X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from wx-out-0506.google.com ([66.249.82.232] verified) by logan.com (CommuniGate Pro SMTP 5.2c1) with ESMTP id 2440575 for flyrotary@lancaironline.net; Tue, 30 Oct 2007 17:18:10 -0400 Received-SPF: pass receiver=logan.com; client-ip=66.249.82.232; envelope-from=cozy4pilot@gmail.com Received: by wx-out-0506.google.com with SMTP id i27so1944475wxd for ; Tue, 30 Oct 2007 14:17:33 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=beta; h=domainkey-signature:received:received:reply-to:from:to:in-reply-to:subject:date:message-id:mime-version:content-type:x-priority:x-msmail-priority:x-mailer:importance:x-mimeole; bh=Rt9Edc53IXvFKAUYji/SO+20c3es4Fbs/Zi40HSqrE0=; b=SgIYoSs6Ot6yBO0CazlE5ljg3gM8g2lCwLzg6kBU2q2IaR6UbL2o/IsF1Drv4WA6PpQUp88C6cs7NyuFnxTTlEAjHUTaX8nG2oFZPMFfdtwqZKN/3BNMsKqs4cvgvWXYH7HcUm6XmcJaoW0m7D8Y/zqfLOWXQeeH1PU5MnP/7FA= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=beta; h=received:reply-to:from:to:in-reply-to:subject:date:message-id:mime-version:content-type:x-priority:x-msmail-priority:x-mailer:importance:x-mimeole; b=ZuerOjYlE/7Iy0YCA0W7zbBHCeON3nDdv1jfAf+DxjyP30PlMaDMHLtCQUxQekiH3hFDBnR+uKBtnaugW2x1SDnegdMjwVM3DaCFzjnEmNlMrMsna+3Vy5wshmnQMY0H16Iplkpz7UnQ6kgLDI96LduuXqjx3Q3UORLphLZtllg= Received: by 10.70.68.11 with SMTP id q11mr13295094wxa.1193779052834; Tue, 30 Oct 2007 14:17:32 -0700 (PDT) Return-Path: Received: from HomePC ( [71.2.20.13]) by mx.google.com with ESMTPS id i36sm21293900wxd.2007.10.30.14.17.29 (version=SSLv3 cipher=OTHER); Tue, 30 Oct 2007 14:17:30 -0700 (PDT) Reply-To: From: "Steve Brooks" To: "Rotary motors in aircraft" In-Reply-To: Subject: RE: [FlyRotary] Rotary Cross Country Report Date: Tue, 30 Oct 2007 17:17:02 -0400 Message-ID: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_001A_01C81B18.B0388BC0" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook IMO, Build 9.0.6604 (9.0.2911.0) Importance: Normal X-MimeOLE: Produced By Microsoft MimeOLE V6.0.6000.16545 This is a multi-part message in MIME format. ------=_NextPart_000_001A_01C81B18.B0388BC0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Dave, Glad that you had such an uneventful trip. Must have been quite a rewarding trip. Your numbers are quite impressive, as well as interesting. It looks like you pay quite a fuel penalty above 5600 RPM. On those legs that you reported 5600 RPM and around 170 kits. a fuel burn of 10 gph is really quite acceptable. That is one think that didn't come up during the turbo discussions is the improved burn efficiency of the fuel/air mixture under boost conditions. I don't know 100% for sure that is true, but I have read it several times, and even given that half of them were wrong, the other half were most likely correct. You would probably have to run a MAP to MAP comparison in a same type aircraft between a turbo installation vs. a normally aspirated one, to know for sure. At any rate, thanks for sharing the numbers, Steve Brooks -----Original Message----- From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]On Behalf Of David Leonard Sent: Tuesday, October 30, 2007 11:04 AM To: Rotary motors in aircraft Subject: [FlyRotary] Rotary Cross Country