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dashvii(at)hotmail.com
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 Posted: Tue Jan 23, 2007 3:47 pm Post subject: best glide V. AOA |
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The easiest way that I've found to determine a best glide speed is to do a
power off decent at select airspeeds and record the amount of decent versus
a certain time period. The clock and altimeter haver to be utilized as the
rate of climb indicator is a trend instrument. A start and end altitude is
best. Then it's pretty easy to plot and get a best fit line. At the top of
that line is where the least amount of sink for a given distance is. You
can do this in probably 5 minutes and get a good indication. If you really
want to refine it then you get the range of numbers where the trend reverses
and you go up and do another set within those numbers. All angle of attack
indicators that I am aware of give you an arbitrary AOA unit which doesn't
relate to the degrees. I don't believe that an AOA indicator would allow
you to get the precise number for a best glide. I'm not really sold on the
indicators that don't have to be calibrated for your specific aircraft
either because different airfoils stall at some pretty different angles of
attack.
I haven't really got any time flying an AOA indicator though. Perhaps some
of you who have a lot more time with the instrument can express what you
think of a non-aircraft specific AOA Indicator? Brian W.
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Kayberg(at)AOL.COM
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| Posted: Tue Jan 23, 2007 6:51 pm Post subject: best glide V. AOA |
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I have an AOA kit that was designed for an RV6A If anyone is interested in it, let me know.
I have no interest in it.
Doug Koenigsberg
In a message dated 1/23/2007 6:49:16 PM Eastern Standard Time, dashvii(at)hotmail.com writes:
| Quote: | --> Lightning-List message posted by: "Brian Whittingham" <dashvii(at)hotmail.com>
The easiest way that I've found to determine a best glide speed is to do a
power off decent at select airspeeds and record the amount of decent versus
a certain time period. The clock and altimeter haver to be utilized as the
rate of climb indicator is a trend instrument. A start and end altitude is
best. Then it's pretty easy to plot and get a best fit line. At the top of
that line is where the least amount of sink for a given distance is. You
can do this in probably 5 minutes and get a good indication. If you really
want to refine it then you get the range of numbers where the trend reverses
and you go up and do another set within those numbers. All angle of attack
indicators that I am aware of give you an arbitrary AOA unit which doesn't
relate to the degrees. I don't believe that an AOA indicator would allow
you to get the precise number for a best glide. I'm not really sold on the
indicators that don't have to be calibrated for your specific aircraft
either because different airfoils stall at some pretty different angles of
attack.
I haven't really got any time flying an AOA indicator though. Perhaps some
of you who have a lot more time with the instrument can express what you
think of a non-aircraft specific AOA Indicator? Brian W.
|
[quote][b]
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