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12-20-2015, 10:36 AM
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Join Date: Mar 2012
Location: San Diego, CA
Posts: 133
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Mods and new cruise speed
Finally, I broke 170ktas with my 160hp 7A!!
The changes since last time was: vhf and vor antenna fairings, ailerons reflexed to match the flaps (-2deg), elevator trim rod fairings, aileron fences!
170ktas at 75% and 160ktas at 65%!
This is a 2-3ktas increase since last change.
So far I have a 12.7% drag reduction since phase 1. Flat plat drag has come done from 2.36sqft to 2.06sqft.
My cruise at 65% is almost the same as the cruise at 75% when I started modding!
Previous mod was primarily the wheel pants and tire seals.

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12-20-2015, 11:14 AM
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Join Date: Aug 2010
Location: McAlpin, FL
Posts: 253
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A couple of more ideas for you!
I sold my 160hp RV8A recently (based on a grass strip with seasonal terrain problems). I kept the plane very light with tight clearances and a number of speed mods. I typically flew at 200mph at 10,500 (2600rpm) when travelling. 205mph at 2700rpm. I think the biggest gains were from the following mods in order of benefit: 1. Cooling exit fairing 2. Shortened wingtips (only works for a very light plane). 3. Faired fuel drains and Xponder antenna (I combined these because I used the same process for all 3). 4. Flush tail strobe. 5. Deleted the external canopy handle.
The flush tail strobe was done by forming a 'window' out of lexan with the same shape as the bottom rudder fairing. I then cut away that part of the fairing and replaced it with the window. The LED strobe light was mounted inside.
The cooling exit fairing was copied from the ones seen on this forum, but made in 3 pieces. That made it a lot easier to form it. While on the subject of exit fairings,,, I made one for the RV6 I bought and a ramp inside to direct airflow and picked up 6mph.
__________________
Lance Logan
McAlpin, FL
Plane at FL10
Scratchbuilt Biplane
Preceptor N3 - Sold
Zenith Zodiac 601HD - Sold (good riddance)
Kitfox IV - Sold my share, but loved that plane
RV8A Sold! Loved the plane, but not the nosewheel!
RVX (RV6/4) Sold
Cherokee 180 pickup truck
RV8 Fastback
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12-20-2015, 11:19 AM
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Senior Curmudgeon
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Join Date: Sep 2005
Location: Dayton Airpark, NV A34
Posts: 15,420
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Quote:
Originally Posted by judoka5051
The cooling exit fairing was copied from the ones seen on this forum, but made in 3 pieces. That made it a lot easier to form it. While on the subject of exit fairings,,, I made one for the RV6 I bought and a ramp inside to direct airflow and picked up 6mph.
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Photos please..
__________________
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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12-20-2015, 11:23 AM
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Join Date: Jun 2005
Location: SoCal
Posts: 2,452
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What are the aileron fences doing (in theory)?
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Axel
RV-4 fastback thread and Pics
VAF 2020 paid VAF 704
The information that I post is just that; information and my own personal experiences. You need to weight out the pros and cons and make up your own mind/decisions. The pictures posted may not show the final stage or configuration. Build at your own risk.
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12-20-2015, 11:46 AM
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Join Date: Dec 2012
Location: Brooksville, MS
Posts: 745
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Keep it up! Good work there.
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Weasel
RV-4 715hr Sold 
RV-10 "School Bus" -   +1600hr counting
Fisher Classic Cassler Power VW sold
RV-10 N7631T 820hr Sold
RV-8 700+hrs
Carbon Cub 200 hr Sold
One-Off Super Cub 100 hr
SERFI AWARDS
http://weaselrv10.blogspot.com/
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12-21-2015, 03:03 AM
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Join Date: Mar 2015
Location: Niort
Posts: 21
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Mods
Hello Hlangebro & Judoka5051
You look like "Van's mods" specialists.
Could you come back to us with much more details, photos and advices on mods you did on your plane already.
Two points are really interesting:
Cooling exit fairing. Hlangebfo, do you have chart of it (I fly RV6A with Weterman cross flow exhaust).
Flaps & ailerons -2 degres. Judoka, is there some effect on roll response. Is th ailerons are more sensitive?
Many thanks in advance
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Bernard
France
LFBN - Niort Marais Poitevin
RV6A - F-PGAK - o360 A1A - AFS 3500 - Flymap - Garmin avionics
2009 - 560 hours
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12-21-2015, 04:47 AM
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Join Date: Nov 2006
Location: Savannah, GA
Posts: 1,029
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Yes, more pictures please!
Also, I noticed in the aileron fence picture that you seem to have done something over the pushrod attachment...
__________________
RV-7ER - finishing kit and systems installation
There are two kinds of fool in the world. The first says "this is old, and therefore good"; the second says "this is new, and therefore better".
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12-21-2015, 09:03 AM
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Join Date: Jul 2015
Location: Granite Bay, Ca
Posts: 131
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Where did you get the antenna fairings? Or, did you form them yourself? Thanks, Bruce Estes
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12-21-2015, 06:01 PM
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Join Date: Aug 2010
Location: McAlpin, FL
Posts: 253
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Here's a couple of pics ("I hope" says the caveman) this is a little different than what I did on the RV8A. The 6 exhaust is angled much more sharply down, so no center piece. The ramp that guides the air out of the cowl is likely as responsible as the 'flow straightener', but I'm too lazy to take the cowl of just to get a pic. Sorry about the dirty bottom... been doing a little acro.
[IMG]  [/IMG]
__________________
Lance Logan
McAlpin, FL
Plane at FL10
Scratchbuilt Biplane
Preceptor N3 - Sold
Zenith Zodiac 601HD - Sold (good riddance)
Kitfox IV - Sold my share, but loved that plane
RV8A Sold! Loved the plane, but not the nosewheel!
RVX (RV6/4) Sold
Cherokee 180 pickup truck
RV8 Fastback
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12-21-2015, 06:03 PM
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Join Date: Aug 2010
Location: McAlpin, FL
Posts: 253
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The other pic that I thought I posted...

__________________
Lance Logan
McAlpin, FL
Plane at FL10
Scratchbuilt Biplane
Preceptor N3 - Sold
Zenith Zodiac 601HD - Sold (good riddance)
Kitfox IV - Sold my share, but loved that plane
RV8A Sold! Loved the plane, but not the nosewheel!
RVX (RV6/4) Sold
Cherokee 180 pickup truck
RV8 Fastback
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