Likes Likes:  0
Results 1 to 11 of 11

Thread: Piston spring for seaplane door

  1. #1

    Join Date
    Feb 2017
    Posts
    2
    Post Thanks / Like

    Piston spring for seaplane door

    Hi all,

    I have a PA-12 with a seaplane door and want to put a piston spring on the door. Iím tired of getting bonked on the head when I inadvertently release the latch that is currently installed.

    Anybody done this? Any advice on piston selection?

    Thanks,
    Pete

  2. #2
    stewartb's Avatar
    Join Date
    Oct 2012
    Location
    Wolf Lake, AK
    Posts
    6,574
    Post Thanks / Like

  3. #3
    cubdriver2's Avatar
    Join Date
    Apr 2003
    Location
    upstate NY
    Posts
    10,869
    Post Thanks / Like
    You just want it to stay up on the ground or do you want to fly with it open? Most don't stay open all the way in flight, added a latch to hold mine fully open in flight

    Glenn
    "Optimism is going after Moby Dick in a rowboat and taking the tartar sauce with you!"

  4. #4
    skukum12's Avatar
    Join Date
    Feb 2004
    Location
    The Last Frontier
    Posts
    1,243
    Post Thanks / Like
    HaHa, I suppose bonking the head qualifies for medical matters.
    "Always looking up"

  5. #5
    KJC's Avatar
    Join Date
    Jul 2007
    Location
    Clear Lake, MN
    Posts
    300
    Post Thanks / Like
    This is the rod you need. Note the part number. Order the ball sockets with the rod. You need to fabricate the brackets out of stainless. Make sure you install the gas piston at the top. It easily keeps the door open in flight or on the ground. Be sure to space it so the gas piston fully extends and don’t allow the door handle to contact the bottom of the wing. TIG the lower bracket neatly to the door frame so you don’t have to drill holes in tubes.


    Click image for larger version. 

Name:	5C5B7B56-DD7F-47C8-98C1-8E2BFC365B77.jpeg 
Views:	70 
Size:	124.2 KB 
ID:	56588Click image for larger version. 

Name:	8106243A-DE58-442A-84C7-AD7FECC91536.jpg 
Views:	80 
Size:	99.2 KB 
ID:	56589
    Last edited by KJC; 07-04-2021 at 07:06 AM.
    PA-12 N418BS
    Thanks Brandsman thanked for this post

  6. #6
    cubdriver2's Avatar
    Join Date
    Apr 2003
    Location
    upstate NY
    Posts
    10,869
    Post Thanks / Like
    Quote Originally Posted by KJC View Post
    This is the rod you need. Note the part number. Order the ball sockets with the rod. You need to fabricate the brackets out of stainless. Make sure you install the gas piston at the top. It easily keeps the door open in flight or on the ground. Be sure to space it so the gas piston fully extends and don’t allow the door handle to contact the bottom of the wing. TIG the lower bracket neatly to the door frame so you don’t have to drill holes in tubes.


    Click image for larger version. 

Name:	5C5B7B56-DD7F-47C8-98C1-8E2BFC365B77.jpeg 
Views:	70 
Size:	124.2 KB 
ID:	56588Click image for larger version. 

Name:	8106243A-DE58-442A-84C7-AD7FECC91536.jpg 
Views:	80 
Size:	99.2 KB 
ID:	56589
    My doors are a lot lighter then yours, 1/2x1/2" x .029 wall tube. I tried a heavier strut but my door would have folded in half when trying to close it. Good luck in your search

    Glenn
    "Optimism is going after Moby Dick in a rowboat and taking the tartar sauce with you!"

  7. #7
    KJC's Avatar
    Join Date
    Jul 2007
    Location
    Clear Lake, MN
    Posts
    300
    Post Thanks / Like
    I have no idea what you mean. The above photos are of a stock door with a Lexan cover. That gas piston works perfectly.
    PA-12 N418BS

  8. #8
    WindOnHisNose's Avatar
    Join Date
    Apr 2003
    Location
    Lino Lakes MN (MY18)
    Posts
    4,585
    Post Thanks / Like
    Quote Originally Posted by skukum12 View Post
    HaHa, I suppose bonking the head qualifies for medical matters.
    Having bonked my head on the door (and about each and every part of the wing) this thread may belong in Medical Matters. Pete texted me and asked me to move this thread, so it is now moved.

    Hope your 4th was a great one. Always nice to celebrate the Birth of our Nation!

    Randy

  9. #9

    Join Date
    Feb 2017
    Posts
    2
    Post Thanks / Like
    Thanks guys.
    Thanks for the great details, KJC. Where did you get that piston and ball joints?
    Here’s to minimizing the head bonking…!
    Pete

  10. #10
    stewartb's Avatar
    Join Date
    Oct 2012
    Location
    Wolf Lake, AK
    Posts
    6,574
    Post Thanks / Like
    My Cub uses gas springs and this time I used Guden. Stainless isn’t important unless you like the look. Mine are all black nitrided and they work great. All gas springs I’ve used had to be ordered with the proper ends. There’s a link for connector options on the website. https://www.guden.com/itemDisplay/st...al-gas-springs

    Here’s the current link for SPD gas springs, now know as AS Raymond. https://www.asraymond.com/struts.html
    Last edited by stewartb; 07-05-2021 at 03:35 PM.
    Thanks mixer thanked for this post

  11. #11

    Join Date
    Jul 2012
    Location
    Montana
    Posts
    503
    Post Thanks / Like
    Here's a couple shots of mine. I had a hard time trying to do the math, so I just went down to the local Carquest and bought one that felt right, as I recall it's a 25 pounder. I welded up the brackets and attached via vise grips to fit. It worked but it felt weak so I put a bracket on the other side, again it worked great until I bought a second identical shock and mounted them both up. The door wouldn't fully close, it was an angle thing I guess. Thus the second 'lightening hole's in the one photo.
    Click image for larger version. 

Name:	20210705_140500.jpg 
Views:	61 
Size:	175.7 KB 
ID:	56606[ATTACH=CONFIG]56607[/ATTACH[Click image for larger version. 

Name:	20210705_140453.jpg 
Views:	38 
Size:	168.7 KB 
ID:	56607Click image for larger version. 

Name:	20210705_140522.jpg 
Views:	57 
Size:	155.0 KB 
ID:	56608Click image for larger version. 

Name:	20210705_140529.jpg 
Views:	55 
Size:	160.8 KB 
ID:	56609
    Last edited by MT12; 07-05-2021 at 08:35 PM.
    Staying alive in an airplane has a lot more to do with mastering ourselves than mastering the aircraft.

Similar Threads

  1. Seaplane Door
    By Supt in forum Modifications
    Replies: 15
    Last Post: 04-23-2017, 02:02 PM
  2. PA-12 Seaplane Door 337's
    By Texas 12 driver in forum Cafe Supercub
    Replies: 7
    Last Post: 04-30-2015, 10:01 PM
  3. Seaplane door for PA-12
    By NunavutPA-12 in forum Super Cub Repair Facilities
    Replies: 8
    Last Post: 10-31-2009, 07:46 PM
  4. seaplane door
    By RedEye in forum Modifications
    Replies: 1
    Last Post: 11-28-2003, 08:58 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
  •