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N1BZRich(at)AOL.COM
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 Posted: Tue Jan 23, 2007 7:51 pm Post subject: AOA indicators and other test data info |
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I have used AOA extensively in the F-4, both for landing and for max performing the airplane in air combat (dog fights). For those purposes it is good. However for general /sport aviation uses, my thought is that it would not be worth the effort or expense - just "eye candy". And no, some specific AOA will not tell you best L/D. We know what Vx, Vy, and best glide speed are for the prototype. Nick determined these numbers during the flight test period. You will do the same thing during your test period for your specific aircraft. You basically do what Brain was talking about, but the more times you run the test and the more accurate you are in holding specific speeds, the more accurate your results are. I spend about five hours of flight time doing this for 31BZ. I would start a climb at 1000 feet at some specific airspeed and try to have my speed nailed passing 2,000 feet where I hit the stop watch. Then passing 3,000 feet, stop the stop watch and note the time in seconds it took to climb the 1000 feet at what ever speed you are testing. Then since you are now above 3000, pull the power back and hold some specific glide speed while you start down. Hit the stop watch as you pass 3000, holding your speed and stop the watch when you go through 2000 feet. Note the time in seconds it took at that specific glide speed. Now you have one data point for rate of climb and one data point for one glide speed. Now do this over and over until you have covered a range of speeds both below and above what you think will be your best climb and best glide. Yes, it gets boring. Then graph the numbers for both climb and glide and it will become apparent what best climb and glide speeds are. There are some other considerations, but for this e-mail, I think you get the picture.
Blue Skies,
Buz
[quote][b]
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pequeajim
Joined: 03 Sep 2006
Posts: 708
Location: New Holland, PA
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| Posted: Tue Jan 23, 2007 8:05 pm Post subject: AOA indicators and other test data info |
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Buz:
When you do the glide speed testing, it is all done straight, no turns?
On 1/23/07, N1BZRich(at)aol.com (N1BZRich(at)aol.com) <N1BZRich(at)aol.com (N1BZRich(at)aol.com)> wrote: [quote] I have used AOA extensively in the F-4, both for landing and for max performing the airplane in air combat (dog fights). For those purposes it is good. However for general /sport aviation uses, my thought is that it would not be worth the effort or expense - just "eye candy". And no, some specific AOA will not tell you best L/D. We know what Vx, Vy, and best glide speed are for the prototype. Nick determined these numbers during the flight test period. You will do the same thing during your test period for your specific aircraft. You basically do what Brain was talking about, but the more times you run the test and the more accurate you are in holding specific speeds, the more accurate your results are. I spend about five hours of flight time doing this for 31BZ. I would start a climb at 1000 feet at some specific airspeed and try to have my speed nailed passing 2,000 feet where I hit the stop watch. Then passing 3,000 feet, stop the stop watch and note the time in seconds it took to climb the 1000 feet at what ever speed you are testing. Then since you are now above 3000, pull the power back and hold some specific glide speed while you start down. Hit the stop watch as you pass 3000, holding your speed and stop the watch when you go through 2000 feet. Note the time in seconds it took at that specific glide speed. Now you have one data point for rate of climb and one data point for one glide speed. Now do this over and over until you have covered a range of speeds both below and above what you think will be your best climb and best glide. Yes, it gets boring. Then graph the numbers for both climb and glide and it will become apparent what best climb and glide speeds are. There are some other considerations, but for this e-mail, I think you get the picture.
Blue Skies,
Buz
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dashvii(at)hotmail.com
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| Posted: Tue Jan 23, 2007 8:15 pm Post subject: AOA indicators and other test data info |
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Yes, the glide testing is done wings level. I forgot to mention what Buz
did. He's describing a 1000 foot block of airspace that he sets up and fine
tunes his flying skills to make sure that everything is established before
getting to the testing section of airspace. If you're interested I have
some good books that I can recommend. Some are more for the average joe and
others are a little heavier reading. Brian W.
_________________________________________________________________
The MSN Entertainment Guide to Golden Globes is here. Get all the scoop.
http://tv.msn.com/tv/globes2007/?icid=nctagline2
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N1BZRich(at)AOL.COM
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| Posted: Tue Jan 23, 2007 8:26 pm Post subject: AOA indicators and other test data info |
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In a message dated 1/23/2007 11:11:56 P.M. Eastern Standard Time, pequeajim(at)gmail.com writes:
| Quote: | When you do the glide speed testing, it is all done straight, no turns?
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Yes, that is the way I did it.
Buz
[quote][b]
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