Return-Path: Received: from mail.tsisp.com ([65.23.108.44] verified) by logan.com (CommuniGate Pro SMTP 4.2b1) with ESMTP-TLS id 3150514 for flyrotary@lancaironline.net; Wed, 07 Apr 2004 08:07:59 -0400 Received: from stevehome ([]) by mail.tsisp.com (Technical Support Inc.) with SMTP id BGA74184 for ; Wed, 07 Apr 2004 08:07:54 -0400 Reply-To: From: "Steve Brooks" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Help Rusty pick a prop Date: Wed, 7 Apr 2004 07:43:04 -0400 Message-ID: <000001c41c99$1b939f90$6400a8c0@WORKGROUP.local> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0001_01C41C77.948B2750" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook CWS, Build 9.0.2416 (9.0.2910.0) Importance: Normal In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1165 This is a multi-part message in MIME format. ------=_NextPart_000_0001_01C41C77.948B2750 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit MessageRusty, I have an IVO prop for my project. I have the 3 blade, but they also sent me the spacers to make it a 2 blade. I'm running a stock turbo, and they were not concerned about 2 or 3 blade. I started with the ground adjustable, but plan to add the in-flight adjustable after getting some time in the plane, and making sure that I don't have any issues with the prop. I think that the blade crack problem they had in the past were all with Lycomings, and due to the strong pulses. I shouldn't have these issues with the rotary. I have only run the prop and engine on the ground so far, but hope to be flying in another 5-6 weeks. My ground runs have been very strong. I think that I'll have to tie it down to run WOT. By the way, congrats on your 2nd 1st flight. Steve Brooks Cozy MKIV - sanding primer -----Original Message----- From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]On Behalf Of Russell Duffy Sent: Tuesday, April 06, 2004 11:10 PM To: Rotary motors in aircraft Subject: [FlyRotary] Help Rusty pick a prop OK, since Tracy keeps whining about my prop, let's talk about this. First, for those who don't know, I have a 68", 3 blade Warp Drive prop. It's currently not tapered, but Warp can taper the blades to get better top end, without sacrificing climb. They requested that I wait until I could give them pitch, rpm, and speed numbers before they tapered the tips, since they needed to make sure they didn't take off too much blade area. I have not done this yet, since I have only started flying the non-turbo (final) configuration. Here are the facts: - The plane is an RV-3. The "standard" prop length is 68", which gives 7 inches of clearance in two point attitude. - I have a 2.17 RD-1B drive, and I can't go to the 2.85 because of the left thrust built into my mount (at my request). - The 13B engine was build by Bruce T, with 9.7 rotors, and street porting. It is capable of running strong to 7500, and I would like that to be my top rpm at WOT at sea level. I am not afraid to run 7000 rpm continuous. - The plane is a toy, and performance is more important than economy. I would like to be able to run up to the 210 VNE easily, while maintaining spectacular climb performance. - I prefer adjustable pitch props, even if only ground adjustable. - I'm not afraid to run an IVO prop. The way I look at this, to get the power I want from this engine, I have to run high rpms. The only way I can do that is to stay with the 68" prop length. Warp required me to run a 3 blade for the power I expected, so a 2 blade was not an option. I didn't ask IVO about this, but they may require a 3 blade also. I came so very close to getting an IVO, just so I could use the in-flight adjustable prop. That may be the key to getting the best climb and cruise performance. Even now, I'm seriously thinking of ordering one, and trying to do the "cuff" thing that Tracy is doing if top speed is an issue. Funny thing is that some folks seem to have a problem with this, and some don't. OK, there you go. You'll notice that I really don't want to use a fixed pitch wood prop, unless that's clearly the best choice. Any recommendations will be very welcome. Cheers, Rusty (this is going to cost me) ------=_NextPart_000_0001_01C41C77.948B2750 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message
Rusty,
I have=20 an IVO prop for my project.  I have the 3 blade, but they also sent = me the=20 spacers to make it a 2 blade.  I'm running a stock turbo, and they = were not=20 concerned about 2 or 3 blade.
 
I=20 started with the ground adjustable, but plan to add the in-flight = adjustable=20 after getting some time in the plane, and making sure that I don't have = any=20 issues with the prop.  I think that the blade crack problem they = had in the=20 past were all with Lycomings, and due to the strong pulses.  I = shouldn't=20 have these issues with the rotary.
 
I have=20 only run the prop and engine on the ground so far, but hope to be flying = in=20 another 5-6 weeks.  My ground runs have been very strong.  I = think=20 that I'll have to tie it down to run WOT. 
 
By the=20 way, congrats on your 2nd 1st flight.
 
Steve=20 Brooks
Cozy=20 MKIV - sanding primer
 
-----Original Message-----
From: Rotary motors in = aircraft=20 [mailto:flyrotary@lancaironline.net]On Behalf Of Russell=20 Duffy
Sent: Tuesday, April 06, 2004 11:10 PM
To: = Rotary=20 motors in aircraft
Subject: [FlyRotary] Help Rusty pick a=20 prop

OK, since = Tracy keeps=20 whining about my prop, let's talk about = this.  
 
First, for = those who=20 don't know, I have a 68", 3 blade Warp Drive prop.  It's = currently not=20 tapered, but Warp can taper the blades to get better top end, without=20 sacrificing climb.  They requested that I wait until I could give = them=20 pitch, rpm, and speed numbers before they tapered the tips, since they = needed=20 to make sure they didn't take off too much blade area.  I have = not done=20 this yet, since I have only started flying the non-turbo (final)=20 configuration.
 
Here are the=20 facts:
 
- The plane = is an=20 RV-3.  The "standard" prop length is 68", which gives 7 inches of = clearance in two point attitude.
 
- I have a = 2.17 RD-1B=20 drive, and I can't go to the 2.85 because of the left thrust built = into my=20 mount (at my request).
 
- The 13B = engine was=20 build by Bruce T, with 9.7 rotors, and street porting.  It is = capable of=20 running strong to 7500, and I would like that to be my top rpm at WOT = at sea=20 level.  I am not afraid to run 7000 rpm continuous. =20
 
- The plane = is a toy, and=20 performance is more important than economy.  I would like to be = able to=20 run up to the 210 VNE easily, while maintaining spectacular climb=20 performance.
 
- I prefer = adjustable=20 pitch props, even if only ground adjustable.  =
 
- I'm not = afraid to run=20 an IVO prop.
 
The way I = look at this,=20 to get the power I want from this engine, I have to run high = rpms.  The=20 only way I can do that is to stay with the 68" prop length.  Warp = required me to run a 3 blade for the power I expected, so a 2 blade = was not an=20 option.  I didn't ask IVO about this, but they may require a = 3 blade=20 also.  I came so very close to getting an IVO, just so I could = use the=20 in-flight adjustable prop.  That may be the key to getting the = best climb=20 and cruise performance.  Even now, I'm seriously thinking of = ordering=20 one, and trying to do the "cuff" thing that Tracy is doing if top = speed is an=20 issue.  Funny thing is that some folks seem to have a problem = with this,=20 and some don't.  
 
OK, there you = go. =20 You'll notice that I really don't want to use a fixed pitch wood prop, = unless=20 that's clearly the best choice.  Any recommendations will be = very=20 welcome.  
 
Cheers,
Rusty (this = is going to=20 cost me) 
 
 
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