2thman(at)cablespeed.com
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 Posted: Mon Feb 18, 2008 8:27 am Post subject: Cowl hinges for my RV-4 |
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Hello Dean,
Thanks for your inquiry about Carbinge products. I have attached a couple of photos that I hope will make some of the concepts a little more clear. Please see answers to your questions and some commentary below:
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From: Dean Pichon [mailto:deanpichon(at)msn.com]
I am in the middle of converting the cowl attachment on my RV-4 from (aluminum) panio hinges to Skybolt fasteners and am considering making a mid-stream change to your hinges. I would like to clarify a couple of issues with you.
I installed rolled hinges in my -4 furing initial construction. I have broken a number of eyelets both the curved hinge section along the upper firewall and the horizontal section joining the upper and lower cowl halves. I have installed Skybolt fasteners along the firewall. I have the following questions:
<![if !supportLists]>1. <![endif]> To improve asthetics and reduce cowl wear, I install my hinge pins from inside the cockpit of the -4. The pins are inserted through holes in the fuselage skin behind the cowl cheeks. The pins go through holes in the flanges of the cheek pieces and enter the hinge strips from the aft section of the cowling. For this most part, this has worked well, except there seems to be some relative motion between the cheeks and the cowl. The eyelets that have broken are on the most aft section of hinge and the holes in the cheek flanges have become elongated. If I use hinges again, I will consider attaching a bushing of some sort to the cheek flange to better support the pin. Are you are of any -4's that use your hinges and insert the pins from the cockpit? Can you supply longer hinge pins (about 6') to support this installation?
Answer:
I don’t know of RV-4’s with this config, but there was a builder assist shop in San Jose that just closed last month. They were doing this with Lancair Legacy’s. I supplied the Carbinge but not supply the pins because there was not a large enough demand to warrant stocking the material and frankly I couldn’t see the purpose. Pins were 6 foot long for that a/c too.
I understand your desire to make the result esthetic and that is one of our prime goals with Carbinge. That is where the Carbinge Keepers come in. With this product you have a drop dead simple method of removal and replacement and you have only one small hole at the point of each pin placement. The hole is about 3/16” in diameter and the head of the allen screw can pretty much sit flush with this hole. (see photo of Keeper installed in a wing tip)
- Can you recommend alternate techniques for attaching the cowl sections to the cheek pieces? In typical RV installations, does the hinge pin terminate in the hinge or does in continue into a hole in the aircraft?
Answer:
Unfortunately I don’t know what “cheek pieces” are. If you refer to the bend in the cowl as it approaches the propeller, Carbinge is ideal for this. You simply bond the hinge to the cowl stopping its forward extent wherever you wish without making the radius too small. You can play with this at installation and get a feel by hand fitting the hinge to the cowl part.
<![if !supportLists]>3. <![endif]>Your website lists only 4' sections. Do you offer hinges in 3' or 6' lengths?
Answer:
We do not. We used to sell smaller pieces, but found this just drives up the cost for everyone so we just sell the 4’ lengths. Should the market present the demand for longer pieces we could meet that need. Currently for applications using a longer hinge, we recommend using a four foot piece and aligning a smaller one to get the length needed. As long as you insert a pin to align the two pieces at installation this works fine.
- Are the hinges in-stock?
Answer:
Yes.
Comment:
I do not think extruded aluminum hinges are a good or adequate solution for any joining of composite materials in airplanes for all the reasons I have stated on the RV-List. However, they are far superior to any kind of rolled hinge that I know of.
Hope this helps.
John Barrett
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