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12-20-2010, 10:19 AM
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Join Date: Jul 2007
Location: Delta, CO/Atlin, BC
Posts: 2,389
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Drag video
Ever wonder why the fairings on gear legs are so important? An interesting old video about drag illustrates dramatically:
http://www.youtube.com/watch?v=ftq8jTQ8ANE
cheers,
greg
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Greg Arehart
RV-9B (Big tires) Tipup @AJZ or CYSQ
N 7965A
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12-20-2010, 10:33 AM
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Senior Curmudgeon
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Join Date: Sep 2005
Location: Dayton Airpark, NV A34
Posts: 15,408
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Cool!!
We all "know" about drag, but it is pretty amazing to actually see it in action.
Thanks, Merry Christmas.
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Mike Starkey
VAF 909
Rv-10, N210LM.
Flying as of 12/4/2010 
Phase 1 done, 2/4/2011
Sold after 240+ wonderful hours of flight.
"Flying the airplane is more important than radioing your plight to a person on the ground incapable of understanding or doing anything about it."
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12-20-2010, 10:33 AM
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Join Date: Jan 2005
Location: Venice, Fl
Posts: 1,020
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Video
Thanks Greg for the link. I knew that the fairings made a difference but didn't know it was that much (the same round cross section 9.3 times as high as the aerodynamic fairing)
Good info!!
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Gary Palinkas - Gman.... VAF #161
Venice, Fl
RV-6 "Sassy" Flying 400 hrs since Oct 2011
Lycoming 0-360 A1A, FP Sensenich Prop
SARL #19 .... Van's Calendar March 2015
Although exempt several ways, =VAF= Dues paid to support this awesome site/family
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12-20-2010, 10:42 AM
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VAF Moderator / Line Boy
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Join Date: Jan 2005
Location: Dayton, NV
Posts: 12,247
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It says a lot about streamlined antennas versus simple wire rods, doesn't it? It might seem funny that a much larger blade transponder antenna is better than the tiny little ball-bearing on a rod, but it's true! Which reminds me, I need to order some antennas for the -3...where's that link to Delta Pop again? 
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Paul F. Dye
Editor at Large - KITPLANES Magazine
RV-8 - N188PD - "Valkyrie"
RV-6 (By Marriage) - N164MS - "Mikey"
RV-3B - N13PL - "Tsamsiyu"
A&P, EAA Tech Counselor/Flight Advisor
Dayton Valley Airpark (A34)
http://Ironflight.com
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12-20-2010, 10:46 AM
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Join Date: Feb 2010
Location: Gardnerville Nv.
Posts: 2,828
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WOW! that is a great demonstration
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7A Slider, EFII Angle 360, CS, SJ.
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12-20-2010, 10:52 AM
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Senior Curmudgeon
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Join Date: Sep 2005
Location: Dayton Airpark, NV A34
Posts: 15,408
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Quote:
Originally Posted by Ironflight
! Which reminds me, I need to order some antennas for the -3...where's that link to Delta Pop again? |
http://www.deltapopaviation.com/Delt...tion/Home.html
Merry Christmas
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Mike Starkey
VAF 909
Rv-10, N210LM.
Flying as of 12/4/2010
Phase 1 done, 2/4/2011
Sold after 240+ wonderful hours of flight.
"Flying the airplane is more important than radioing your plight to a person on the ground incapable of understanding or doing anything about it."
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12-20-2010, 11:01 AM
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Join Date: Feb 2007
Location: Sutter Creek, CA
Posts: 842
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As if I did not know that I needed to get my gear leg fairings on!! Wow! What an eye opening demonstration!
Thanks, Greg!
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Mark Ohlau
RV-6 N506MM VAF #1410
2017 Donation Made
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12-20-2010, 02:17 PM
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Join Date: Jan 2005
Location: northern Virginia (DC area)
Posts: 198
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Shape and Flow
Quote:
Originally Posted by Greg Arehart
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That video is one of the experiments Shapiro presents in this book:
Shape and Flow: The Fluid Dynamics of Drag
http://www.amazon.com/Shape-Flow-Flu.../dp/B0007J6AA8
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Alex Roup
RV-12 (empennage) #120407
Northern VA
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12-20-2010, 02:33 PM
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Join Date: May 2005
Location: Canby, Oregon
Posts: 1,786
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Round is bad....
So would it effect my bent-belly comm antenna performance if I built a fiberglass fairing around it with micro-bead?
Clean and scuff than with some thick fiberglass mold a small fairing around the rod.
Kent
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Kent Byerley
RV9A N94KJ - IO320, CS, tipup
AFS 3500, TT AP, FLYING....
Canby, Or
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12-20-2010, 03:08 PM
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Join Date: Jul 2007
Location: Delta, CO/Atlin, BC
Posts: 2,389
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Kent,
Makes sense to me you would lose some drag. I built a homemade pitot/AOA probe out of 1/4" Al tubing and made a similar epoxy fairing around it. Gained two knots (in case Bob Axsom is reading.... ). I'm considering whether to replace my transponder antenna....
cheers,
greg
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Greg Arehart
RV-9B (Big tires) Tipup @AJZ or CYSQ
N 7965A
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