X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Mon, 15 Nov 2010 07:30:42 -0500 Message-ID: X-Original-Return-Path: Received: from snt0-omc3-s47.snt0.hotmail.com ([65.54.51.84] verified) by logan.com (CommuniGate Pro SMTP 5.3.10) with ESMTP id 4577054 for lml@lancaironline.net; Fri, 12 Nov 2010 16:46:57 -0500 Received-SPF: pass receiver=logan.com; client-ip=65.54.51.84; envelope-from=bill_kennedy_3@hotmail.com Received: from SNT139-W21 ([65.55.90.137]) by snt0-omc3-s47.snt0.hotmail.com with Microsoft SMTPSVC(6.0.3790.4675); Fri, 12 Nov 2010 13:46:22 -0800 X-Original-Message-ID: X-Original-Return-Path: bill_kennedy_3@hotmail.com Content-Type: multipart/alternative; boundary="_a0323216-774e-4ccf-9a98-8f2ded0152ab_" X-Originating-IP: [71.111.125.230] From: Bill Kennedy X-Original-To: Subject: RE: [LML] Re: LNC2 Legacy Performance questions X-Original-Date: Fri, 12 Nov 2010 13:46:22 -0800 Importance: Normal In-Reply-To: References: MIME-Version: 1.0 X-OriginalArrivalTime: 12 Nov 2010 21:46:22.0174 (UTC) FILETIME=[0BF7D7E0:01CB82B3] --_a0323216-774e-4ccf-9a98-8f2ded0152ab_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Service ceiling is the altitude where your climb rate is 100 foot per minut= e. To: lml@lancaironline.net Date: Fri=2C 12 Nov 2010 16:41:09 -0500 From: casey.gary@yahoo.com Subject: [LML] Re: LNC2 Legacy Performance questions I don't own a Legacy (or a Continental)=2C but I take a shot at some of the= questions. Comments in ((brackets))=2CFrom:"Craig Jimenez" To:Questions: I see a service ceiling of 18=2C000' published by = Lancair. Is that a legally binding limitation? ((I don't know of any legal= ly binding reason for that unless they include an oxygen system that is lim= ited to 18=2C000. That would be a legal limitation. But then it might be better called an "opera= ting limitation" since the term "service ceiling" usually is when the rate = of climb drops to less than 100 ft/minute. Are the following numbers credi= ble for a 10:1 compression IO-550 with one Light Speed Plasma ignition? = KTAS gph 263 19.8 (flat out) 253 17.1 241 14.5 : : 180 7.8((I can't comment except for the 19.8 GPM "flat out". If you are assuming it = is 75% power ROP=2C then it sounds logical. If you are saying flat out mea= ns at sea level=2C full throttle and max rpm=2C full rich the number would = be closer to 30 GPH. For a fairly stock IO-550N installation (e.g. 8.5:1) a= t 8=2C000'=2C what numbers would you see LOP=2C with and without electronic= ignition?((fuel flow would probably be around 14=2C but I can't comment on= the speed)) Since much of my trip is above 8=2C000'=2C what would the above performance numbers be at 12=2C 16= =2C and 18=2C000'?((again=2C don't know about speed=2C but at 12=2C000 feet= I burn about 12.3 GPH at 12=2C000 and 2500 rpm. It depends on temperature= and rpm.)) Apart from keeping CHTs cool=2C what pilot and maintenance tech= niques will increase engine life?((Running LOP most all the time is=2C I be= lieve=2C the biggest factor. Doing that my plugs will go 200 hours between= cleaning. Running LOP will also reduce the peak cylinder pressure=2C whic= h I think is a big factor for a 10:1 engine. Some will say to change oil more often that recommended=2C but I think that won't do a thing. LOP= operation will reduce oil contamination significantly. And keeping the cy= linder head temperature below 400 will help a lot)) How many cylinders woul= d I expect to replace in 2000 hours of flying careful LOP?((You should expe= ct no cylinder service in 2000 hours running LOP. But the 10:1 compression= will increase the loading=2C and probably wear=2C on the rings=2C so I wou= ld change that to "you can HOPE that there will be no cylinder service")) W= hat time-frame did you guys start seeing problems with Performance Engines?= Any thoughts on Lycon engines?((I've been running engines built by Lycon = for many years and have been satisfied. Not perfect=2C perhaps=2C but good= enough that I'm "satisfied". But that's always been with Lycoming engines= - after all=2C the "Lyc" in Lycon is capitalized=2C but the "con" is not..= ..:-))=20 = --_a0323216-774e-4ccf-9a98-8f2ded0152ab_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Service ceiling is the altitude where your climb rate is 100 foot per minut= e.

