I'm looking to find the safest way to secure a 4x4 to act as a beam for rope-climbing. In the picture below, the "top" beam sits on-top of two 4x4 posts.
The rope will extend from the far right of the post, putting upward force against whatever join/fastener is selected when someone is climbing it.
Most of the 4x4 fasteners I've seen are designed to secure a post vertically and not against the direction of force being applied here.
This can take a load of 1,950/1.6=1,289 pounds. Just make sure the cantilever length doesn't exceed it's back span. Make sure there's 2 installed on each post to beam connection.
For the horizontal force, install (1) Simpson A21 on the underside of the beam to the side of the post on the left and (2) Simpson A21 from the underside of the beam to the faces of the post on the right. Use (2) 0.148 x 1 1/2 nails for each of the clip connections.
