Return-Path: Received: from fed1rmmtao12.cox.net ([68.230.241.27] verified) by logan.com (CommuniGate Pro SMTP 4.2.1) with ESMTP id 404962 for flyrotary@lancaironline.net; Fri, 10 Sep 2004 01:04:42 -0400 Received-SPF: none receiver=logan.com; client-ip=68.230.241.27; envelope-from=daveleonard@cox.net Received: from davidandanne ([68.111.224.107]) by fed1rmmtao12.cox.net (InterMail vM.6.01.03.02.01 201-2131-111-104-103-20040709) with SMTP id <20040910050412.UNCY29286.fed1rmmtao12.cox.net@davidandanne> for ; Fri, 10 Sep 2004 01:04:12 -0400 From: "DaveLeonard" To: "Rotary motors in aircraft" Subject: RE: [FlyRotary] Re: First engine run with Monster Prop Date: Thu, 9 Sep 2004 22:04:13 -0700 Message-ID: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_004E_01C496B8.F114D640" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook IMO, Build 9.0.2416 (9.0.2910.0) Importance: Normal X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1441 In-Reply-To: This is a multi-part message in MIME format. ------=_NextPart_000_004E_01C496B8.F114D640 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Ed, if nothing else, this prop will be more efficient so with the same hp you will notice an improvement, especially in climb. Dave Leonard ----- Original Message ----- From: Ed Anderson To: Rotary motors in aircraft 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_004E_01C496B8.F114D640 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Ed, if = nothing else,=20 this prop will be more efficient so with the same hp you will notice an=20 improvement, especially in climb.
 
Dave=20 Leonard
----- Original Message -----
From:=20 Ed Anderson
To: Rotary motors in = aircraft=20
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"=20 longer than the one Tracy and Rusty have on their birds.  The = static=20 was 5400 rpm at 28.75" with ambient manifold pressure reading 29.75" = (as=20 best I interpolated). OAT was 87F.  Idle was considerably = smoother=20 whether due to increased mass of larger prop, new gear box or = both.  I=20 did notice the 2.85 has considerably less gear lash than the=20 2.17.
 
 I took it for a quick taxi up = and down=20 our 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=20 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=20 same 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=20 weekend 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=20 feels a need to do to their aircraft,  overpowered.  In = New=20 Mexico, I had a brief flight in a P-51.  A definate torque=20 machine.  The accepted method for takeoff was to apply power = gently,=20 until enough airspeed is achieved that the rudder has more = authority. (Of=20 course ailerons and other controls will also slowly gain more=20 authority).  Once the tailwheel was up and flying speed was = attained,=20 only then was more power added.  I also flew the U-6 (Beaver) = in Viet=20 Nam.....we were also limited on takeoff power. Once flying speed was = attained, more power could be added.  Probably will work for = the RVs=20 with "the club" as well.  Wouldn't hurt to try it.  = Congrats on=20 getting your engine, prop/redrive assembled.  Thanks for = keeping us=20 informed with your progress and test results.  Paul Conner, 13b = powered=20 SQ2000 at the airport and ready for taxi=20 testing.
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