Return-Path: Received: from [24.25.9.103] (HELO ms-smtp-04-eri0.southeast.rr.com) by logan.com (CommuniGate Pro SMTP 4.2.1) with ESMTP id 404292 for flyrotary@lancaironline.net; Thu, 09 Sep 2004 15:08:10 -0400 Received-SPF: none receiver=logan.com; client-ip=24.25.9.103; envelope-from=eanderson@carolina.rr.com Received: from EDWARD (cpe-069-132-183-211.carolina.rr.com [69.132.183.211]) by ms-smtp-04-eri0.southeast.rr.com (8.12.10/8.12.7) with SMTP id i89J7cSH007879 for ; Thu, 9 Sep 2004 15:07:39 -0400 (EDT) Message-ID: <002801c496a0$472d4760$2402a8c0@EDWARD> From: "Ed Anderson" To: "Rotary motors in aircraft" Subject: First engine run with Monster Prop Date: Thu, 9 Sep 2004 15:07:40 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0025_01C4967E.BFD1A610" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1409 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2800.1409 X-Virus-Scanned: Symantec AntiVirus Scan Engine This is a multi-part message in MIME format. ------=_NextPart_000_0025_01C4967E.BFD1A610 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Ok, got out today and fired up the engine with the new prop and gear = box. This is the 76x88 inch prop that is 2" longer than the one Tracy = and Rusty have on their birds. The static was 5400 rpm at 28.75" with = ambient manifold pressure reading 29.75" (as best I interpolated). OAT = was 87F. Idle was considerably smoother whether due to increased mass = of larger prop, new gear box or both. I did notice the 2.85 has = considerably less gear lash than the 2.17. I took it for a quick taxi up and down our 35' wide runway and notice = that the "P" effect was considerable at full power. It felt like = someone was taking the nose of the aircraft and forcefully shoving it to = the left. Rudder with Nose wheel helping kept things under control = without any problem, but I think my first full power takeoffs will be = where they have those 100 -150' wide runways - just to be safe.{:>). = Subjectively seemed to have considerable more acceleration but will not = do any definitive test on this runway. Temperatures were normal. After extended runup the oil temps approached = 190F and coolant temp got up to 210F this is what I would normally see. = Considering that the static rpm was the same as my old gearbox and prop, = it likely I was producing the same HP and therefore would not expect = major difference. The larger prop did not seem to interfere with the = cooling airflow - at least on the ground. The RPM is a bit less than I had hoped for - but may just indicate that = the 2" increased diameter over the ones flying now (74x88) is a bit more = prop than is optimum. I will fly with it and record the data so that = Performance Propellers will know how much to trim when I ship it back. Hope to get the spinner painted over the weekend and go flying early = next week. Ed Ed Anderson RV-6A N494BW Rotary Powered Matthews, NC ------=_NextPart_000_0025_01C4967E.BFD1A610 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Ok, got out today and fired up the = engine with the=20 new prop and gear box.  This is the 76x88 inch prop that is 2" = longer than=20 the one Tracy and Rusty have on their birds.  The static was 5400 = rpm at=20 28.75" with ambient manifold pressure reading 29.75" (as best I=20 interpolated). OAT was 87F.  Idle was considerably smoother = whether=20 due to increased mass of larger prop, new gear box or both.  I did = notice=20 the 2.85 has considerably less gear lash than the 2.17.
 
 I took it for a quick taxi up and = down our=20 35' wide runway and notice that the "P" effect was considerable at full=20 power.  It felt like someone was taking the nose of the aircraft = and=20 forcefully shoving it to the left.  Rudder with Nose wheel helping = kept=20 things under control without any problem, but I think my first full = power=20 takeoffs will be where they have those 100 -150' wide runways - just to = be=20 safe.{:>).  Subjectively seemed to have considerable more=20 acceleration but will not do any definitive test on this = runway.
 
Temperatures were normal.  After = extended=20 runup the oil temps approached 190F and coolant temp got up to 210F this = is what=20 I would normally see.  Considering that the static rpm was the same = as my=20 old gearbox and prop, it likely I was producing the same HP and = therefore would=20 not expect major difference.  The larger prop did not seem to = interfere=20 with the cooling airflow - at least on the ground.
 
The RPM is a bit less than I had hoped = for=20 - but may just indicate that the 2" increased diameter over the = ones flying=20 now (74x88) is a bit more prop than is optimum.  I will fly with it = and=20 record the data so that Performance Propellers will know how much to = trim when I=20 ship it back.
 
Hope to get the spinner painted over = the weekend=20 and go flying early next week.
 
Ed
 
 
Ed Anderson
RV-6A N494BW Rotary=20 Powered
Matthews, NC
------=_NextPart_000_0025_01C4967E.BFD1A610--