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06-12-2017, 07:40 AM
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Join Date: Nov 2011
Location: East TN
Posts: 564
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Can't say for an RV as I only flew our RV9A with paint but can say definitely that our Lancair gained between 5 - 10 kts after the repaint.
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Lancair 235/340
RV-9A (2013 - 2016)
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06-12-2017, 07:46 AM
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Join Date: Nov 2006
Location: Oklahoma
Posts: 672
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Wax it.
After you polish it, put on a coat of wax.
After selecting the link below, scroll to the article "wax effects on drag"
https://cafe.foundation/v2/research_reports.php
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Joe Schneider
RV-7, IO-360, BA Hartzell, N847CR
Flying since 2008
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06-12-2017, 07:59 AM
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Join Date: Nov 2011
Location: East TN
Posts: 564
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Look up REJEX on this site and amazon for reviews.
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Lancair 235/340
RV-9A (2013 - 2016)
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06-12-2017, 11:35 AM
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Join Date: Dec 2005
Location: Mahomet, Illinois
Posts: 2,195
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Not sure about speed impact, but Rejex is the greatest stuff ever for making easy bug removal. I use it on leading edges and all the "buggy" surfaces on the RV, and all my cars. GREAT stuff! 
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Terry Ruprecht
RV-9A Tip-up; IO-320 D2A
S. James cowl/plenum
(Dues paid thru Nov '18)
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06-12-2017, 11:41 AM
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Join Date: Dec 2011
Location: Livermore, CA
Posts: 6,797
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Quote:
Originally Posted by FORANE
Can't say for an RV as I only flew our RV9A with paint but can say definitely that our Lancair gained between 5 - 10 kts AFTER THE REPAINT.
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My interpretation of this data: the original paint slowed you down.
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06-12-2017, 03:47 PM
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Join Date: May 2008
Location: Martinsville, IN
Posts: 454
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Paint makes you slower
I have to pull back on the throttle and take fewer flights in order to afford getting mine painted.
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06-12-2017, 03:57 PM
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Join Date: Oct 2008
Location: Lake Country, B.C. Canada
Posts: 2,416
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more data points needed!
So I would expect almost no measurable difference on a flush-riveted polished vs painted surface....surely there are 1932 NACA tests for this?????
my new ride has lots of domed rivets, and I wonder if putting a vinyl wrap over those surfaces wouldn't 'smooth' out the airflow over those heads. yes, they'd all be .002" higher, so not 'hiding' the bump, but perhaps bridging the transitions. ( Yes, it's painted, so can't quantify that effect).
....ok you guys with little wind tunnels in your hangars.....let us know how this all plays out??!?
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Perry Y.
RV-9a - SOLD!....
Lake Country, BC
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06-13-2017, 09:08 AM
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Join Date: Jan 2009
Location: Chino, CA
Posts: 202
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Many years ago I had built a canard style airplane with a very slick paint job my hanger partner had a paint job with heavy orange peel and he had a fast airplane so to make it faster he decided to give it a slick paint job. Well his stall speed went up and top speed went down, he was not happy.
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Jerry Scott
Rocket II
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06-13-2017, 09:16 AM
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Join Date: Feb 2010
Location: Gardnerville Nv.
Posts: 2,828
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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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7A Slider, EFII Angle 360, CS, SJ.
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06-13-2017, 10:48 AM
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Join Date: Jan 2005
Location: SC
Posts: 12,887
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My thinking is that most of the weight of the paint is aft of the CG and as everyone knows, tail heavy planes tend to fly faster.
Just a guess on my part and I could be way off base.
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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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