Thanks Thanks:  0
Likes Likes:  0
Results 1 to 9 of 9

Thread: PA11 Boot Cowl fabrication

  1. #1

    Join Date
    Feb 2010
    Location
    Massachusetts
    Posts
    23
    Post Thanks / Like

    PA11 Boot Cowl fabrication

    I need to build a new boot cowl for a PA11 / PA18-95. I would like to discuss this with some of you who have had success (or failure) with this project. I have looked at using an Atlee or Clive Smith firewall with the flange attached and fabricating the bootcowl skin from flat stock or using the Univair premade skins with the flange and a flat firewall. Any experienced comments would be appreciated.
    Thank you, Harry

  2. #2
    Steve Pierce's Avatar
    Join Date
    Mar 2002
    Location
    Graham, TX
    Posts
    20,724
    Post Thanks / Like
    Clyde makes a stainless steel firewall and flange. I use his flange and titanium for the firewall itself. I fabricate the bootcowl out of 2024-T3 instead of the 3003 aluminum that Piper and Univair use. It is very soft and dents very easy but makes making the folded flange much easier. I duplicate the old boot cowl and flush rivet the reinforcing angles per the original. On a Super Cub I usually use 3 or 4 pieces and nut plates so I can get to the back of the instrument panel. Not really needed on a PA11/PA18-95 in my opinion. I do put nut plates in the 3/8" Piper channel and the bottom of the boot cowl to gain access under the floorboards.
    Steve Pierce

    Everybody is ignorant, only on different subjects.
    Will Rogers

  3. #3
    skysigns's Avatar
    Join Date
    Jul 2002
    Location
    seattle wa 98053
    Posts
    357
    Post Thanks / Like
    steve would you have a pic of yours i need to make a new one
    cheers jc

  4. #4
    mike mcs repair's Avatar
    Join Date
    Aug 2004
    Location
    chugiak AK
    Posts
    11,773
    Post Thanks / Like
    pictures of making some in my picasa link below... pa-12 i think maybe others

  5. #5

    Join Date
    Jul 2012
    Location
    Montana
    Posts
    476
    Post Thanks / Like
    I've used 2 firewalls made by Clyde Smith on pa-12's, both worked and fit great. In the case of the 12 you have to shorten the 4 channels that hold on the nose bowl/cowl and top cowl on because he puts the angle bracket on different than piper did (facing forward instead of aft) , but that's no big deal and like I said they work great.

    doug
    Last edited by MT12; 07-02-2016 at 06:38 PM. Reason: bad spelin'

  6. #6

    Join Date
    Jun 2008
    Location
    Ferndale wa
    Posts
    7
    Post Thanks / Like
    We did that using Clydes firewall with the flange.

  7. #7
    Steve Pierce's Avatar
    Join Date
    Mar 2002
    Location
    Graham, TX
    Posts
    20,724
    Post Thanks / Like
    Google search boot cowl on this site:

    https://www.google.com/url?sa=t&sour...Iwucwt3FPPx_wg

    https://www.google.com/url?sa=t&sour...vOAaCvH5lGgPtQ

    https://www.google.com/url?sa=t&sour...7H4qs9cALnHsoQ

    Here is a photo album with pictures of modifying a Univair boot cowl to fit.
    https://picasaweb.google.com/1147188...t=embedwebsite

    And this one has pictures of a 4 piee boot cowl. I know make them in 3 pieces, top and two sides.
    https://picasaweb.google.com/1147188...t=embedwebsite
    Steve Pierce

    Everybody is ignorant, only on different subjects.
    Will Rogers

  8. #8

    Join Date
    Feb 2010
    Location
    Massachusetts
    Posts
    23
    Post Thanks / Like
    Thanks for the replies, I checked out all the links and a 3 piece boot cowl it will be. I have 2 questions, most of you are using screws and nut plates where the boot cowl skin attaches to the firewall, what size screws are you using, 8's or 10's? Most of the screws I saw seem to be truss head, is there any chaffing concerns when the engine cowl skins overlap this line of screws? Thanks.

  9. #9
    Steve Pierce's Avatar
    Join Date
    Mar 2002
    Location
    Graham, TX
    Posts
    20,724
    Post Thanks / Like
    #6 screws. I dimple the screws where the top cowl fits.
    Steve Pierce

    Everybody is ignorant, only on different subjects.
    Will Rogers

Similar Threads

  1. J-3 boot cowl and engine cowl on a PA-18
    By j3flyer in forum Experimental Cubs
    Replies: 6
    Last Post: 12-08-2015, 10:55 AM
  2. Metal for boot cowl and engine cowl
    By Jim Miller in forum Experimental Cubs
    Replies: 22
    Last Post: 05-13-2015, 10:30 AM
  3. Webbing on nose cowl & boot cowl
    By cubnut93 in forum Tips and Tricks
    Replies: 14
    Last Post: 05-24-2014, 10:04 PM
  4. Boot Cowl Fabrication Photo's
    By Beach Bum in forum Cafe Supercub
    Replies: 3
    Last Post: 08-09-2011, 10:33 PM

Bookmarks

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •