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  #1  
Old 11-14-2005, 11:25 AM
13brv3's Avatar
13brv3 13brv3 is offline
 
Join Date: Nov 2005
Location: Tellico Plains, TN
Posts: 561
Default plenum kit?

Greetings,

I've noticed that some folks are using plenums on their engines now, rather than the traditional baffles that seal to the top canopy. Does anyone make a pre-made plenum for the RV-8, with a stock cowl? I know Sam James makes one, but I think it's only for their cowl.

Thanks,
Rusty (emp kit just arrived, QB coming in Jan)
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  #2  
Old 11-14-2005, 12:07 PM
N62XS N62XS is offline
 
Join Date: Jan 2005
Location: Hazlehurst, GA
Posts: 1,386
Default Plenum Options

Jon Johannsen makes one, but most of the web sites I've seen use Vans baffling and put a top on it. ?he guys at Showplanes.com are said to be close to a better version of the James Holy Cowl, but I've yet to see it.

On my next 8, I plan to mold my plenum out of foam and lay it up with glass and vinyl ester resin.

Robby
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  #3  
Old 11-14-2005, 02:33 PM
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gmcjetpilot gmcjetpilot is offline
 
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Posts: 4,310
Default Make your own

The JJ unit is too much money ($800?). You can make your own from aluminum off of Vans basic baffle kit. You can also use Vans baffle kit and make a fiberglass cover. Robby suggest vinyl ester resin. I am not a Fiberglass guy but (I THINK?) the Vinyl ester stuff shrinks and is not good with heat. I think epoxy resin is better? Check it out first. Look at builder sites for ideas. G

http://home.mindspring.com/~rv6/RV6site/index.htm
http://rv8a.tripod.com/engine.html
The following is for Rockets, but you get an idea
http://www.vincesrocket.com/Engine%20and%20Prop.htm

Last edited by gmcjetpilot : 11-14-2005 at 04:23 PM.
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  #4  
Old 11-14-2005, 04:06 PM
N62XS N62XS is offline
 
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Default Vinyl Ester

G:

The reason I mentioned Vinyl Ester is because James' plenum is manufactured using that material. To me it is all nasty stuff.

Robby
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  #5  
Old 11-14-2005, 06:40 PM
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13brv3 13brv3 is offline
 
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Location: Tellico Plains, TN
Posts: 561
Default

Thanks for the info, particularly the links to custom plenums. I've seen at least one of those in searches through the archives, but it's clear there's most than one way to do this. Unfortunately, my hope was that someone would have a reasonably priced plenum available, or at least plans to modify the Van's baffle kit.

On my first RV-8, I spent almost a whole vacation week working on nothing but baffles. I just couldn't believe how long it took, but they came out fine, and worked fine. I do think there are advantages to putting a lid on the baffles, rather than trying to seal it to the cowl, but I'm not sure "time to build" is going to be one of those advantages unless someone sells one ready made

I'll take a look when I get to that point, and decide if it seems easier to make them stock, or put a lid on it.

Thanks,
Rusty
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  #6  
Old 11-14-2005, 08:00 PM
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Kevin Horton Kevin Horton is offline
 
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Location: Ottawa, Canada
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Default

Quote:
Originally Posted by gmcjetpilot
Look at builder sites for ideas.
Thanks for the links. Has anyone come up with a decent way to seal the cowl inlets to the plenum, assuming you are using the standard Van's inlet shape? I'd love to see some pictures of that. That's the one thing that still baffles me about making a plenum.
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  #7  
Old 11-15-2005, 12:57 AM
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sprucemoose sprucemoose is offline
 
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Location: MKE
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Default

Quote:
Originally Posted by Kevin Horton
Has anyone come up with a decent way to seal the cowl inlets to the plenum, assuming you are using the standard Van's inlet shape?
If you just need a decent (not perfect way) do what I did- use airseal fabric riveted to the top cowl to seal the top of the plenum, in the same way that the bottom cowl is sealed to the standard baffles. It's not as tight as, say, a Sam James, but it works, as you say, decently.

http://home.mindspring.com/~rv6/RV6site/plenum.htm
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  #8  
Old 11-15-2005, 04:31 AM
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pmercier pmercier is offline
 
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Location: Abbotsford BC. Canada
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Default Custom Plenum

I plan on fabricating my own plenum using epoxy resin. I'm also going to use the inlet rings from Sam James to reduce the cooling drag. The plenum will be screwed to the standard vans baffle kit.

Philip Mercier, RV-4
Abbostford BC.
http://members.toast.net/pmercier/project2/index.html
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  #9  
Old 11-15-2005, 07:15 AM
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f1rocket f1rocket is offline
 
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Location: Martinsville, IN
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Default

Quote:
Originally Posted by Kevin Horton
Thanks for the links. Has anyone come up with a decent way to seal the cowl inlets to the plenum, assuming you are using the standard Van's inlet shape? I'd love to see some pictures of that. That's the one thing that still baffles me about making a plenum.
Here's how I did mine on my Rocket.

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  #10  
Old 11-30-2011, 02:24 AM
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Janekom Janekom is offline
 
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Default Have you seen this?

Have you seen this?
http://rvbits.mybigcommerce.com/prod...er-Plenum.html
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