 easily. The problem is that I seem to hit this rattle mode at 1100-1200 rpm, so I've got my idle set at 1400 for now. Thanks, Rusty (wondering if I should have inspected the redrive following the oil out) PS- TIG and Plasma machines both got 1.5 inches of water before I picked them up, but I dried them out yesterday, and they both work now (thank goodness). Fortunately nothing expensive was damaged in the flood, assuming we don't have to replace the carpet in the great room. ------=_NextPart_000_01BF_01C53C2C.516B47E0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message
Rusty,
I have the same rattle at about the same rpm. =
I spoke to Tracy about this recently. I think = he said=20 it should be at a lower rpm, but even at 1100 or so it's normal and not = to worry=20 about it so long as the run-out remains unchanged. I have my idle set = below the=20 "rattle rpm" so I'm not dwelling in that area much. If you talk with = Tracy and=20 confirm (or deny) this - let me know.
 
 IIRC, the RD1 drives have a low = rpm point=20 where they're known to rattle.  I guess this is torque = reversals, or=20 something like that from the engine.  Anyway, can someone confirm = that this=20 is true, and tell me what rpm this is supposed to happen at?  I've = never=20 been able to idle below 1500 or so, but now, I could probably idle down = to 1000=20 easily.  The problem is that I seem to hit this rattle mode at = 1100-1200=20 rpm, so I've got my idle set at 1400 for now. 
 
Thanks,
Rusty = (wondering if I=20 should have inspected the redrive following the oil = out)
 
 
PS- TIG and = Plasma=20 machines both got 1.5 inches of water before I picked them up, but I = dried=20 them out yesterday, and they both work now (thank = goodness). =20 Fortunately nothing expensive was damaged in the flood, assuming we = don't have=20 to replace the carpet in the great=20 room.
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