To: lml@lancaironline.net
Date: Fri=2C= 12 Nov 2010 16:41:09 -0500
From: casey.gary@yahoo.com
Subject: [LML]= Re: LNC2 Legacy Performance questions

<= span class=3D"ecxApple-style-span" style=3D"font-size: 16px=3B">I don't own= a Legacy (or a Continental)=2C but I take a shot at some of the questions.=  =3BComments in ((brackets))=2C
=
&nbs= p=3B
I see a service ceiling of 18=2C000' published by Lancair.&nbs= p=3B Is that a legally binding limitation? =3B
((I don't know o= f any legally binding reason for that unless they include an oxygen system = that is limited to 18=2C000.  =3BThat would be a legal limitation.  =3BBut then it might be better called an= "operating limitation" since the term "service ceiling" usually is when th= e rate of climb drops to less than 100 ft/minute. =3B
 = =3B
Are the following numbers credible for a 10:1 compression = =3BIO-550 with one Light Speed Plasma ignition? =3B
 =3B &n= bsp=3BKTAS =3B =3B gph
 =3B  =3B263 =3B =3B 19.8= (flat out)
 =3B  =3B253 =3B =3B 17.1
 =3B  = =3B241 =3B =3B 14.5
 =3B =3B =3B  =3B: =3B&n= bsp=3B =3B =3B =3B  =3B :
 =3B  =3B180 =3B&n= bsp=3B =3B 7.8
((I can't comment except for the 19.8 GPM "flat out".  =3BIf you are assum= ing it is 75% power ROP=2C then it sounds logical.  =3BIf you are sayin= g flat out means at sea level=2C full throttle and max rpm=2C full rich the= number would be closer to 30 GPH.
 =3B
For a fairly st= ock IO-550N installation (e.g. 8.5:1) at 8=2C000'=2C what numbers would you= see LOP=2C with and without electronic ignition?
((fuel flow would= probably be around 14=2C but I can't comment on the speed))
 = =3B
Since much of my trip is above 8=2C000'=2C what would the above performance numbers be at 12=2C 16= =2C and 18=2C000'?
((again=2C don't know about speed=2C but at 12= =2C000 feet I burn about 12.3 GPH at 12=2C000 and 2500 rpm.  =3BIt depe= nds on temperature and rpm.))
 =3B
Apart from keeping C= HTs cool=2C what pilot and maintenance techniques will increase engine life= ?
((Running LOP most all the time is=2C I believe=2C the biggest fa= ctor.  =3BDoing that my plugs will go 200 hours between cleaning.  = =3BRunning LOP will also reduce the peak cylinder pressure=2C which I think= is a big factor for a 10:1 engine.  =3BSome will say to change oil more often that recommended=2C but I think that won't do a thing. &nbs= p=3BLOP operation will reduce oil contamination significantly.  =3BAnd = keeping the cylinder head temperature below 400 will help a lot))
&= nbsp=3B
How many cylinders would I expect to replace in 2000 hours = of flying careful LOP?
((You should expect no cylinder service in 2= 000 hours running LOP.  =3BBut the 10:1 compression will increase the l= oading=2C and probably wear=2C on the rings=2C so I would change that to "y= ou can HOPE that there will be no cylinder service"))
 =3B
What time-frame did you guys start seeing problems with Performance En= gines? =3B Any thoughts on Lycon engines?
((I've been running e= ngines built by Lycon for many years and have been satisfied.  =3BNot p= erfect=2C perhaps=2C but good enough that I'm "satisfied".  =3BBut that= 's always been with Lycoming engines - after all=2C the "Lyc" in Lycon is c= apitalized=2C but the "con" is not....:-))
 =3B

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