Robbin I have a 23 and the compression post is original. Just wondering what happened to make you turn into a nautical engineer? Lol. Lenny Smith On Apr 19, 2014, at 11:19 AM, Thomas Buzzi <thomaspbuzzi@gmail.com> wrote:
Robbin, I had a civil engineer run some numbers for me on just that issue. What IS the compression load likely on, in my case with an M17, a sailboat with about 200 sq feet of sail up in, say, 25 knots of wind. It came out to about 1000 pounds. I also found out that a 4x4, yellow pine, #1 grade post, eight feet long with no side bracing will handle the compression load of about 6000 pounds. So a shorter post and one with side bracing such as a bulkhead will handle considerably more. Then too if you choose oak, the numbers would go even higher. Fair winds, Tom B
On Sat, Apr 19, 2014 at 10:54 AM, Robbin Roddewig < robbin.roddewig@verizon.net> wrote:
Hi M-list, I am trying to figure out a design for a compression post for my M-23. I have a stainless steel plate being fabricated by emachineshop that will transfer the load from the tabernacle and solid core deck to the three boards that are on the end of my bulkhead in the M-23. I am going to open the floor liner and set the boards on solid hull/keel with a glassed in block of oak at the base. I have some questions. 1.) What is the load from the mast that I need to make sure the compression post will carry? 2.) How to calculate the tensile strength (compression load) limit of the three boards (they will be epoxied together and form a U shape). I am assuming cross sectional area. And I will put in the factor for laminated boards.
Any help would be appreciated!
Thanks Robbin