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Main deck tangent line
What is the "Main Deck Tangent Line"? I see this on a drawing for SSBN642. How do I use this to develop the cross sections?
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If I remember correctly the tangent-line of the hull is the center line or reference-line from the keel up thru decks.
You need a cross-sectional drawing, to get hull contour shapes.Last edited by toppack; 03-01-2009, 03:23 PM.Rick L.
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Main deck tangent line
Thanks, but unfortunately all I have from the NAVSEA TAB is the Exterior Installations FWD and AFT which when taped together give me a main deck arrangement and profile. From these two drawings I was hoping to develop several cross sections. The more I look at the problem the more I'm thinking it may be more difficult than I thought.Comment
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Listen, the only thing you need sections on are the missile deck (superstructure), sail, control surfaces and horizontal stabilizers. The hull is a tapered cylinder -- plan and profile establish that.
The plan and profile of your drawings indicate the root and tip profile (section) of the control surfaces and horizontal stabilizers, and those surfaces are all of constant tapper, so you have enough in the plans to form those. Same with the sail (plan view indicates root and top of sail section). So, the sail can be built with those drawings.
That leaves only one unknown for you: the sections of the missile deck. However, you know its profile and you know the transverse distances at specific frame locations from the plan - where the missile deck intersects the hull. So, the only measurement you need is the width of the missile deck itself. Work that out and tapper it at the turtleback and bow and you have the selected sections for and aft of the 16 missile tube clam-shell doors.
David,Who is John Galt?Comment
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Thanks, I'll give it a try.Comment
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One more question. Is the width of the missile deck the distance between the port and stbd main deck tangent lines?Comment
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No, Will was my nickname at the academy. I've been researching this boat for years to build a display model for my office at home. One day I'll get there.Comment
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Here is a scan of the page showing the Main Dk Tangent lline. I thought about buying a kit but of doing a scratch build would give me more satisfaction.Attached FilesComment
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Yes, that illustration clarifies: that line on the plan view denotes the transition between the flat deck and beginning of the radius that transitions into the sloping flat sides of the missile deck and terminus at the forward and after ends of the missile deck.
The radius of the curves remains the unknown here. Study your photos and I think you'll be damn close. You now have enough dope to begin construction. Good luck with it.
David,Who is John Galt?Comment
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Thanks David, that's what I wanted to confirm. As always, I appreciate your help.:)Comment
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