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Old 09-29-2018, 04:50 AM
plehrke's Avatar
plehrke plehrke is offline
Join Date: Sep 2006
Location: Defiance, MO
Posts: 1,475

I have never had any issues with the hinge pin along the side holding top and bottom together. That is the pin the Original post, I believe, is asking about. Very straight pin lubed with a little LPS every time will slide right in. Same for pin that goes down side of lower cowl.
I have #10 stainless steal countersunk screws with tinnerman washers at 2 to 2.5” spacing across entire upper aft edge of upper cowl. Takes about 5 minutes to remover install with battery screw driver. Not as clean looking as the piano hinge but never issue with install/remove.
RV-6A - 13 years over 900 hours
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Old 09-29-2018, 05:36 AM
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humptybump humptybump is offline
Join Date: Feb 2011
Location: Eastern Shore of Virginia
Posts: 3,139

Like Phillip, my RV-8 cowl uses hinge pins along the horizontal seam between the top and bottom halves. The builder of my RV-8 used F4U plate fasteners along the aft top curve.
- Glen, ESVA
RV-8 FP IFR | Track my RV-8 | 53VG
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Old 09-29-2018, 11:22 AM
Robert Anglin Robert Anglin is offline
Join Date: Mar 2008
Location: houston, texas
Posts: 900
Default Zipper.

We use the hinge pins, per the plans. It is had to beat a Zipper for closure and strength. We have also seen a lot of Cam-Locks used. It is what you want and like the looks of. Yours, R.E.A. III # 80888
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Old 10-01-2018, 06:41 AM
Capt Capt is offline
Join Date: Feb 2017
Location: Australia
Posts: 398

I have the std piano hinge arrangement on my 8, screws and nut plans under the lower cowl near the exhaust, they are out of sight. As much as I don't enjoy using the hinge style to remove/fit the cowl I love the clean look, I really dislike a whole row of screws around the cowl, personal choice I guess
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Old 10-01-2018, 08:06 AM
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Veetail88 Veetail88 is offline
Join Date: Oct 2008
Location: Hales Corners, WI
Posts: 942

I used the piano hinges on the sides and all of lower cowling. HATED THEM! I've switched to Sky Bolts and will never go back!
Jesse Bentley
N229Z - RV-8 - Flying - Livin' the dream!
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Old 10-01-2018, 10:25 AM
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JonJay JonJay is offline
Join Date: Jan 2007
Location: Battleground
Posts: 4,192

Discussed many, many times.... Done correctly, the hinge pins work great and are by far the easiest to de-cowl and cowl back up. I have both and prefer the pins but I wouldn't kick the quick turns out of bed for eating crackers.
However, done incorrectly, the pins can be a real pain in the you know what.

As far as looks, I like the per plans look, but to each his own. I am not about to change out the quick turns, nor am I about to switch my pins, same...

I also have a slider which is the only way an RV should be built and as far as primer is concerned.....
Smart People do Stupid things all the time. I know, I've seen me do'em.

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Bucker Jungmann
Fiat G.46 -(restoration in progress, if I have enough life left in me)
RV1 - Proud Pilot.
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Old 10-01-2018, 02:11 PM
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chrispratt chrispratt is offline
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Join Date: Oct 2005
Posts: 692

Originally Posted by Carl Froehlich View Post
I note however that the lower cowl hinge should be replaced with the more robust extruded hinge (MS20001) or aluminum plates with nutplates.

I used .032 aluminum with nutplates (3 per side) for the lower cowl on my RV-8. After 13 years (765 hours) the aluminum cracked near the inboard nutplate on both sides. I think this is a good solution as compared to the plans (hinge material) but suggest using a minimum of .040 aluminum if you are going to use this approach.

Chris Pratt (2019 VAF DUES PAID)
RV-8 Flying, 800+hours
Lycoming O-360-A1A, Hartzell CS
52F (Northwest Regional, TX)
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