Report I just finished a most excellent cross country in my Rotary RV-6 and wanted to share the stats and the adventure. I visited family in Boulder, CO, friends in Pensacola, and spent a week in Orlando including watching the shuttle launch and going to the rotary round up in Bell, Fl. I also delivered a prop to its buyer in Austin TX and traversed the country westbound in a single day. Best leg (Strong tailwinds fading in the end): K88-82J, 601 NM and 2.9 hrs on the hobbs. 23.6 gallons of MOGAS burned that I bought at K88 for $2.74/gal. That works out to 207 Knots Ground speed at 8.1 gal/hr. Yee ha! Of course, the winds play the deciding factor. I had a mix of winds over the course of the trip here are the overall stats: 4224 kn miles traveled 240 gallons burned $3.35 average fuel price (I had to buy 100LL on 2 occasions which brought up the average a little) $24 worth of 2-stroke oil burned. ($830 total paid for fuel and oil) 26.0 hrs on the hobbs That works out to: Average speed= 162 KTS Average Fuel Burn= 9.2 gal/hr Average cost/mile= $0.19 Those are GPS point to point numbers and include climb, taxi and heading variations. The other way to look at fuel burn/Cruise speed is to use a calibrated ASI and Fuel Flow insturment. I spent a couple hundred miles testing various settings after getting the fuel flow computer fully calibrated. Here are my data points taken in cruise, all were done > 100 LOP (more power available with richer mixtures or closure of the wastegate - not attempted this trip). Slight climbs or descents and changes in mixture probably account for the variations. (RV is hard to truly keep level especially when looking at other numbers and trying to write) (Redline is 7000 RPM) 150 KTAS @ 13.5k and 8.0 gal/hr 154 KTAS @ 15.5k and 8.3 gal/hr (5100 RPM) 160 KTAS @ 11.5k and 9.1 gal/hr 161 KTAS @ 15.5k and 8.7 gal/hr 162 KTAS @ 13.5k and 9.2 gal/hr 165 KTAS @ 13.5k and 10 gal/hr (5600 RPM) 172 KTAS @ 15.5k and 10.7 gal/hr (5600 RPM) 179 KTAS @ 15.5k and 12.0 gal/hr (5900 RPM) 181 KTAS @ 15.5k and 11.8 gal/hr 183 KTAS @ 13.5k and 12.3 gal/hr 185 KTAS @ 17.5k and 13.5 gal/hr (6000 RPM) - WOT 189 KTAS @ 17.5k and 13.4 gal/hr (6000 RPM) - WOT 193 KTAS @ 13.5k and 13.6 gal/hr (6100 RPM) - WOT Clearly not the same fuel economy as most lycoming installations, but not out of the ballpark either. After considering the lower price of MOGAS the hourly cost of flying is No issues encountered with the engine. Tracy noted that my gear leash seemed to be slightly larger than normal, and it increased during the trip home. So next weekend the drive is coming off for inspection and likely replacement of the snubbers. -- David Leonard Turbo Rotary RV-6 N4VY http://N4VY.RotaryRoster.net http://RotaryRoster.net ------=_NextPart_000_001A_01C81B18.B0388BC0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Dave,
Glad=20 that you had such an uneventful trip.  Must have been quite a = rewarding=20 trip.  Your numbers are quite impressive, as well as = interesting.  It=20 looks like you pay quite a fuel penalty above 5600 RPM.  On those = legs that=20 you reported 5600 RPM and around 170 kits.  a fuel burn of 10 gph = is really=20 quite acceptable. 
 
