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05-22-2011, 10:37 AM
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Join Date: Apr 2008
Location: Indianapolis, IN
Posts: 1,069
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fabing my Plenum
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Ryan Allen, CFII
RV7 N612RA, flying since july 2012
E-170/175
RV10 Tail Kit complete, Wings 90%, fuse on order
Acro Sport 2, building
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05-22-2011, 10:40 AM
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Join Date: Jan 2005
Location: SC
Posts: 12,887
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Looks great!
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Bill R.
RV-9 (Yes, it's a dragon tail)
O-360 w/ dual P-mags
Build the plane you want, not the plane others want you to build!
SC86 - Easley, SC
www.repucci.com/bill/baf.html
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05-23-2011, 01:38 PM
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Join Date: Apr 2008
Location: Indianapolis, IN
Posts: 1,069
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thanks Bill..
I little more progress here. Cleaned up the edges and fitted it to the baffle...mostly.. Still some work to do on the left side rear, there is a gap and I have not decided how I am going to handle this yet. Also, I need to rework the inlets and widen them about an inch.. Haven't decided the best plan of action there either yet.
Left side rear gap.
I am thinking possibly to cut on the line here and move the outer piece where I need it and then lay glass over the gap.. ??

__________________
Ryan Allen, CFII
RV7 N612RA, flying since july 2012
E-170/175
RV10 Tail Kit complete, Wings 90%, fuse on order
Acro Sport 2, building
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05-23-2011, 01:51 PM
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Join Date: Jul 2007
Location: Molalla, Oregon
Posts: 955
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Ryan,
I'm very interested in following your methods and progress on this project. Please keep the details coming! Do you have a website or more pics somewhere online?
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05-23-2011, 02:09 PM
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Join Date: Jan 2008
Location: Ashland, OR
Posts: 2,574
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just scarf the edges and lay on more glass
Your idea for the inlet widening is fine. Just grind the edges down to a thin edge, creating a tapered lap joint with the new glass.
Same thing for the gap in the back. You can tape a piece of cereal-box cardboard inside to form the shape a little bit, cover it with packing tape, and build up glass over it to extend the edge of the plenum out to where you need it. Again, just grind a scarf angle on the original glass to bond to.
The tricky part is going to be making the rubber boots to seal the plenum to the cowl intakes. Dan Horton has made some interesting reinforced rubber parts, you might check out his postings
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Steve Smith
Aeronautical Engineer
RV-8 N825RV
IO-360 A1A
WW 200RV
"The Magic Carpet"
Hobbs 625
LS6-15/18W sailplane SOLD
bought my old LS6-A back!! 
VAF donation Jan 2020
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05-24-2011, 03:26 PM
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Join Date: Jan 2006
Location: Belgium
Posts: 645
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Benefit??
Hello,
Can anybody explain to me what the benefit of this is?? To me it looks a lot more work, more weight and less access to the top of the engine than the standard setup with rubber baffle seals against the inside of the cowling.
Regards, Tonny.
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"Pilottonny"
Tonny Tromp
Lanaken, Belgium (EU)
RV9A, Registration: PH-VAN
ECI-Titan IOX-320 with dual EI, turning a Whirlwind 200RV CS prop.
Sold
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05-24-2011, 03:56 PM
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Join Date: Oct 2005
Location: 08A
Posts: 9,500
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Quote:
Originally Posted by Pilottonny
Can anybody explain to me what the benefit of this is??
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The elimination of leakage, which has a host of benefits.
Quote:
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To me it looks a lot more work, more weight and less access to the top of the engine than the standard setup with rubber baffle seals against the inside of the cowling.
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All true......there's no free lunch.
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Dan Horton
RV-8 SS
Barrett IO-390
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05-24-2011, 04:08 PM
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Join Date: Mar 2006
Location: SoCal
Posts: 626
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Very cool
Love using the top as the mold! I am one step behind and now rethinking the project to mold my top the same way.
Great work!
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JD
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RV-7 N314SY (KWHP)
IO-360-B1B
CANbus based trim/flaps and electrical
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05-24-2011, 04:23 PM
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Join Date: Jul 2005
Location: Detroit, MI
Posts: 1,587
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A further question
I think I understand the purpose. I have a SJ plenum under my SJ cowl. However, if I understand both the principles and the design of the SJ version, there is more to it than just reducing leakage.
As I understand it, as the air enters the volume above the cylinders, it is expanded because of the difference in intake area versus volume, taking into account speed. The speed is thus reduced. As I understand that, reducing the speed increases the pressure. The increased pressure is supposed to aid in the transfer of heat from the aluminum to the air. And so on.
In addition, the SJ version is gradually greater in volume toward the rear, an apparent technique for managing cooling rates of the individual cylinders. On mine, it seems to work quite well.
So my question is whether or to what degree that whole subject was applied to this design. To my unpracticed eye and taking the description of the use of the cowl and the mold, it was not. Lost opportunity?
__________________
H. Evan's RV-7A N17HH 240+ hours
"We can lift ourselves out of ignorance, we can find ourselves as creatures of excellence and intelligence and skill. We can be free! We can learn to fly!" -J.L. Seagull
Paid $25.00 "dues" net of PayPal cost for 2015, 2016, 2017 and 2018 (December).
This airplane is for sale: see website. my website
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05-24-2011, 04:30 PM
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Join Date: Oct 2008
Location: Utah
Posts: 8,151
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Quote:
Originally Posted by Pilottonny
Can anybody explain to me what the benefit of this is??
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... also locks all baffles preventing cracks in oil cooler corner by stiffening it
Looking good Ryan just watch that gap between the cowling and plenum by the prop.
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