X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from web1112.biz.mail.sk1.yahoo.com ([74.6.114.44] verified) by logan.com (CommuniGate Pro SMTP 5.2.16) with SMTP id 3889484 for flyrotary@lancaironline.net; Sat, 17 Oct 2009 18:38:14 -0400 Received-SPF: none receiver=logan.com; client-ip=74.6.114.44; envelope-from=admin@haaspowerair.com Received: (qmail 99622 invoked by uid 60001); 17 Oct 2009 22:37:39 -0000 Message-ID: <962406.99043.qm@web1112.biz.mail.sk1.yahoo.com> X-YMail-OSG: bn8IY1oVM1lBFtgQc0q0OWtViTaw92J_91IXulYiuOZJKHBMyj0CudEwj8zkKHvIesilmgGjUshFkgYGR0zodDiXuWewPrPklDeE07QZOtOGVk1K2DzuFEm9ChbwL7Srdu8ew0c23F2djdpR5yO.W7n92Tb5q2E6sijaZ2TeihWPfuDav6QcbltU7a3nhG.ApI6JtplEn6Mr_Z7LvEQUqtkdPqPXZHZsedJ5mi0wuAjRTU2wsW.GMzx1Fsn2RX8EKuEaaeEMMLi9ghIQJ36HkQLUgKRqxX9zEPVnDVT.KY11dDDtA_t5uirQqbCHlaYlyrdlLQtSz708nPLAeo6wY_vBc7bGpwsr_o3bIS0.OVM9PtfSa81PGYbYCrYp4yGZ Received: from [75.163.13.178] by web1112.biz.mail.sk1.yahoo.com via HTTP; Sat, 17 Oct 2009 15:37:38 PDT X-Mailer: YahooMailClassic/7.0.14 YahooMailWebService/0.7.347.3 Date: Sat, 17 Oct 2009 15:37:38 -0700 (PDT) From: stephen haas Subject: Re: [FlyRotary] Static rpm To: Rotary motors in aircraft In-Reply-To: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="0-1760037737-1255819058=:99043" --0-1760037737-1255819058=:99043 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Hi Guys... Just to add some data to the conversation. I run a Ivo prop and switch between two different blade designs.=C2=A0 Both= are 76" dia and both are set up for inflight adjustability.=20 =C2=A0 facts. my ignition has 4400 rpm chips in them. redrive ratio is 1.43-1. I usually = run 4400 engine rpm on take off and climb. this gives a prop rpm of 3076 an= d at 50f temp that works out to tip speed of 695.5 and .922 mach. Prop pull= s real strong at this rpm, anything over that and it starts to lay down. It= appears my Ivo is pretty effecient till about .94 or so. I have not had th= e balls to pull the chips out and=C2=A0take it=C2=A0to 1.0 mach but... =C2=A0 On this pass. http://www.youtube.com/watch?v=3DAOF6eT6FRmY =C2=A0 the motor was just under the chip rpm or about 4350 or so. temp was 26f,=C2= =A0 prop rpm=C2=A0 around=C2=A0 3000, close to mach .93. The plane pulls go= od and as you can hear the motor makes alot more noise then the prop does. = I have several guys tell me no way that I can run the prop that fast but pr= oof is hard to deny. =C2=A0 Ben www.haaspowerair.com --- On Sat, 10/17/09, Al Gietzen wrote: From: Al Gietzen Subject: [FlyRotary] Static rpm To: "Rotary motors in aircraft" Date: Saturday, October 17, 2009, 10:13 AM Chris; =C2=A0 Only=C2=A0cuz it was mentioned....I=C2=A0usually do achieve about 6000 rpm = static.=C2=A0 I am using a 2nd gen turbo block with a medium street port.= =C2=A0 I am guessin' the street port brings my static up a bit.=C2=A0 This = is with a 2.17 B drive from Tracy and an=C2=A0Ivo in flight=C2=A0adjustable= prop set at a fine pitch.=C2=A0 When I go course, it drops about 200 rpm. At some point you=E2=80=99ll want to consider a larger prop or more pitch.= =C2=A0 Typically your static rpm with cruise pitch should be in the neighbo= rhood of 2450-2550 (so 5300 =E2=80=93 5500 on the engine). As it is ,you=E2= =80=99ll find you can=E2=80=99t go WOT in flight without over-speeding your= prop. Are you sure the IVO is going to full pitch? =C2=A0 I get about 5400 static, and can reach about 6300-6350 in flight.=C2=A0 Tha= t=E2=80=99s a bit over 2900 on the Catto prop, which is speced for 3000 max= .=C2=A0 I=E2=80=99d guess the max on the IVO should be a bit less. =C2=A0 Anyway, you must be generating serious power.=C2=A0 What are the specs on y= our prop? =C2=A0 Al G --0-1760037737-1255819058=:99043 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable
Hi Guys... Just to add some data to the = conversation.
I run a Ivo prop and switch between two different blade designs. = Both are 76" dia and both are set up for inflight adjustability.
 
facts.
my ignition has 4400 rpm chips in them. redrive ratio is 1.43-1. I usu= ally run 4400 engine rpm on take off and climb. this gives a prop rpm of 30= 76 and at 50f temp that works out to tip speed of 695.5 and .922 mach. Prop= pulls real strong at this rpm, anything over that and it starts to lay dow= n. It appears my Ivo is pretty effecient till about .94 or so. I have not h= ad the balls to pull the chips out and take it to 1.0 mach but...=
 
 
the motor was just under the chip rpm or about 4350 or so. temp was 26= f,  prop rpm  around  3000, close to mach .93. The plane pul= ls good and as you can hear the motor makes alot more noise then the prop d= oes. I have several guys tell me no way that I can run the prop that fast b= ut proof is hard to deny.
 
Ben
www.haaspowerair.com
--- On Sat, 10/17/09, Al Gietzen <ALVentures@cox.net>= wrote:

From: Al Gietzen <ALVentures@cox.net>
Su= bject: [FlyRotary] Static rpm
To: "Rotary motors in aircraft" <flyrot= ary@lancaironline.net>
Date: Saturday, October 17, 2009, 10:13 AM
=

Chris;

 

Only cuz it was mentioned....I usually do achieve about= 6000 rpm static.  I am using a 2nd gen turbo block with a medium stre= et port.  I am guessin' the street port brings my static up a bit.&nbs= p; This is with a 2.17 B drive from Tracy and an Ivo in flight ad= justable prop set at a fine pitch.  When I go course, it drops about 2= 00 rpm.

At some point you= =E2=80=99ll want to consider a larger prop or more pitch.  Typically y= our static rpm with cruise pitch should be in the neighborhood of 2450-2550= (so 5300 =E2=80=93 5500 on the engine). As it is ,you=E2=80=99ll find you = can=E2=80=99t go WOT in flight without over-speeding your prop. Are you sur= e the IVO is going to full pitch?

 

I get about 5400 st= atic, and can reach about 6300-6350 in flight.  That=E2=80=99s a bit o= ver 2900 on the Catto prop, which is speced for 3000 max.  I=E2=80=99d= guess the max on the IVO should be a bit less.

 

Anyway, you must be= generating serious power.  What are the specs on your prop?

 

Al G<= /DIV>

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