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woxofswa
Joined: 12 Aug 2008
Posts: 349
Location: AZ
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 Posted: Wed Sep 15, 2010 11:28 am Post subject: lower cowl attach alternatives |
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I've learned from reading that there seems to be agreement that the piano hinge isn't strong enough for the two 6 inch attach points at the bottom of the cowl.
What is the generally accepted alternative? Screws/nutplates? Camlocks? Is there such a thing as stronger hinge, perhaps stainless? Any advice or pix appreciated.
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Myron Nelson
Mesa, AZ
Flew May 10 2014 |
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dave.saylor.aircrafters(a
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| Posted: Wed Sep 15, 2010 12:39 pm Post subject: lower cowl attach alternatives |
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My hinges failed after about 100 hours. I installed extensions with 3 nutplates on each of the existing lower flanges. I used the original holes from the hinge rivets.
After about 500 hours the plane developed a small crack in the lower skin immediately aft of the extensions. We were able to get a doubler between the firewall and the skin, and rivet it in place with blind rivets. We couldn't get to the back of the skin without removing the pilot's floor board (grimace here) or at least installing a nasty access panel.
At the same time, I replaced the flange extension with a 90 degree bracket that also puts a few rivets "tail aft" into the firewall, under the floor, to beef that up as well.
All this is on the left side. So far the right side looks OK.
I check on the cracked area regularly and it seems to be stable now (200 hours).
Early on, I also fabbed a new attach tab for the center of the outlet. The original failed and was replaced by 2X the original thickness. That's been working fine for quite a while.
Dave Saylor
AirCrafters
140 Aviation Way
Watsonville, CA 95076
831-722-9141 Shop
831-750-0284 Cell
On Wed, Sep 15, 2010 at 12:28 PM, woxofswa <woxof(at)aol.com (woxof(at)aol.com)> wrote:
| Quote: | --> RV10-List message posted by: "woxofswa" <woxof(at)aol.com (woxof(at)aol.com)>
I've learned from reading that there seems to be agreement that the piano hinge isn't strong enough for the two 6 inch attach points at the bottom of the cowl.
What is the generally accepted alternative? Screws/nutplates? Camlocks? Is there such a thing as stronger hinge, perhaps stainless? Any advice or pix appreciated.
--------
Myron Nelson
Mesa, AZ
Emp completed, QB wings completed, legacy build fuse in progress
Read this topic online here:
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Strasnuts
Joined: 10 Feb 2009
Posts: 502
Location: Salt Lake City, UT
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| Posted: Wed Sep 15, 2010 4:53 pm Post subject: Re: lower cowl attach alternatives |
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Here is what I did. I replaced the rivets with AN426-4-5 rivets instead of the An426-3's that were there initially.
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RV-10 SB N801VR Flying
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