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03-29-2015, 03:28 PM
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Join Date: Apr 2011
Location: Cincinnati, OH
Posts: 2,791
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GoPro fairing - min drag
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Steve Melton
Cincinnati, OH
RV-9A, Tip-up, Superior O-320, roller lifters, 160HP, WW 200RV, dual impulse slick mags, oil pressure = 65 psi, EGT = 1300F, flight hours = 800+ for all
Simplicity is the art in design.
My Artwork is freely given and published and cannot be patented.
www.rvplasticparts.com
Last edited by Steve Melton : 03-29-2015 at 04:07 PM.
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03-29-2015, 04:15 PM
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Join Date: Sep 2006
Location: Defiance, MO
Posts: 1,674
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Do you notice you need more rudder to yaw?  You're adding more vertical surface aft of the CG so you should be getting an increase in yaw stability.
Great that it reduced the wobble, now you need to put a small flap on it and add in one of those active servos from the RC world and you have active stabilization.
Excellent experimentation!
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Philip
RV-6A - 14+ years, 950+ hours
Based at 1H0 (Creve Coeur)
Paid dues yearly since 2007
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03-29-2015, 04:25 PM
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Join Date: Apr 2011
Location: Cincinnati, OH
Posts: 2,791
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I didn't notice any handling difference. direct xwind 10 G20 and bumpy, so not a good day to notice any fine handling differences. it's not rigid. I could disconnect the fairing at the velcro by hand with less than a pound of force if I pushed at the trailing edge. the good news, it didn't fall off.
are you talking about a yaw damper?
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Steve Melton
Cincinnati, OH
RV-9A, Tip-up, Superior O-320, roller lifters, 160HP, WW 200RV, dual impulse slick mags, oil pressure = 65 psi, EGT = 1300F, flight hours = 800+ for all
Simplicity is the art in design.
My Artwork is freely given and published and cannot be patented.
www.rvplasticparts.com
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03-29-2015, 04:32 PM
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Join Date: Dec 2009
Location: Boulder, CO
Posts: 4,435
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Quote:
Originally Posted by plehrke
Do you notice you need more rudder to yaw?  You're adding more vertical surface aft of the CG so you should be getting an increase in yaw stability.
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Low aspect ratio decreases the lift-curve slope, so there's minimal side force developing with sideslip angle. In other words, it's not effective as a fin.
I'd be more concerned with a tail-low landing.
Dave
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03-30-2015, 01:10 AM
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Join Date: Aug 2006
Location: Taylor Texas
Posts: 812
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That is kinda long...
The Granville Bros (Gee Bee fame) found that a 3-1 ratio of length to width had the least drag vs sfc area. Beech or Boeing found the same thing with engine cowlings. So, your fairing is quite a bit longer than required.
I applaud your ingenuity tho!
Carry on!
Mark
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03-30-2015, 01:25 AM
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Join Date: Sep 2011
Location: WV22
Posts: 849
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Cool idea and as mentioned previously, I'd shorten it up a bit. Less chance of the Velcro giving way from a side load if you find the need to slip.
Is that balsa?
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RV-4 0320\D3G 160, Whirlwind 200GA 70".
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03-30-2015, 07:16 AM
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Join Date: Jul 2006
Location: State of Bliss
Posts: 396
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Clever
A very clever approach!
Could have commercial potential!
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Ch?z King
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03-30-2015, 08:19 AM
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Join Date: Jan 2010
Location: Destin
Posts: 1,543
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seems like you'd have a better time with the garmin VIRB over the go pro due to its shape, have you thought about that?
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03-30-2015, 11:14 AM
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Join Date: Nov 2007
Location: Paris ( France )
Posts: 38
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Or maybe a Drift HD Ghost as per attached photo/Users/mikegreene/Desktop/IMG_0627.jpg/Users/mikegreene/Desktop/IMG_0636.jpg
Mike
Last edited by tullow : 03-30-2015 at 11:21 AM.
Reason: Sorry don't know how to attach photos !!
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