redbopeep
09-01-2007, 02:02 AM
Ok, I'm a'staring at the beams that will need replacing (rotted) and wondering about what I see.
The boat is 54' on deck so there's plenty of deck beams to stare at. Now, from the stem back to frame 17 there's the foredeck, then at 17 on back we have a flush deck (raised deck). What I'm wondering about is how the deck beams are "supposed to be set" on the shear clamp. Looking at the plans of this boat I see that the deck beams are drawn parallel to the frames, in other words, they're "vertical" and don't follow the shear. However, what's the "as built" state is that the deck beams are vertical from about frame 14 on back but they're set at a slight angle averaging about halfway between parallel to the frames and perpendicular to the shear clamp from frame 13 forward. This includes the deck beams around the foremast (schooner rig) which have some lovely blocking between the deck beams that I wish to retain and reuse.
It seems a bit interesting that they're set this way. The shear line (and thus shear clamp, too) is noticeably coming up from about frame 15 forward. Frame 13 deck beam "starts" being a little bit off of vertical and has a small cut in so that it rests properly on top the shear clamp. By the time we get to frame 9, its a bigger cut (the shear is rising faster) to make it fit properly at an angle and it seems to have made it to that "halfway between parallel to the frames and perpendicular to the shear clamp" position. By frame 6, the deck beams are really quite "canted" but still have a cut into the shear clamp because they're not quite as "canted" as they'd be if purely perpendicular to the shear clamp.
I hope you can understand this.
So, what's "normal" in the world of Crocker schooners? Or boats of the 1920's-1940 era? We're tending towards just going with what's there already but wonder if what's "right". I see no mention of this is Steward or any other reference books I own.
As always, I appreciate your input!
The boat is 54' on deck so there's plenty of deck beams to stare at. Now, from the stem back to frame 17 there's the foredeck, then at 17 on back we have a flush deck (raised deck). What I'm wondering about is how the deck beams are "supposed to be set" on the shear clamp. Looking at the plans of this boat I see that the deck beams are drawn parallel to the frames, in other words, they're "vertical" and don't follow the shear. However, what's the "as built" state is that the deck beams are vertical from about frame 14 on back but they're set at a slight angle averaging about halfway between parallel to the frames and perpendicular to the shear clamp from frame 13 forward. This includes the deck beams around the foremast (schooner rig) which have some lovely blocking between the deck beams that I wish to retain and reuse.
It seems a bit interesting that they're set this way. The shear line (and thus shear clamp, too) is noticeably coming up from about frame 15 forward. Frame 13 deck beam "starts" being a little bit off of vertical and has a small cut in so that it rests properly on top the shear clamp. By the time we get to frame 9, its a bigger cut (the shear is rising faster) to make it fit properly at an angle and it seems to have made it to that "halfway between parallel to the frames and perpendicular to the shear clamp" position. By frame 6, the deck beams are really quite "canted" but still have a cut into the shear clamp because they're not quite as "canted" as they'd be if purely perpendicular to the shear clamp.
I hope you can understand this.
So, what's "normal" in the world of Crocker schooners? Or boats of the 1920's-1940 era? We're tending towards just going with what's there already but wonder if what's "right". I see no mention of this is Steward or any other reference books I own.
As always, I appreciate your input!