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#231
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aerodynamics of gliding
That would not be possible......only "momentary". You can't "keep"
"everything else" constant. Yes, there would be a "momentary" increase in lift......but...... Glider would experience "acceleration", change in velocity, and or direction. (Most likely glider would "nose up" (change in direction) then "slow down" (change in velocity) finally resume steady flight with greater drag giving steeper glide angle. Once "stabilized" flight is resumed, vector analysis shows flaps do not increase lift. Yes, the coefficient of lift has changed but not the actual lift (other than a really, really tiny reduction due to new flgith path) Similar for spoilers Cookie At 09:40 20 March 2009, The Real Doctor wrote: On 20 Mar, 01:15, Bob Cook wrote: If we draw vector force diagrams of two identical gliders, one with flaps extended, and the other with flaps retracted, we can easily see that "lift" is essentially the same in both cases. What happens if you extend the flaps on a glider while keeping everything else (AoA, airspeed) constant? Ian |
#232
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Aerodynamics of Towing
In message
, The Real Doctor writes On 20 Mar, 07:30, Jim White wrote: Cookie...are you drinking enough? The weather in your part of the world must be bad as you do not seem to leave much time for flying. Dunno where he is, but I'm in Scotland. Need I say more? I sincerely hope you were flying on the 22nd February. Fantastic wave day, and a Sunday! -- Surfer! Email to: ramwater at uk2 dot net |
#233
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Aerodynamics of Towing
In the words of Foghorn Leghorn, "That was a joke son, a joke. How come
you're not laughin'?" Anyway, we have some of the best soaring weather here in Blairstown. Just check out the OLC! As you might have noticed my posts are usually in the early morning or late evening. The middle of my day is filled up with flying! (Lucky me) But, beyond RAS and flying I have no life at all! Cookie At 09:45 20 March 2009, The Real Doctor wrote: On 20 Mar, 07:30, Jim White wrote: Cookie...are you drinking enough? The weather in your part of the world must be bad as you do not seem to leave much time for flying. Dunno where he is, but I'm in Scotland. Need I say more? Ian |
#234
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Aerodynamics of Towing
On 20 Mar, 12:20, Surfer! wrote:
In message , The Real Doctor writes On 20 Mar, 07:30, Jim White wrote: Cookie...are you drinking enough? The weather in your part of the world must be bad as you do not seem to leave much time for flying. Dunno where he is, but I'm in Scotland. Need I say more? I sincerely hope you were flying on the 22nd February. *Fantastic wave day, and a Sunday! Alas not. The glider is awaiting some work and I don;t normally fly in the winter anyway. Ian |
#235
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aerodynamics of gliding
You guys have proven 2 fundamental truths.
1) In any engineering discussion. If you don't define terms at the start, you just chase yourself around in a circle. 2) Pilots don't need to know much about aerodyanmics to fly well. Oh yeah, 3) Flight instructors explain these things more to make a point than to be accurate :-) Todd Smith 3S |
#236
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aerodynamics of gliding
On 20 Mar, 13:29, wrote:
You guys have proven 2 fundamental truths. 1) *In any engineering discussion. *If you don't define terms at the start, you just chase yourself around in a circle. What, exactly, do you mean by "circle"? 2) *Pilots don't need to know much about aerodyanmics to fly well. I suspect it only distracts from the task at hand. 3) Flight instructors explain these things more to make a point than to be accurate :-) And how. I just wish they'd tell the rest of us what the point is ... Ian |
#237
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Aerodynamics of Towing
At 00:45 20 March 2009, Bob Cook wrote:
You are on to something here. Get one of those geo surveys, and fly your glider only over areas of higher gravity. This extra gravity will give your glider extra power, and you will be the best glider pilot! Well, that should work. The important thing is that you have to find and use thermals only in *low* gravity areas, and then do your inter-thermal cruising in the *high* gravity areas. Next best thing to dynamic soaring. Jim Beckman |
#238
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aerodynamics of gliding
At 19:48 19 March 2009, Martin Gregorie wrote:
On Thu, 19 Mar 2009 13:09:30 -0500, Jim Logajan wrote: You're claim conflicts with that in the FAA "Pilot's Handbook of Aeronautical Knowledge": "Found on many gliders and some aircraft, high drag devices called spoilers are deployed from the wings to spoil the smooth airflow, reducing lift and increasing drag." Printing it in some official or semi-official publication doesn't make it right. But it *does* make it the right answer to the written test when that test is given by that same authority. For the test, concentrate not on what is necessarily true, but on what the FAA wants for an answer. After the written is out of the way, just learn to fly the aircraft. Jim Beckman |
#239
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Aerodynamics of Towing
The Real Doctor wrote:
On 20 Mar, 01:39, Doug Hoffman wrote: And lift(as we are using the term) without gravity is not possible. Aircraft in a 90 degree bank can still produce lift ... Without gravity how will you get the glider into a bank (or even to move)? Answer = not possible. Regards, -Doug |
#240
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aerodynamics of gliding
"The Real Doctor" wrote in message ... On 20 Mar, 01:15, Bob Cook wrote: If we draw vector force diagrams of two identical gliders, one with flaps extended, and the other with flaps retracted, we can easily see that "lift" is essentially the same in both cases. What happens if you extend the flaps on a glider while keeping everything else (AoA, airspeed) constant? Ian I have really been trying to avoid getting involved in this thread. It seem too much like "I'm smart and you're not". However, I just want to point out that to maintain the same AoA while lowering the flaps will require the pilot to lower the nose of the aircraft. This is due to the change to the wing's effective angle of incidence. I really question if it is posible to lower to flaps while keeping the AoA and airspeed constant. I know that maintaining a constant airspeed of 50 kts while lowering the flaps to 90 degrees on my HP-14 results in a 45+ degree nose down attitude. I am positive the wing's AoA changes while doing so. Respectfully, Wayne HP-14 "6F" http://www.soaridaho.com/Schreder |
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