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12-16-2008, 06:05 AM
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Join Date: Jan 2007
Location: St Mary's, Georgia
Posts: 135
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baffle seals
Here is one for the experts, Is it necessary to have a baffle seal where the air box meets the cowling? I have about a ? of clearance between the air box and the cowl. Why wouldn?t a bead of silicon at the junction of the two surfaces work, if a seal is needed? I?m going to put the baffle seal in the old fashion way but was curious about other alternatives.
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Dustman
RV3B
St Marys Georgia
Dues paid 11-11-2011
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12-16-2008, 06:38 AM
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VAF Moderator / Line Boy
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Join Date: Jan 2005
Location: Dayton, NV
Posts: 12,247
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There is a lot of relative motion between the airbox and the cowl - I think that you need the flexibility of baffle seals to let things move around.
Paul
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Paul F. Dye
Editor at Large - KITPLANES Magazine
RV-8 - N188PD - "Valkyrie"
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12-16-2008, 08:35 AM
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Join Date: Dec 2007
Location: Flagstaff, AZ
Posts: 2,647
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And you'll probably want more clearance or getting the cowling on and off is going to be a pain. I've got about 3/8" and am thinking of trimming the cowl a bit more.
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Patrick Kelley - Flagstaff, AZ
RV-6A N156PK - Flying too much to paint
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EAA Technical Counselor #5357
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12-16-2008, 09:28 AM
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Join Date: Jan 2007
Location: Battleground
Posts: 4,348
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Here is a trick to help...
Quote:
Originally Posted by flion
And you'll probably want more clearance or getting the cowling on and off is going to be a pain. I've got about 3/8" and am thinking of trimming the cowl a bit more.
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Mount your baffling material on the sides and bottom of the snoot only, wrapped around like a "U". Attach a straight piece to the Air Box to seal the top. This makes it much easier to put the Cowl on and off.
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Bucker Jungmann
Fiat G.46 -(restoration in progress, if I have enough life left in me)
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12-16-2008, 09:39 AM
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Join Date: Mar 2006
Location: Newport, TN
Posts: 7,496
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What is the best attachment method to get the material fastened to the snoot?
Quote:
Originally Posted by JonJay
Mount your baffling material on the sides and bottom of the snoot only, wrapped around like a "U". Attach a straight piece to the Air Box to seal the top. This makes it much easier to put the Cowl on and off.
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12-16-2008, 10:13 AM
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Join Date: Jan 2007
Location: Battleground
Posts: 4,348
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Varies....
Quote:
Originally Posted by Brantel
What is the best attachment method to get the material fastened to the snoot?
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I believe the plans call for large washers and pop rivets similar to the Engine Baffle and Cooling Ramp. I used screws with a nylon washer, large washers on the back side with locknuts. I used pop rivets on the Air Box piece.
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Smart People do Stupid things all the time. I know, I've seen me do'em.
RV6 - Builder/Flying
Bucker Jungmann
Fiat G.46 -(restoration in progress, if I have enough life left in me)
RV1 - Proud Pilot.
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12-16-2008, 11:04 AM
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Join Date: Mar 2006
Location: Newport, TN
Posts: 7,496
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Bolts and washers....Ok.
I doubt one could get a pop rivet gun in there so that must be the way to go....
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12-16-2008, 12:39 PM
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Join Date: Jan 2005
Location: SoCal
Posts: 2,061
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Quote:
Originally Posted by Brantel
I doubt one could get a pop rivet gun in there so that must be the way to go....
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FYI: the seals go on the airbox, not the cowl.
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Steve Zicree
Fullerton, Ca. w/beautiful 2.5 year old son 
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12-16-2008, 12:51 PM
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Join Date: Mar 2006
Location: Newport, TN
Posts: 7,496
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Not if you want to follow JonJay's advice.......
His idea is to have a U shaped piece on the cowl snout and a flat piece on the airbox top. When together they makeup the seal. This makes the cowl easy to lower down away from the airbox.
The plans and directions show the seal attached to the airbox but the smart people here at the VAF have deviated from the directions.
Last edited by Brantel : 12-16-2008 at 12:53 PM.
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12-16-2008, 01:10 PM
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Join Date: Oct 2005
Location: 08A
Posts: 9,477
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<<The plans and directions show the seal attached to the airbox but the smart people here at the VAF have deviated from the directions.>>
Assume pressure at the intake opening of the lower cowl is higher than pressure inside the lower cowl (and it probably is). Why install a flap seal backwards so it leaks under pressure (loss of manifold inches), and raises lower cowl pressure (bad for cooling) in the bargain?
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Dan Horton
RV-8 SS
Barrett IO-390
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