That=20 is one think that didn't come up during the turbo discussions is the = improved=20 burn efficiency of the fuel/air mixture under boost conditions. I don't = know=20 100% for sure that is true, but I have read it several times, and even = given=20 that half of them were wrong, the other half were most likely = correct.  You=20 would probably have to run a MAP to MAP comparison in a same type = aircraft=20 between a turbo installation vs. a normally aspirated one, to know for=20 sure.
 
At any=20 rate, thanks for sharing the numbers,
 
Steve=20 Brooks
-----Original Message-----
From: Rotary motors in = aircraft=20 [mailto:flyrotary@lancaironline.net]On Behalf Of David=20 Leonard
Sent: Tuesday, October 30, 2007 11:04 = AM
To:=20 Rotary motors in aircraft
Subject: [FlyRotary] Rotary Cross = Country=20 Report

I just finished a most excellent cross = country in=20 my Rotary RV-6 and wanted to share the stats and the adventure.  = I=20 visited family in Boulder, CO, friends in Pensacola, and spent a week = in=20 Orlando including watching the shuttle launch and going to the rotary = round up=20 in Bell, Fl.  I also delivered a prop to its buyer in Austin TX = and=20 traversed the country westbound in a single day.

Best leg = (Strong=20 tailwinds fading in the end):  K88-82J,  601 NM and 2.9 hrs = on the=20 hobbs.  23.6 gallons of MOGAS burned that I bought at K88 for=20 $2.74/gal.  That works out to 207 Knots Ground speed at 8.1 = gal/hr. =20 Yee ha!

Of course, the winds play the deciding factor.  I = had a=20 mix of winds over the course of the trip here are the overall = stats:
4224=20 kn miles traveled
240 gallons burned
$3.35 average fuel price (I = had to=20 buy 100LL on 2 occasions which brought up the average a little) =
$24 worth=20 of 2-stroke oil burned. ($830 total paid for fuel and oil)
26.0 hrs = on the=20 hobbs
That works out to:
Average speed=3D 162 KTS
Average = Fuel Burn=3D=20 9.2 gal/hr
Average cost/mile=3D $0.19

Those are GPS point to = point  numbers and include climb, taxi and heading = variations.  The=20 other way to look at fuel burn/Cruise speed is to use a calibrated ASI = and=20 Fuel Flow insturment.  I spent a couple hundred miles testing = various=20 settings after getting the fuel flow computer fully calibrated.  = Here are=20 my data points taken in cruise, all were done > 100 LOP (more power = available with richer mixtures or closure of the wastegate - not = attempted=20 this trip).  Slight climbs or descents and changes in mixture = probably=20 account for the variations.  (RV is hard to truly keep level = especially=20 when looking at other numbers and trying to write) (Redline is 7000 = RPM)=20

150 KTAS @ 13.5k and 8.0 gal/hr
154 KTAS @ 15.5k and 8.3 = gal/hr=20 (5100 RPM)
160 KTAS @ 11.5k and 9.1 gal/hr
161 KTAS @ 15.5k and = 8.7=20 gal/hr
162 KTAS @ 13.5k and 9.2 gal/hr
165 KTAS @ 13.5k and 10 = gal/hr=20 (5600 RPM)
172 KTAS @ 15.5k and 10.7 gal/hr (5600 RPM)
179 KTAS = @ 15.5k=20 and 12.0 gal/hr (5900 RPM)
181 KTAS @ 15.5k and 11.8 gal/hr
183 = KTAS @=20 13.5k and 12.3 gal/hr
185 KTAS @ 17.5k and 13.5 gal/hr (6000 = RPM)  -=20 WOT
189 KTAS @ 17.5k and 13.4 gal/hr (6000 RPM)  - WOT
193 = KTAS @=20 13.5k and 13.6 gal/hr (6100 RPM)  - WOT

Clearly not the = same fuel=20 economy as most lycoming installations, but not out of the ballpark=20 either.  After considering the lower price of MOGAS the hourly = cost of=20 flying is

No issues encountered with the engine.  Tracy = noted=20 that my gear leash seemed to be slightly larger than normal, and it = increased=20 during the trip home.  So next weekend the drive is coming off = for=20 inspection and likely replacement of the snubbers.


-- =
David=20 Leonard

Turbo Rotary RV-6 N4VY
http://N4VY.RotaryRoster.net
http://RotaryRoster.net=20
------=_NextPart_000_001A_01C81B18.B0388BC0--