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  #11  
Old 12-21-2015, 06:22 PM
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grubbat grubbat is offline
 
Join Date: May 2012
Location: Ga
Posts: 662
Default RVX

Lance,
Did you buy the RVX?
Cj
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  #12  
Old 12-21-2015, 06:27 PM
judoka5051 judoka5051 is offline
 
Join Date: Aug 2010
Location: McAlpin, FL
Posts: 253
Default RVX

Yes I did.
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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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  #13  
Old 12-21-2015, 10:04 PM
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hlangebro hlangebro is offline
 
Join Date: Mar 2012
Location: San Diego, CA
Posts: 133
Default Answers

Hi guys,
I will get back with some answers. I am on vacation until the 27th
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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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  #14  
Old 12-22-2015, 04:21 PM
Stroh21 Stroh21 is offline
 
Join Date: Nov 2014
Location: Clovis, NM
Posts: 139
Default

Silly Question,

You mention you broke 200mph, but the pictures indicate 140-150kias at 7500ft. Is your reference of 200mph the ground speed?

I mostly ask because I normally see 145-155mph indicated airspeed when I'm flying at 11,500ft with a 200mph ground speed and clam winds. I just want to see how my 8 is performing compared to everyone else.
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RV-8A Owner
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  #15  
Old 12-22-2015, 09:52 PM
cajunwings cajunwings is offline
 
Join Date: Jun 2007
Location: new iberia la
Posts: 768
Default Mods

[quote=judoka5051;1039195]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.


Lance: I'm very interested in the exit ramp, please post a pic when convenient. Don
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  #16  
Old 12-23-2015, 12:04 AM
eddieseve eddieseve is offline
 
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 617
Default

Hey Lance

What performance improvement did you notice with the exit fairing extension?

Cheers
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Eddie Seve
Sydney Australia
First Flight 16th July 2012
RV-7 Phase 2, 30 Oct 2012
1100 hrs Feb 2020
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  #17  
Old 12-23-2015, 07:21 AM
judoka5051 judoka5051 is offline
 
Join Date: Aug 2010
Location: McAlpin, FL
Posts: 253
Default Picked up 6mph!

I did a before and after within an hour, at the same altitude. So, while not 'scientific' it's close. The plane didn't have anything to direct the airflow out of the cowl (unlike the 8). Just the firewall and a sharp 90 degree turn at the bottom. So I added a ramp that is riveted to the top of the cooling exit and curves up to connect to the lower engine mount tubes. I've read many times in different place that it is important to get the exit air 'headed in the right direction' which makes sense. I added the exit fences at the same time, so I don't know which of the changes made the most difference, but I expect it's a synergistic effect.
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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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  #18  
Old 12-23-2015, 07:38 AM
krw5927 krw5927 is offline
 
Join Date: Aug 2010
Location: Wichita, KS
Posts: 1,958
Default

Quote:
Originally Posted by cajunwings View Post
Lance: I'm very interested in the exit ramp, please post a pic when convenient.
Me too! Thanks!
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Kurt W.
RV9A
FLYING!!!
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  #19  
Old 12-23-2015, 08:24 AM
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smokyray smokyray is offline
 
Join Date: Jan 2005
Location: TX32
Posts: 1,891
Default Sweet!

Quote:
Originally Posted by judoka5051 View Post
The other pic that I thought I posted...

The innovation continues....
Nicely done LL...

V/R
Smokey

PS:Glad you're enjoying it!
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  #20  
Old 12-25-2015, 10:53 AM
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Barbeau Barbeau is offline
 
Join Date: Mar 2015
Location: Niort
Posts: 21
Default

Quote:
Originally Posted by judoka5051 View Post
I did a before and after within an hour, at the same altitude. So, while not 'scientific' it's close. The plane didn't have anything to direct the airflow out of the cowl (unlike the 8). Just the firewall and a sharp 90 degree turn at the bottom. So I added a ramp that is riveted to the top of the cooling exit and curves up to connect to the lower engine mount tubes. I've read many times in different place that it is important to get the exit air 'headed in the right direction' which makes sense. I added the exit fences at the same time, so I don't know which of the changes made the most difference, but I expect it's a synergistic effect.
Hello
As my English is not so fluent, I'd like to clearly understand what you did speaking about the "ramp". Could you send us a drawing (very simple).
About fences it's clear, but do you thing it could be better to close the bottom between the two fences, and to have two straight exhaust pipe blowing horizontally.
Have a nice Christmas
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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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