Return-Path: Received: from mtiwmhc09.worldnet.att.net ([204.127.131.18]) by truman.olsusa.com (Post.Office MTA v3.5.1 release 219 ID# 0-64832U3500L350S0V35) with ESMTP id com for ; Sun, 13 Feb 2000 22:47:53 -0500 Received: from default- ([12.74.128.52]) by mtiwmhc09.worldnet.att.net (InterMail v03.02.07.07 118-134) with SMTP id <20000214035314.YEIF7877@default-> for ; Mon, 14 Feb 2000 03:53:14 +0000 Message-ID: <000d01bf769f$99e284a0$34804a0c@default-> Reply-To: "John Wright" From: "John Wright" To: "LML" Subject: Fw: AV Web Article Date: Sun, 13 Feb 2000 20:57:19 -0700 X-Mailing-List: lancair.list@olsusa.com Mime-Version: 1.0 <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> << Lancair Builders' Mail List >> <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> >> -----Original Message----- From: John Wright To: Larry Klaas Date: Sunday, February 13, 2000 8:54 PM Subject: Re: AV Web Article >Larry, I feel most comfortable flying my iv-p- at the upper teens partly >because I have the option of flight following or instruments if I choose, >but I am reasonabley comfortable up to FL250 because I've been there a >number of times before and it is still low enough that I think I have more >options than I would at FL290 in an emergency. One thing addressed during >the high altitude endorsement given to me by the person who use to run the >altitude chamber here in Colorado Springs is paying attention to Mach >numbers. He pointed out from the graph in the iv -p POH that the Mach >number at FL290 is about 195 kts indicated, ie above that air speed you are >exceeding Vne. I think flying at FL250 over overcast is a different >decision particularly if there is icing than flying at the same altitude VMC >because if the cloud deck rises you are forced higher and you have fewer >options. The other thing I learned during the high altitude check out is >that having enough standby oxygen to fly another hour is a real advantage >because at 300kts TAS you can often find better weather conditions if you >are caught over unfavorable IMC. As the article points out the time of >useful conciousness is three to six minutes at 25,000' vs. 30 min. at >18,000'. So in answer to your question I think I like flying in the high >teens but I can be lured up into the flight levels by favorable tail winds >and good weather. Other's thoughts? Also, a question for the group: Is >there any logic to pressurizing the cabin to 3.5 to 4 psi rather than 5psi >thinking that the cabin is being physically stressed less and less of an >explosive decompression if that should happen? Incidentally, I didn't >pressurize for a few months! It took that long to get all of the leaks >plugged! Good luck with the maiden flight, that's a great day. John >-----Original Message----- >From: Larry Klaas >To: jwrightdo@worldnet.att.net >Date: Sunday, February 13, 2000 3:47 PM >Subject: AV Web Article > > >>I'm about 45 days from my first flight on my 4P. Read the AV web article >>you mentioned. >> >>So how high do you fly now after reading it? >> >>Larry Klaas >>21725 Rickard Rd >>Bend, OR 97702 >>Tel: 541-389-2900 Fax: 208-361-5849 >> >> >> > >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> LML website: http://www.olsusa.com/Users/Mkaye/maillist.html Builders' Bookstore: http://www.buildersbooks.com/lancair Please send your photos and drawings to marvkaye@olsusa.com. >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>