From: VTAILJEFF@aol.com
Message-ID: <f4.9e2d315.282aa37f@aol.com>
Date: Wed, 9 May 2001 09:43:27 EDT
Subject: Re: Am I Wrong?
To: lancair.list@olsusa.com
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Reply-To: lancair.list@olsusa.com

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Re: Am I wrong (about not monitoring IAS, TAS, etc.) -- Answer, yes you could 
be dead wrong. All of your airspeed limitations are based on IAS --indicated 
airspeed or Mach and not groundspeed. Vne. Vno, Va, Vs etc. so if you don't 
know, or don't care you could inadvertently overspeed your airplane, stall 
your airplane,  or otherwise hurt your airplane-- and therefore yourself. 

If you had an engine out you would want to fly best glide speed or best L/D 
max AOA. 

Your landing gear and flaps care what speed you put them down and up. 

If you are going to fly efficiently then you also need to know Vx, Vy for 
climb situations. 

TAS matters, too. It is the "no wind" speed your aircraft is flying. Flight 
planning is generally done "no wind"  with an eye toward winds aloft 
forecasts.   

So if you just use groundspeed ---then what do you use for the above 
situations?

Jeff Edwards
ATP, CFII, MEI, DPE -- (and if that isn't enough)-- aircraft accident 
investigator
"people are dying to meet me-- business is good"
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