Return-Path: Received: from [24.25.9.103] (HELO ms-smtp-04-eri0.southeast.rr.com) by logan.com (CommuniGate Pro SMTP 4.2b3) with ESMTP id 3223046 for flyrotary@lancaironline.net; Sun, 09 May 2004 11:14:38 -0400 Received: from EDWARD (clt25-78-058.carolina.rr.com [24.25.78.58]) by ms-smtp-04-eri0.southeast.rr.com (8.12.10/8.12.7) with SMTP id i49FEaC9020054 for ; Sun, 9 May 2004 11:14:37 -0400 (EDT) Message-ID: <000801c435d8$5b081180$2402a8c0@EDWARD> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: What should you expect was : first flight Tracy's old prop. Date: Sun, 9 May 2004 11:14:42 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0005_01C435B6.D3BFAA10" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1409 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2800.1409 X-Virus-Scanned: Symantec AntiVirus Scan Engine This is a multi-part message in MIME format. ------=_NextPart_000_0005_01C435B6.D3BFAA10 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Message----- Original Message -----=20 From: Russell Duffy=20 To: Rotary motors in aircraft=20 Sent: Sunday, May 09, 2004 10:53 AM Subject: [FlyRotary] Re: first flight Tracy's old prop. Great flight report Rusty. You sound a little disappointed. =20 I AM disappointed in the current performance. My friends RV-3 with a = 160 HP Lycoming is nearly doubling my climb rate, with an almost = identical prop. At least I have proof that my engine isn't producing = the power that Tracy's is, so I just need to get to work on finding out = why. =20 Hey, Rusty, if it were easy, everyone would be doing it {:>) Step one will be a simple thing, changing plugs. I now have about 30 = or so hours on the engine, mostly with 100 LL. I've felt a couple of = times in the last two runs, where full throttle seemed to go over rich, = and leaning the mixture a little seemed to help. I'm wondering if this = might be Ed's plug sag??? I get approx 30 hours on a set of plugs while runing 100LL before the = SAG shows up. It starts with just one or two occurances of a flight and = frequently only on one rotor and proceeds to increase in frequency. My = indications are a drop in rpm and one (or both) of my EGT gauges will = show an approx 250-300F decrease. This would normally only last for a = minute or so, sometimes changing the mixture would kick it out of the = SAG. Step two will be a new intake, but I'm completely undecided as to how = I'll proceed. =20 Ed, you may not have a direct answer to this, but how about taking a = SWAG. How much rpm would you expect to gain by going from a typical = short intake, to a fairly well tuned intake? Are we talking hundreds, = or maybe 50? =20 Since Tracy and I had identical props by the same maker 68/72 and the = same model engine 90 Turbo II, both with high compression rotors, we = were about as identical as could get on engine/prop. Oh, yes, our = intake systems were very similar although not identical. We both would = get a nominal 5200 rpm static (on cold mornings due to the EDDIE effect = my static would go as high as 5600-5800 rpm). In my 120 mph (TAS) WOT = climbout I normally would get from 5600-5800 (depending on OAT). So if = you are not getting at least 5000 static, you have some tuning to do. Thanks for the vote of confidence, but the problem is that I'll be = obsessed with making this perform better, and I'll spend all my time = working on it, and not flying it. This isn't bad, since I need = something to tinker with, but it sure won't get the test hours flown off = anytime soon. =20 Hey, if I has spent my time flying instead of tinkering with the = engine, I would have over 1000 hours but not nearly as much fun {:>). = Think of all the gas money you save. Ed Anderson ------=_NextPart_000_0005_01C435B6.D3BFAA10 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Message
----- Original Message = -----
From:=20 Russell=20 Duffy
Sent: Sunday, May 09, 2004 = 10:53 AM
Subject: [FlyRotary] Re: first = flight=20 Tracy's old prop.


Great flight report Rusty.  You sound a little=20 disappointed. 

I AM disappointed in the current = performance.  My friends RV-3 with a 160 HP Lycoming is=20 nearly doubling my climb rate, with an almost identical = prop.  At=20 least I have proof that my engine isn't producing the power that = Tracy's=20 is, so I just need to get to work on finding out = why.  

Hey, Rusty, if it were easy, everyone would be = doing it=20 {:>)

Step one will be a simple thing, = changing=20 plugs.  I now have about 30 or so hours on the engine, mostly = with 100=20 LL.  I've felt a couple of times in the last two runs, where full = throttle seemed to go over rich, and leaning the mixture a little = seemed=20 to help.  I'm wondering if this might be Ed's plug=20 sag???

I get approx 30 hours on a set of plugs while = runing 100LL=20 before the SAG shows up.  It starts with just one or two = occurances of a=20 flight and frequently only on one rotor and proceeds to increase in=20 frequency.  My indications are a drop in rpm and one (or both) of = my EGT=20 gauges will show an approx 250-300F decrease.  This would = normally only=20 last for a minute or so, sometimes changing the mixture would kick it = out of=20 the SAG.

Step two will be a new intake, = but I'm=20 completely undecided as to how I'll proceed. 

Ed, you may not have a direct = answer to=20 this, but how about taking a SWAG.  How=20 much rpm would you expect to gain by going = from=20 a typical short intake, to a fairly well tuned intake?  Are = we=20 talking hundreds, or maybe 50?   

 Since Tracy = and I had=20 identical props by the same maker 68/72 and the same model engine 90 = Turbo II,=20 both with high compression rotors, we were about as identical as could = get on=20 engine/prop.  Oh, yes, our intake systems were very similar = although not=20 identical.  We both would get a nominal 5200 rpm static (on cold = mornings=20 due to the EDDIE effect my static would go as high as 5600-5800 = rpm). =20   In my 120 mph (TAS) WOT climbout I normally would get from = 5600-5800=20 (depending on OAT).  So if you are not getting at least 5000 = static, you=20 have some tuning to do.

Thanks for the vote of = confidence,=20 but the problem is that I'll be obsessed with making this perform = better, and=20 I'll spend all my time working on it, and not flying it.  This = isn't bad,=20 since I need something to tinker with, but it sure won't get the test = hours=20 flown off anytime soon. 

Hey, if I has spent my time flying = instead of=20 tinkering with the engine, I would have over 1000 hours but not nearly = as much=20 fun {:>).  Think of all the gas money you save.

Ed = Anderson

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