X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fmailhost02.isp.att.net ([204.127.217.102] verified) by logan.com (CommuniGate Pro SMTP 5.4c2) with ESMTP id 4935592 for flyrotary@lancaironline.net; Thu, 07 Apr 2011 11:03:53 -0400 Received-SPF: none receiver=logan.com; client-ip=204.127.217.102; envelope-from=bbradburry@bellsouth.net Received: from desktop (adsl-85-145-79.mco.bellsouth.net[98.85.145.79]) by isp.att.net (frfwmhc02) with SMTP id <20110407150315H0200ovfb2e>; Thu, 7 Apr 2011 15:03:16 +0000 X-Originating-IP: [98.85.145.79] From: "Bill Bradburry" To: "'Rotary motors in aircraft'" References: In-Reply-To: Subject: RE: [FlyRotary] Re: Tracy RV-8 Questions Date: Thu, 7 Apr 2011 11:03:17 -0400 Message-ID: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0009_01CBF513.66A64EB0" X-Mailer: Microsoft Office Outlook 11 Thread-Index: AcvzraAI2FfoosB9Sp2tLpVLNW5xPgBhweTQ X-MimeOLE: Produced By Microsoft MimeOLE V6.0.6001.18049 This is a multi-part message in MIME format. ------=_NextPart_000_0009_01CBF513.66A64EB0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Tracy, Could you post some pictures of your "5" pitot tubes sticking out of the cowl for inlets"? I am still working out some cooling issues and would really like to see what you have done. Bill B _____ From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Tracy Sent: Tuesday, April 05, 2011 12:22 PM To: Rotary motors in aircraft Subject: [FlyRotary] Re: Tracy RV-8 Questions Hi Doug, I have 48 hours on the RV-8 but almost all of them done on short test flights while working out various development problems so I have never done tests on the intended use of the airplane (long distance cruise at high altitude). The most interesting thing (to me anyway) is that the fuel burn at low altitude is virtually identical at the same speeds as the RV4 with a Renesis. This is partly due to the longer wing and the high pitch prop which makes the engine rpm 1000 rpm lower than the -4 at the same speed. I haven't done formal glide ratio tests but it is very obvious that it's significantly better than the -4, also due to the longer wing. I thought the stall speed was much lower too but my previous statement about it being down to 45 mph was due to a bad air speed sensor in the Bluemountain EFIS. It's really closer to 50. Top speed is airframe limited at 230 mph. That's reached at around 25" MP. Cooling is working OK and when I install the bellmouth inlet rings on the inlets I think it will be in final form. Right now I have what amounts to 5" pitot tubes sticking out of the cowl for inlets. Not good at high angle of attack in climb. Climb at solo flight & 1/2 fuel is around 3750 fpm. Seat of the pants impression: One hell of a fun airplane to fly. Tracy On Mon, Apr 4, 2011 at 6:27 AM, wrote: Tracy if you get a chance would mind taking a minute to post the latest news on your RV-8 20B? I know I am curious about your cruise numbers and fuel burn and also what your feelings are about it's handling and overall performance based on the extended wing you put on it. Also, do you have the cooling system tweaked now where you like it or are there further gains to had / made? Take care, Doug Lomheim RV-9A / FWF / Electrical / Canopy Hope to resume work by mid - May. ------=_NextPart_000_0009_01CBF513.66A64EB0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Tracy,

Could you post some pictures of = your “5" pitot tubes sticking out of the cowl for inlets”?

 

I am still working out some cooling issues and would really like = to see what you have done.

 

Bill B

 

From: = Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Tracy
Sent: Tuesday, April 05, = 2011 12:22 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: = Tracy RV-8 = Questions

 

Hi Doug,
    I have 48 hours on the RV-8 but almost all of them = done on short test flights while working out various development problems so I = have never done tests on the intended use of the airplane (long distance = cruise at high altitude).

  The most interesting thing (to me anyway) is that the fuel burn = at low altitude is virtually identical at the same speeds as the RV4 with a Renesis.   This is partly due to the longer wing and the high = pitch prop which makes the engine rpm 1000 rpm lower than the -4 at the same speed. 

I haven't done formal glide ratio tests but it is very obvious that it's significantly better than the -4, also due to the longer wing.  I = thought the stall speed was much lower too but my previous statement about it = being down to 45 mph was due to a bad air speed sensor in the Bluemountain EFIS.  It's really closer to 50.   Top speed is airframe = limited at 230 mph.  That's reached at around 25" MP.

Cooling is working OK and when I install the bellmouth inlet rings on = the inlets I think it will be in final form.   Right now I have = what amounts to 5" pitot tubes sticking out of the cowl for = inlets.   Not good at high angle of attack in climb.   Climb at solo = flight & 1/2 fuel is around 3750 fpm.

Seat of the pants impression:   One hell of a fun airplane to = fly.

Tracy

On Mon, Apr 4, 2011 at 6:27 AM, <dlomheim@aol.com> wrote:

Tracy if you get a chance would mind taking a minute to post the = latest news on your RV-8 20B?  I know I am curious about your cruise = numbers and fuel burn and also what your feelings are about it's handling and = overall performance based on the extended wing you put on it.  Also, do you = have the cooling system tweaked now where you like it or are there further = gains to had / made?

 

=

Take = care,

 

=

Doug = Lomheim

RV-9A / FWF / Electrical / = Canopy

 

=

Hope to resume work by mid - May.

 

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