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06-13-2017, 10:54 AM
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Join Date: Jul 2013
Location: Clarkston, MI
Posts: 659
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Quote:
Originally Posted by bret
I wonder about this....on a off shore race boat they have what they call a stepped hull, it allows air to enter under the bottom to introduce air bubbles between the boat and water surface, to release the suction of the water and go faster. Would micro vortex generators in the paint imperfections do the same?
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I always think of the Mythbusters episode where they explored whether dimples such as the ones on golf balls reduced drag; would a dimpled car get better mileage? Turns out, to their surprise, it was confirmed. I'm going to lean heavily on that reasoning if I end up with significant orange peel... |
06-13-2017, 11:03 AM
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Join Date: Jan 2005
Location: SC
Posts: 12,887
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[quote=bret;1180124...Would micro vortex generators in the paint imperfections do the same?[/QUOTE]
Probably not because of the "boundary layer".
https://en.m.wikipedia.org/wiki/Boun...ayer_thickness
__________________
Bill R.
RV-9 (Yes, it's a dragon tail)
O-360 w/ dual P-mags
Build the plane you want, not the plane others want you to build!
SC86 - Easley, SC
www.repucci.com/bill/baf.html
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06-13-2017, 01:05 PM
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Join Date: Feb 2010
Location: Gardnerville Nv.
Posts: 2,828
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Every Top Fuel Dragster I've seen going 300+ MPH was painted.......so......Ok, never mind, might be the 11,000 HP or something 
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7A Slider, EFII Angle 360, CS, SJ.
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06-13-2017, 07:01 PM
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Join Date: Aug 2016
Location: Asheville, NC
Posts: 2,092
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golf balls?
Quote:
Originally Posted by RV Jerry
...a paint job with heavy orange peel...
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That works for golf balls, right?
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(2020 dues paid)
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07-10-2017, 10:31 AM
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Join Date: Mar 2007
Location: Sonoma County
Posts: 3,821
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Quote:
Originally Posted by mturnerb
When painting the airplane, simply make some adjustments to the airspeed indicator: Change "MPH" to "Kts" and you're 15% faster!
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Are you sure......... 
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VAF #897 Warren Moretti
2019 =VAF= Dues PAID
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07-10-2017, 11:32 AM
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Join Date: Sep 2007
Location: Central IL
Posts: 5,514
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It worked for dozer blades- only in reverse
Quote:
Originally Posted by snopercod
That works for golf balls, right?
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A certain earth moving research department showed that the addition of bumps spaced over a dozer blade actually gave better performance than the smooth blade. The best blade shapes work by shearing off a layer and rolling the collected material. Apparently, the bumps reduced the viscous drag of material. Totally impractical to manufacture, but a an odd success.
Disclosure: air, fluids (water), and regolith do not have the same flow properties.
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Bill
RV-7
Lord Kelvin:
“I often say that when you can measure what you are speaking about,
and express it in numbers, you know something about it; but when you
cannot measure it, when you cannot express it in numbers, your knowledge
is of a meager and unsatisfactory kind.”
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07-10-2017, 05:17 PM
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Join Date: Jul 2006
Location: Eagle, Id
Posts: 102
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Much faster with paint
My RV-6 is 200+ mph faster with paint. Keep in mind that that is with a really good wax job and that it never flew without paint so the actual speed gain might be a scosh less.
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Steve Hamer
RV-6
Eagle, ID
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07-10-2017, 06:32 PM
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Join Date: Jan 2016
Location: Southwest
Posts: 1,108
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Yes
Yes paint makes the plane goes faster.
Without paint, eventually the wings will fall off and the plane will be slower.
__________________
John S
WARNING! Information presented in this post is my opinion. All users of info have sole responsibility for determining accuracy or suitability for their use.
Dues paid 2020, worth every penny
RV9A- Status:
Tail 98% done
Wings 98% done
Fuselage Kit 98% done
Finishing Kit 35% canopy done for now
Electrical 5% in work
Firewall Forward 5% in work
www.pilotjohnsrv9.blogspot.com
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