X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from wf-out-1314.google.com ([209.85.200.174] verified) by logan.com (CommuniGate Pro SMTP 5.2.0) with ESMTP id 2784410 for flyrotary@lancaironline.net; Sun, 09 Mar 2008 16:39:50 -0400 Received-SPF: pass receiver=logan.com; client-ip=209.85.200.174; envelope-from=rwstracy@gmail.com Received: by wf-out-1314.google.com with SMTP id 28so1506587wfa.25 for ; Sun, 09 Mar 2008 13:39:10 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:message-id:date:from:sender:to:subject:in-reply-to:mime-version:content-type:references:x-google-sender-auth; bh=vYHF0W41Ze4tnrrbLqFf8GxorjO53ujIanfWmx69Duo=; b=vR22xl9PqnygDkHUcAI1JrQVYYjIAMyzaTR0AchBWlOKv1kCTQ4vFT+8MVLSdYzlonl7eFCDNGoLHqTjgMUAmrRdFplQTMl8Xfd72ixhxskDj2jw17uX0IL7g3IjZr0+SIAA3Ze0XmqysqgKxVIDUwaj+YyJwiSnJ8hNpxwh6QY= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:sender:to:subject:in-reply-to:mime-version:content-type:references:x-google-sender-auth; b=gGYZcjx3fwfsnR7obsa+Lql39cdlSfVYKVliEqYrg3RweCOYPNqT8kwpKWUX9VVuGiH8EtmYiRA0JA75z+jDPB3RzDc+pR9qPiAkIL+n5wmhJ64HKC0yALhnCiDvOyzsL+KysHJhpIoGI+zley+NgQVy8Pi4VmSUh2br6w3pDXM= Received: by 10.142.99.21 with SMTP id w21mr1435955wfb.55.1205095150422; Sun, 09 Mar 2008 13:39:10 -0700 (PDT) Received: by 10.143.125.5 with HTTP; Sun, 9 Mar 2008 13:39:10 -0700 (PDT) Message-ID: <1b4b137c0803091339t51478906t827084b79a571e6f@mail.gmail.com> Date: Sun, 9 Mar 2008 16:39:10 -0400 From: "Tracy Crook" Sender: rwstracy@gmail.com To: "Rotary motors in aircraft" Subject: Re: [FlyRotary] Re: direct drive- was Re: Anyone have an RD-1C for sale? In-Reply-To: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_Part_8125_25982137.1205095150416" References: X-Google-Sender-Auth: d2e7603cabf4e914 ------=_Part_8125_25982137.1205095150416 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Content-Disposition: inline Bobby answered the "how much HP" question with the HP chart - Looked like 112 HP at 4000 to me which is the RPM I would target. That was also with a stock manifold. With an intake manifold optimized for 4000 and adding a few ponies for a less restrictive exhaust system, I think 120 is do-able. And I think it could come in at least 50 lbs lighter than a Lyc O - 320. Another 5 or more pounds off the prop too. And that's normally aspirated. Turboing to 150 HP would be conservative. Only down side is the ~ 56 - 58" prop you would have to use. That would cost some takeoff & climb performance. Tracy (why the hell am I talking people out of gear drives :>) On Sun, Mar 9, 2008 at 4:02 PM, Bobby J. Hughes wrote: > RX8 hp chart. > > ------------------------------ > *From:* Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] *On > Behalf Of *Russell Duffy > *Sent:* Sunday, March 09, 2008 3:14 AM > *To:* Rotary motors in aircraft > *Subject:* [FlyRotary] Re: direct drive- was Re: Anyone have an RD-1C for > sale? > > Sure, that can work but why not something completely different? I want > to see someone do a direct drive 2 rotor (maybe even turboed) in the right > application and the RV-3 comes close. That would be Kool! > > Hi Tracy, > > Thanks for the comments, but you're not suckering me into this direct > drive idea :-) > > You've mentioned this before, but I just can't see the benefit. How much > HP would a 2 rotor make at 3000, 3500, and 4000 rpm? Anyone got a power > chart handy? Limiting the rpm of a rotary to direct drive speeds just > seems unnatural to me. > > Another point about the single rotor is that I'm trying to make the RV-3 > Sport Pilot compliant, and that will be easier to justify with a smaller > engine. Fortunately, I don't foresee any medical issues, but I'm also > fooling myself into believing this will be my last airplane. Please keep > the laughter to a minimum :-) > > Rusty (heading south in less than 5 days) > > PS- Just shoveled about 1000 lbs of snow from around the van. I can > easily see how people have heart attacks doing this. And yes, still with > Philips, but we just changed our name to Philips Healthcare. > > -- > Homepage: http://www.flyrotary.com/ > Archive and UnSub: > http://mail.lancaironline.net:81/lists/flyrotary/List.html > > ------=_Part_8125_25982137.1205095150416 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Content-Disposition: inline
Bobby answered the "how much HP" question with the HP chart - Looked like 112 HP at 4000 to me which is the RPM I would target.  That was also with a stock manifold.  With an intake manifold optimized for 4000 and adding a few ponies for a less restrictive exhaust system, I think 120 is do-able.  And I think it could come in at least 50 lbs lighter than a Lyc O - 320.  Another 5 or more pounds off the prop too.  And that's normally aspirated.  Turboing to 150 HP would be conservative.
 
Only down side is the ~ 56 - 58" prop you would have to use.  That would cost some takeoff & climb performance.
 
Tracy  (why the hell am I talking people out of gear drives :>)

On Sun, Mar 9, 2008 at 4:02 PM, Bobby J. Hughes <bhughes@qnsi.net> wrote:
RX8 hp chart.

From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Russell Duffy
Sent: Sunday, March 09, 2008 3:14 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: direct drive- was Re: Anyone have an RD-1C for sale?

Sure, that can work but why not something completely different?   I want to see someone do a direct drive 2 rotor (maybe even turboed) in the right application and the RV-3 comes close.   That would be Kool!   
 
Hi Tracy,
 
Thanks for the comments, but you're not suckering me into this direct drive idea :-)  
 
You've mentioned this before, but I just can't see the benefit.  How much HP would a 2 rotor make at 3000, 3500, and 4000 rpm?  Anyone got a power chart handy?   Limiting the rpm of a rotary to direct drive speeds just seems unnatural to me. 
 
Another point about the single rotor is that I'm trying to make the RV-3 Sport Pilot compliant, and that will be easier to justify with a smaller engine.  Fortunately, I don't foresee any medical issues, but I'm also fooling myself into believing this will be my last airplane.  Please keep the laughter to a minimum :-)  
 
Rusty (heading south in less than 5 days)
 
PS- Just shoveled about 1000 lbs of snow from around the van.  I can easily see how people have heart attacks doing this.  And yes, still with Philips, but we just changed our name to Philips Healthcare.     

--
Homepage:  http://www.flyrotary.com/
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