Return-Path: Received: from imf25aec.mail.bellsouth.net ([205.152.59.73] verified) by logan.com (CommuniGate Pro SMTP 4.2.1) with ESMTP id 404749 for flyrotary@lancaironline.net; Thu, 09 Sep 2004 20:47:28 -0400 Received-SPF: pass receiver=logan.com; client-ip=205.152.59.73; envelope-from=sqpilot@bellsouth.net Received: from Carol ([209.214.44.73]) by imf25aec.mail.bellsouth.net (InterMail vM.5.01.06.11 201-253-122-130-111-20040605) with SMTP id <20040910004657.BNPZ2078.imf25aec.mail.bellsouth.net@Carol> for ; Thu, 9 Sep 2004 20:46:57 -0400 Message-ID: <003201c496cf$a83e2c20$492cd6d1@Carol> From: "paul" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] First engine run with Monster Prop Date: Thu, 9 Sep 2004 19:46:45 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_002D_01C496A5.BCDFA480" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1437 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2800.1441 This is a multi-part message in MIME format. ------=_NextPart_000_002D_01C496A5.BCDFA480 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable ----- Original Message -----=20 From: Ed Anderson=20 To: Rotary motors in aircraft=20 Sent: Thursday, September 09, 2004 2:07 PM Subject: [FlyRotary] First engine run with Monster Prop 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 Hi, Ed...in the military I was fortunate enough to have the = opportunity to fly a few aircraft that are, as the military feels a need = to do to their aircraft, overpowered. In New Mexico, I had a brief = flight in a P-51. A definate torque machine. The accepted method for = takeoff was to apply power gently, until enough airspeed is achieved = that the rudder has more authority. (Of course ailerons and other = controls will also slowly gain more authority). Once the tailwheel was = up and flying speed was attained, only then was more power added. I = also flew the U-6 (Beaver) in Viet Nam.....we were also limited on = takeoff power. Once flying speed was attained, more power could be = added. Probably will work for the RVs with "the club" as well. = Wouldn't hurt to try it. Congrats on getting your engine, prop/redrive = assembled. Thanks for keeping us informed with your progress and test = results. Paul Conner, 13b powered SQ2000 at the airport and ready for = taxi testing. ------=_NextPart_000_002D_01C496A5.BCDFA480 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
 
----- Original Message -----
From:=20 Ed=20 Anderson
Sent: Thursday, September 09, = 2004 2:07=20 PM
Subject: [FlyRotary] First = engine run=20 with Monster Prop

Ok, got out today and fired up the = engine with=20 the new prop and gear box.  This is the 76x88 inch prop that is = 2" longer=20 than the one Tracy and Rusty have on their birds.  The static was = 5400=20 rpm at 28.75" with ambient manifold pressure reading 29.75" (as best I = 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 = 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=20 what I would normally see.  Considering that the static rpm was = the same=20 as my old gearbox and prop, it likely I was producing the same HP and=20 therefore would not expect major difference.  The larger prop did = not=20 seem to interfere with the cooling airflow - at least on the=20 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=20 flying now (74x88) is a bit more prop than is optimum.  I will = fly with=20 it and record the data so that Performance Propellers will know how = much to=20 trim when I 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
 
Hi, Ed...in the military I was = fortunate enough=20 to have the opportunity to fly a few aircraft that are, as the = military feels=20 a need to do to their aircraft,  overpowered.  In New = Mexico, I had=20 a brief flight in a P-51.  A definate torque machine.  The = accepted=20 method for takeoff was to apply power gently, until enough airspeed is = achieved that the rudder has more authority. (Of course ailerons and = other=20 controls will also slowly gain more authority).  Once the = tailwheel was=20 up and flying speed was attained, only then was more power = added.  I also=20 flew the U-6 (Beaver) in Viet Nam.....we were also limited on takeoff = power.=20 Once flying speed was attained, more power could be added. =  Probably will=20 work for the RVs with "the club" as well.  Wouldn't hurt to try = it. =20 Congrats on getting your engine, prop/redrive assembled.  Thanks = for=20 keeping us informed with your progress and test results.  Paul = Conner,=20 13b powered SQ2000 at the airport and ready for taxi=20 testing.
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