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  #1  
Old 12-20-2015, 11:36 AM
hlangebro's Avatar
hlangebro hlangebro is offline
 
Join Date: Mar 2012
Location: San Diego, CA
Posts: 133
Default 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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H?kan Langebro
San Diego, CA

RV-7A, slider
Lycoming O-320 D1A, 160hp C/S
First flight 6-11-13

Re-engineering a Lancair 320..!


http://www.youtube.com/watch?v=AJuQ68tccTQ
http://www.mykitlog.com/hlangebro/
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  #2  
Old 12-20-2015, 12:14 PM
judoka5051 judoka5051 is offline
 
Join Date: Aug 2010
Location: McAlpin, FL
Posts: 262
Default 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.
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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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  #3  
Old 12-20-2015, 12:19 PM
Mike S's Avatar
Mike S Mike S is offline
Senior Curmudgeon
 
Join Date: Sep 2005
Location: Dayton Airpark, NV A34
Posts: 16,109
Default

Quote:
Originally Posted by judoka5051 View Post
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.
Photos please..
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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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  #4  
Old 12-20-2015, 12:23 PM
AX-O's Avatar
AX-O AX-O is offline
 
Join Date: Jun 2005
Location: SoCal
Posts: 2,545
Default

What are the aileron fences doing (in theory)?
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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 weigh 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. Further more, these are my opinions and not those of my employer.
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  #5  
Old 12-20-2015, 12:46 PM
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Weasel Weasel is offline
 
Join Date: Dec 2012
Location: Brooksville, MS
Posts: 750
Default

Keep it up! Good work there.
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RV-4 715hr Sold
RV-10 "School Bus" - +1700hr counting
RV-10 N7631T 820hr Sold
RV-8 700+hr
SERFI AWARDS

http://weaselrv10.blogspot.com/
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  #6  
Old 12-21-2015, 04:03 AM
Barbeau's Avatar
Barbeau Barbeau is offline
 
Join Date: Mar 2015
Location: Niort
Posts: 21
Default 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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  #7  
Old 12-21-2015, 05:47 AM
rmartingt's Avatar
rmartingt rmartingt is offline
 
Join Date: Nov 2006
Location: Savannah, GA
Posts: 1,133
Default

Yes, more pictures please!

Also, I noticed in the aileron fence picture that you seem to have done something over the pushrod attachment...
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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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  #8  
Old 12-21-2015, 10:03 AM
cardinalflier cardinalflier is offline
 
Join Date: Jul 2015
Location: Granite Bay, Ca
Posts: 133
Default

Where did you get the antenna fairings? Or, did you form them yourself? Thanks, Bruce Estes
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  #9  
Old 12-21-2015, 07:01 PM
judoka5051 judoka5051 is offline
 
Join Date: Aug 2010
Location: McAlpin, FL
Posts: 262
Default

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]
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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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  #10  
Old 12-21-2015, 07:03 PM
judoka5051 judoka5051 is offline
 
Join Date: Aug 2010
Location: McAlpin, FL
Posts: 262
Default

The other pic that I thought I posted...

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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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