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-----Original Message-----
From: John Wright <jwrightdo@worldnet.att.net>
To: Larry Klaas <ldkatbend@transport.com>
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 <ldkatbend@transport.com>
>To: jwrightdo@worldnet.att.net <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
>>
>>
>>
>
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