Date: 24 Oct 97 04:33:15 From: firstname.lastname@example.org Organization: EarthLink Network, Inc. References: 1 2 3
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On 16 Oct 97 00:44:12 , email@example.com (Terry Schell) wrote: >firstname.lastname@example.org writes: ><snip> >>Why, is it any easier to fly angle of attack instead of airspeed? > >Because the important AOA's (best glide, stall, etc) do not vary with >gross weight. Finding best glide using airspeed requires knowing >your weight at that time and then using a table/computer. Stall is >even worse because you are very concerned about the effect of turns on >stall speed. You need to know actual gross weight and then compute the >force in the turn and *then* look it up in a table to find the stall >speed. With an AOA meter you just *look* at it; it will tell you >exactly how much lift you can extract before a stall. Any error in >calculating your weight at that moment will result in blowing both >computations when flying by airspeed. It is not nearly as simple (and inexpensive) as everyone would like to believe. 1) The pilot would need to know the aircraft configuration (flaps) and look at a table to know what AOA to fly to (sound alot like having to know the weight and looking at a table to know what speed to fly). Or you would have to have a much more sophisticated (and expensive) electronic system that keeps track of such things and displays the correct AOA target to the pilot. 2) Some speeds the pilot flys are not mearly a function of being a certain percentage above stall speed. 3) What about when tthe wing is contaminated from ice. Since there are aircraft that do not have full-time anti-ice/deice systems under some conditions, the resulting ice contamination will reduce the AOA for stall. Under conditions such as this the AOA system is no better than airspeed. There are many things that must be considered. People make comments implying that the FAA, ICAO, or whatever, agency they care to talk about needs to act. What makes everyone believe they are not? Simply because the do no react instantly to the NTSB recommendation? In this country there are laws that specify what the rule-making process is. Many people feel the the process takes to long (including the time to review any NTSB recommendation). Whats amazes me is that many people like to complain that the FAA does not follow its own regulations while others complain when they do. If you don't like the process, than get the laws changed, but don't complain when they follow them.