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  #11  
Old 08-14-2007, 12:02 PM
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Ironflight Ironflight is offline
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Quote:
Originally Posted by Jamie
Near zero drag does not count.

Oh, you just need to think outside the box! Drag is the product of Drag Coefficient and Dynamic Pressure, right? Everyone reduces drag by attacking Drag Coefficient, but nobody ever just reduces the Q-Bar to zero!!

However you get to near-zero drag is good, isn't it?

Paul
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RV-8 - N188PD - "Valkyrie"
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  #12  
Old 08-14-2007, 12:25 PM
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Quote:
Originally Posted by Jamie
Huh? Can you clarify this?

GPS antennas don't care which direction they're pointed. They're simply taking the time deltas from all the satellites' signals (and processing precision position data from the bird) and computing the receiver's position.
The Bendix Skymap IIIC has a hinged antenna which was mounted on the glare shield. During maintenance, it was inadvertently flipped down. Not only was the speed whacky but position was off about 15 miles. I don't know the technical nuances but when flipped back the proper way, normal function returned at the same time.
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Turbo Subaru EJ22, Marcotte M-300, IVO, RV6A C-GVZX flying from CYBW since 2003- 420 hrs. on the Hobbs,
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  #13  
Old 08-14-2007, 12:43 PM
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Jamie Jamie is offline
 
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Quote:
Originally Posted by rv6ejguy
The Bendix Skymap IIIC has a hinged antenna which was mounted on the glare shield. During maintenance, it was inadvertently flipped down. Not only was the speed whacky but position was off about 15 miles. I don't know the technical nuances but when flipped back the proper way, normal function returned at the same time.
Ahh..I guess if you were getting bad signals and your location was jumping around -- that makes sense. If you jumped 15 miles from your current position in two seconds it would calculate some pretty darn high speeds.

The only reason I pointed it out was I had a very trusted friend come over to my house and checked out my project when it was still in the garage. He looked at my antenna and said, "yeah, your GPS antenna mount looks good, but you've got it mounted backward -- it's going to show you going backward".

I stared at it for a second and he just cracked up laughing.
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  #14  
Old 08-14-2007, 01:56 PM
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Yeah, my airplane ICON made a very fast 2-3 second trip across the screen- trouble was the scene outside did not match the screen... what the... I was movin' like a UFO.

Oops, way over 250 knots in the control zone!
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Turbo Subaru EJ22, Marcotte M-300, IVO, RV6A C-GVZX flying from CYBW since 2003- 420 hrs. on the Hobbs,
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http://www.sdsefi.com/aircraft.html
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  #15  
Old 08-14-2007, 07:35 PM
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DeltaRomeo DeltaRomeo is offline
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Quote:
Originally Posted by Ironflight
Oh, you just need to think outside the box! Drag is the product of Drag Coefficient and Dynamic Pressure, right? Everyone reduces drag by attacking Drag Coefficient, but nobody ever just reduces the Q-Bar to zero!!
However you get to near-zero drag is good, isn't it?
Paul
Jerry Maguire: I love you. You... you complete me. And I just...
Dorothy: Shut up, just shut up. You had me at "reducing Q-bar to zero".

And that is why I'm not a screenwriter....
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  #16  
Old 08-14-2007, 10:08 PM
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ScottSchmidt ScottSchmidt is offline
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Default 299.6 mph (260.5 knots)

I hope RV-10's can enter too. I figured since you were building one it would be OK.

I know I have 299.6 mph on my Garmin 430. I hit it while decending from 12,500 into St. George UT. The tail wind was right around 80-90 mph.
I will get a picture next time I'm at the hanger. I was most upset at myself that I didn't hit 300 mph. I only needed .4 mph. If I would have just decreased a little more drag I could have made it.

I know it should be in knots. I keep everything in knots except my 430. People in the back can easily see the 430 and they like to know speed in mph. If it is in knots, I get the question "how fast is that in mph?"
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Last edited by ScottSchmidt : 08-14-2007 at 10:26 PM.
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  #17  
Old 08-14-2007, 11:05 PM
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Default 254mph

Quote:
Quote:
Originally Posted by pierre smith
Wow!! That's almost a 90 MPH tailwind! Where did you happen to find that kinda tailwind, Dan? My best has been 245 MPH after a cold front came through at 8500'.

Pierre

Well,,, here’s mine. This was a few months ago flying from Albuquerque, NM back too Oklahoma at 11,500'..... Had a decent tailwind! I think someone from up above was telling me to get my tail home very soon and get the you know what out of N.M. B.T.W.,,, it was a bad date anyway. She was not my type.

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  #18  
Old 08-15-2007, 10:00 AM
hngrflyr hngrflyr is offline
 
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A year and a half ago, I was making 209 KTS between Medford, Oregon and Eugene in my 0-320 powered RV-6. I had taken a friend to Medford to pick up a 180 hp RV-6A. He took off before I did and I landed at Eugene before he did. To be fair, he landed on the parallel runway and the tower made him extend his downwind. I was on the ground about 30 seconds ahead of him.
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  #19  
Old 08-15-2007, 10:16 AM
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mark manda mark manda is offline
 
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Default 7a 201kts.

I have 182 kts indicated and just below it in the corner is GS at 201 kts. IIRC

I can't quite see it im the pict. Put me on the top ten Leader board!

http://www.pbase.com/mark2nite/image/83646533/original
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  #20  
Old 08-15-2007, 10:53 AM
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kentb kentb is offline
 
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Talking Dosen't count....

Quote:
Originally Posted by Dave C
How about slowest and lowest....
(In the "trench" 500 agl at 90kts in a C-170)


Dave C
-7 Flying
You were still at 4793 ft.
You need to head over to death valley.

Kent
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