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Converting Piano Hinge Cowl to Fastener?
Hi,
Has anyone done this? Did a search and couldn't find anything. Thanks, D |
I did
I replaced my top piano hinge only on my RV4. Came out like hammered dog poop. My plane is painted, thought I could do it without screwing up the paint HAHA. The gap between the metal and cowl is huge, just couldn't get it right.
It REALLY wasn't worth the hassle. When done from the start its a different story. If I was building a new rv, I'd stick with piano hinge all around, yes they do break, but just is easier for me. I would try using or looking into the extruded hinge I think the number is MS20001P. Good luck! |
Skybolt
Hi
I put Skybolt fasteners in my cowl top where it meets the firewall. Done properly it looks great. I kept the hinges to joint top to bottom and the bottom cowl to the firewall. They work well there. |
yes
I have converted 2 RV-6's from standard Van cowls with piano hinges to James Cowls with ALL Mil-Spec 1/4 turn fastners. I like it.
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Retro-Fitting Hinge to Skybolt Fasteners
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I look forward to feedback, Ned Bowers, Skybolt - Oshkosh July 24 thru 26th |
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What I did actually was fabricate a strip of aluminum with the tabs shaped and properly spaced, then inserted the strip into the airframe. This has been done many times by many builders. The key is to NOT drill the holes in either the fiberglass or the tab until one has final alignment. Then a well placed small hole will make the center of the larger hole. In the case of the Skybolt tabs, if you could sell undrilled versions, so builders could drill their own holes instead of trying to finding the existing holes under a painted cowl might help. Just my .02.... |
It appears the airplane is new to you. Properly done, piano hinges work great. I will assume the builder on yours didn't do it right and you want to change as a result of it not working well on your airplane. If that is the case,
describe your issues. Things like hinge alignment, difficult removal, etc... can and have been fixed. Sometimes the fix is pretty easy, sometimes impossible. If I was going to change, short of a new cowling, I would remove the hinge eyes and not mess with trying to remove the entire hinge. You could then fabricate the tabs. It will take some careful thought and probably some shimming. The hinge isn't very wide. |
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undrilled versions would be huge help. |
Skybolts
I just finished installing Skybolt 1/4 turn fasteners on my '93 RV6A that I have owned for 2 years.
Shortly after getting the plane home, I decided on a GRT panel with the existing vacuum system for back up and a back up battery for the efis. After finishing the panel, I discovered it was almost impossible to get the piano hinge pins installed across the top of the firewall. I had mounted the oil and fuel press senders in the spot my hand used to fit in while installing them. I was thinking about Skybolt anyhow so that made up my mind. I removed the top of firewall and side horizontal piano hinges and kept the firewall side hinges. This allowed me to install the cowlings back in their exact locations using the side vertical hinges and clamping the front exactly even together. I then was able to accurately mark the holes to drill to mount the studs, then paint the cowling. The worst problem I had was the original builder recorded the paint name and color number so I could match it, BUT.....The color gray he recorded as the exterior gray was actually the interior gray so now I have a light gray stripe on the cowling matched to a medium gray stripe down the fuselage. Hopefully I will get the right gray this week. Love the Skybolts. |
Skybolt Vans RV Hole Finder
Skybolt introduces yet another innovation to make installing fasteners easier and more efficient ?
SK-RVC114 (14 sets) and SK-RVC119 (19 sets) Hole Finders. As we begin to see more and more conversions from hinge to fasteners, including builders removing previously installed hinge and installing the Skybolt fastening system, hole finding becomes a challenge. Typically, on the initial build, we have relied on the cowling skins being transparent (to some extent) in order to drill the initial pilot holes at center. With the new push to retrofit existing aircraft, we can no longer rely on transparency because of paint. By modifying our current Cleko inserts to be used with the Skybolt SK-RVFS1 Interlocking Flanges to accept a magnet, we can locate the center hole quite accurately in all cowling skins with a small dowel pin. Our kits include a limited number of the inserts to satisfy the Cleko requirement. (This is the equivalent of a flange without the hole as stated in a previous post). The complete sets adding a magnet and dowel pin however, answer the issues with painted (opaque) cowling retrofits. Per our installation instructions where we describe the SK-RVC1 Inserts as a method to Cleko the cowling to the flanges before the receptacles are installed, obviously for this to work, you have to drill a 1/8 inch hole in the cowling. Using the inserts in the same manner, tape the inserts with the magnet installed into the back of each flange. Set the upper or lower cowling into position with a ratchet strap, then drop the dowel pin in the general vicinity of each flange center hole. Drop it a few times to insure the pin centers at the exact same spot. Drill a 1/8 inch pilot hole. Insert a Cleko (the magnet will push away from the insert) and proceed to the next location. SK-RVC114 Sets (14) are $33.46 (Fasteners not included) for RV4 and RV8 SK-RVC119 Sets (19) are $45.41 (Fasteners not included) for RV6 thru 10 Order On-Line at www.skybolt.com or call us, 800-223-1963. I'll post some photos and a drawing soon. See you at Oshkosh, Ned |
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