Return-Path: Received: from [65.54.168.123] (HELO hotmail.com) by logan.com (CommuniGate Pro SMTP 4.2.5) with ESMTP id 527590 for flyrotary@lancaironline.net; Thu, 11 Nov 2004 09:30:31 -0500 Received-SPF: pass receiver=logan.com; client-ip=65.54.168.123; envelope-from=lors01@msn.com Received: from mail pickup service by hotmail.com with Microsoft SMTPSVC; Thu, 11 Nov 2004 06:30:01 -0800 Received: from 65.54.97.142 by BAY3-DAV19.phx.gbl with DAV; Thu, 11 Nov 2004 14:29:18 +0000 X-Originating-IP: [65.54.97.142] X-Originating-Email: [lors01@msn.com] X-Sender: lors01@msn.com From: "Tracy Crook" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: best cruise altitude and power Date: Thu, 11 Nov 2004 09:29:16 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0041_01C4C7D0.E9E17B50" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: MSN 9 X-MimeOLE: Produced By MSN MimeOLE V9.10.0009.2900 Seal-Send-Time: Thu, 11 Nov 2004 09:29:16 -0500 Message-ID: X-OriginalArrivalTime: 11 Nov 2004 14:30:01.0466 (UTC) FILETIME=[ED90D5A0:01C4C7FA] This is a multi-part message in MIME format. ------=_NextPart_000_0041_01C4C7D0.E9E17B50 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MessageCorrect on all counts Rusty. I'm using the airplane as a dyno in = these tests which has very little to do with the way airplanes are = actually used. As I have said in the past, top speed and HP numbers are = good for only one thing - Hangar bragging rights. My comment about = never testing above 6000 applies only to the recent Renesis testing. As an example of why it makes no sense to go fast down low, I can fly = 202 mph at 1000 ft (not full throttle) while sweating profusely in a hot = cockpit while burning about 16 GPH. I can go the same speed at 14000 ft = in complete comfort while burning 8.25 GPH (numbers from earlier 2nd gen = 13B engine). Tracy (installing longer intake runners in shoebox manifold - Turbo = flyers beware : ) ----- Original Message -----=20 From: Russell Duffy=20 To: Rotary motors in aircraft=20 Sent: Wednesday, November 10, 2004 8:56 AM Subject: [FlyRotary] Re: best cruise altitude and power, turbo folks = may delete- was Re: EWP Info- Lynn? The 7300 rpm test was at 1500 ft. IAS was bouncing (rough air) around = 224 and the EM2 TAS was showing 235 but I have not calibrated the TAS = function yet. Its probably on the optimistic side. Or maybe oil on the = belly makes me go faster : )=20 From memory, I have not had the Renesis over 6000 ft nor have I even = attempted to measure maximum speed above 2000 ft. Tracy (making longer intake runners for the shoebox manifold)=20 Thanks for the info Tracy. Oddly, I've only done top speed tests = above 5000 feet recently, so I don't have anything to directly compare. I'm wondering what the "normal" best cruise speed altitude will be for = us. With a certified relic (engine), you're only allowed to run 75% = power continuously, so the best cruise speed is the highest altitude = where you can still make 75% power. As I understand it, that's about = 8000 feet. Van has always been irritated by people giving speed figures = for RV's without following the "standard" practice of measuring it at = 8000 feet. In our case though, we're not limited by the 75% power rule. = =20 It's hard to let go of the 8000 foot rule of thumb, but I guess it = really doesn't apply. I'm sure there's a level of HP that would be = considered a safe max for extended operation, but I have no idea what = that is. Has anyone designated a max HP level for continuous operation? = =20 Rusty (haven't got anything done on my oil scoop or TB inlet) ------=_NextPart_000_0041_01C4C7D0.E9E17B50 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Message
Correct on all counts Rusty.  I'm using the airplane as a dyno = in=20 these tests which has very little to do with the way airplanes are = actually=20 used.  As I have said in the past, top speed and HP numbers are = good for=20 only one thing -  Hangar bragging rights.  My comment about = never=20 testing above 6000 applies only to the recent Renesis testing.
 
As an example of why it makes no sense to go fast down low, I = can fly=20 202 mph at 1000 ft (not full throttle) while sweating profusely in = a hot=20 cockpit while burning about 16 GPH. I can go the same speed at 14000 ft = in=20 complete comfort while burning 8.25 GPH (numbers from earlier 2nd=20 gen 13B engine).
 
Tracy (installing longer intake runners in shoebox manifold - Turbo = flyers=20 beware : )
----- Original Message -----
From: Russell=20 Duffy
To: Rotary motors in = aircraft
Sent: Wednesday, November 10, = 2004 8:56=20 AM
Subject: [FlyRotary] Re: best = cruise=20 altitude and power, turbo folks may delete- was Re: EWP Info- = Lynn?

The 7300 rpm=20 test was at 1500 ft. IAS was bouncing (rough air) around 224 and = the EM2=20 TAS was showing 235 but I have not calibrated the TAS function = yet.  Its=20 probably on the optimistic side.  Or maybe oil on the belly makes = me go=20 faster : ) 
From memory, I have not had the Renesis over 6000 ft nor have I = even=20 attempted to measure maximum speed above 2000 ft.
 
Tracy  (making longer intake runners for the shoebox = manifold) 
 
Thanks for the info Tracy.  Oddly, I've only done top = speed tests=20 above 5000 feet recently, so I don't have anything to directly=20 compare.
 
I'm=20 wondering what the "normal" best cruise speed altitude will be = for=20 us.  With a certified relic (engine), you're only allowed to run = 75%=20 power continuously, so the best cruise speed is the highest altitude = where you=20 can still make 75% power.  As I understand it, that's about 8000=20 feet.  Van has always been irritated by people giving speed = figures for=20 RV's without following the "standard" practice of measuring it at 8000 = feet.  In our case though, we're not limited by the 75% power = rule. =20
 
It's=20 hard to let go of the 8000 foot rule of thumb, but I guess it really = doesn't=20 apply.  I'm sure there's a level of HP that would be considered a = safe=20 max for extended operation, but I have no idea what that is.  Has = anyone=20 designated a max HP level for=20 continuous operation?   
 
Rusty (haven't got anything done on my oil scoop or TB=20 inlet)
 
 
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