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  #11  
Old 07-01-2014, 08:42 AM
David Paule David Paule is offline
 
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Location: Boulder, CO
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It might be worth having a cockpit air outlet, a designed-for-the-task air exit from the cockpit. It's got to go somewhere and if it's not going where it should it's making drag.

Dave
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  #12  
Old 07-01-2014, 09:36 AM
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rvator51 rvator51 is offline
 
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Thanks Dave,
I agree with you. In reading previous threads, it seems some locations work for some and dont work for others. Must be a lot of variables and I dont want to cut another hole in RV until I know for sure it is a good location for air outlet.
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  #13  
Old 07-01-2014, 10:23 AM
Michael Henning Michael Henning is offline
 
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Bob,
Does the eyeball hit your leg at all? I put two RV-10 vents on the -4.
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  #14  
Old 07-01-2014, 10:25 AM
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olyolson olyolson is offline
 
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Default RV-4 Vents

Don't know if it's pertinent to the issue or not but I have a Sam James Cowl so perhaps there is a different airflow pattern around my cockpit. I am getting lots of air through both NACA vents but it just goes right down the side of the canopy to the back. The back seaters say there's good flow back there. I am going to steal the air and just deflect it towards me.

A couple RV-4 guys around here have the CA LV-3 Vent that Vans Acft sells. I have been in the back seat of both and they work great and you can aim the flow. I have two NACA vents in the front & one on the right side in the back. I am going to install one of these CA LV-3 vents in the back on the left side. They are made of aluminum and can be painted to match the airplane. Picture below:



Oly
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Last edited by olyolson : 07-01-2014 at 10:27 AM.
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  #15  
Old 07-01-2014, 10:42 AM
Michael Henning Michael Henning is offline
 
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I have two RV-10 vents under the cheeks, and two of the vetterman vents for back seater.
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  #16  
Old 07-01-2014, 04:03 PM
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smokyray smokyray is offline
 
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Location: TX32
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Default Venting...

Quote:
Originally Posted by rvator51 View Post
In my never ending quest to get the cockpit cooler (not to mention CHTs but thats another story), I made and temporary stuck a set in front of each naca vent on the rv-4 canopy. The vents are in the location called out for in the plans. However, air flows out of the front vent instead of in and the rear vent doesnt have a large volume of air flow. Hopefully these will help reverse that. If they dont work, I will make different ones that have a lot more acute angle on them. Has anyone did this with success?
Tom,
My 89' RV4 plans had several poor ideas that (like leisure suits) seemed good at the time, tank sloshing and canopy rail Naca vents. I quickly found on my test flight in my home states 90/90 conditions that they fell well short of claims. I tried the VG"s and they slightly improved the forward vent air. I also tried wing root fairing holes similar to Cessnas, which worked OK.
The fix came when I purchased a beta test version of Larry Vetterman"s vents pictured by Oly above long before he sold them to vendors including Van"s. I installed them on the left side of the fuselage 6" below the canopy rail front and rear cockpit per an Aero Engineers suggestion and a third on right fwd. Problem solved partly.

The bigger fix was to drill holes around my rear seat bulkhead and turn my aft fuselage into a Venturi, drawing a noticeably large amount of air through. I added many to friends RV4"s over the years. For vents now I suggest the underside right wing NACA duct ala RV8 for rear cockpit and RV10 flip out vents on the fwd fuselage below the aft cowl bumps. Both are invisible on the ground (if closed) but work amazingly well when open.

Redneck A/C at it"s finest...

V/R
Smokey

Last edited by smokyray : 07-01-2014 at 04:18 PM.
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  #17  
Old 07-01-2014, 11:12 PM
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rvator51 rvator51 is offline
 
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Hi Smoky,

Thanks for all of your accumulated wisdom! I have been hearing that the tail is a high pressure area and opening a vent in the baggage area to it would let in high pressure air. Are you saying its a low pressure area and cockpit air will vent to the tail if you open holes in the aft baggage bulkhead?
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  #18  
Old 07-02-2014, 09:58 AM
Tomcat RV4 Tomcat RV4 is offline
 
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Location: Jacksonville,Fl. 32246
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Default vortex generators for Naca vents

Has anyone used something like vents on rv10, I am considering in side of fuselage on -4 under construction ? Tom
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  #19  
Old 07-03-2014, 09:15 PM
RV-4 RV-4 is offline
 
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Location: St-Jerome,Quebec,Canada
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Thumbs up RV-4 VENTS

All

I have one of these (CA LV-3 vents ) on the right rear skirt of my RV-4 and it does really work and looks good.I also have 2 Naca ducts about 6 '' under each cheeks and there is so much air going thru them that they set the squelch off my radio...

I also have a small flap on the left fwd side skirt which I rarely use these days even with temps in the 90s like last week..

So there are ways to cool an RV-4

I'll try to take pictures tomorrow.

Bruno
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  #20  
Old 10-11-2014, 02:05 PM
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shadowbrush shadowbrush is offline
 
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Quote:
Originally Posted by rvator51 View Post
Heres a picture of the first trial set:

Where can one get NACA vents that close like these?

Thanks,

Holger
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