Cowl mounting?

Discussion in 'Firewall Forward & Fuel System' started by lanceav8r, May 14, 2018.

  1. May 14, 2018 #1

    lanceav8r

    lanceav8r

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    Has anyone here used piano hinge to mount their cowls like the Van’s aircraft crowd? If so what piano hinge did you use? Aircraft Spruce sells .050” thick aluminum extruded hinge with a stainless pin about .085 thick. I was expecting that something thicker like .063” would have been required but Spruce doesn’t seem to sell it.

    Is the .050” material thick enough?
     
  2. May 14, 2018 #2

    EAABipe40FF

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    Yes.
     
  3. May 14, 2018 #3

    TFF1

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    Too thick and it gets pretty hard to make it conform.
     
  4. May 14, 2018 #4

    smizo

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    we use the aircraft spruce piano hinge to join the two halves of the wolf cowl, or a carbinge if customers want to upgrade. still use traditional fasteners on the firewall.
     
  5. May 24, 2018 at 5:34 PM #5

    lanceav8r

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  6. May 25, 2018 at 12:28 AM #6

    bneub

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    I hadn’t seen the carbinge before. Those look cool. Do they work well?
     
  7. May 25, 2018 at 2:06 PM #7

    Neil

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    When we do a Glasair cowl we maintain the joggle so the joint looks nice and clean. Trim the joggle to about 1/2" tall and rivet the hinge with flush rivets. For a really nice finish on the outside, remove the jell coat before riveting and finish with a single layer of glass cloth over the rivet heads, then body work over the glass back to the level of the jell coat. This will prevent the rivet heads from "ghosting " through the paint as the aircraft ages.
    Use cam locks at the firewall. Scan.jpg
     
    Last edited: May 25, 2018 at 2:21 PM
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  8. May 25, 2018 at 3:00 PM #8

    Tralika

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    Look for the wire at a Hobby Shop. They will have a good selection and very inexpensive. You can try several different thickness wire for just a couple bucks. I used piano hinge to on my Highlander cowl to join the top and bottom, traditional fasteners to join the back of the cowl to the fuselage. Also, do you know of the technique using two different size hinge, a 1.5" and 2".
     

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  9. May 25, 2018 at 3:33 PM #9

    Neil

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    Just to add to Post #7;
    Most of the cowlings we get are really too thin in the seam area and we add a minimum of 3 layers of cloth about 1 1/2" wide where the hinges fit. Also we use the 3/4" rolled hinge. I believe the wire is about.070".
    When you add the laminates the cowling should be placed on the airplane while they cure, if possible.
     
  10. May 27, 2018 at 12:08 AM #10

    lanceav8r

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    I have another question for you guys. Trying to decide if the cowl attach strip at the firewall should be permanently attached or removable. I can do it either way. Both have pros and cons.

    Anyone have any opinions or recommendations? IMG_4842.jpg
     
  11. May 27, 2018 at 12:27 AM #11

    cwilliamrose

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    The one that's attached to the firewall? No reason to make it removable that I can think of.
     
  12. May 27, 2018 at 1:18 AM #12

    Timbob

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    Nice looking engine!
     
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  13. May 27, 2018 at 1:44 AM #13

    lanceav8r

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    Yes. The firewall attach.
     
  14. May 27, 2018 at 1:51 AM #14

    cwilliamrose

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    I hope to make my firewall in one piece so it will have a non-removable flange. Christen Eagle firewalls are one piece.
     

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