Standing Rigging Spec Calculator

Inputs

View results
Overall stay or shroud length between bearing pin centers at the chosen target condition.
ft
Loaded/tensioned measurements subtract elastic stretch from the wire cut length. Slack/shop measurements do not.
Distance consumed by fixed terminal hardware from pin center to the wire cut/end reference.
in
Safe closed turnbuckle length from lower pin center to the wire cut/end reference.
in
Maximum safe open turnbuckle length from lower pin center to the wire cut/end reference with required thread engagement.
in
Percent of safe turnbuckle travel used for the nominal build length.
% open
Linear take-up per threaded end per turn. A 20 TPI thread is 0.050 in per turn per end.
in
Most turnbuckles move two threaded ends when the body turns; some one-sided adjustments move one end.
Minimum breaking strength from the exact wire and terminal manufacturer.
lbf
Target tension used only to estimate elastic stretch allowance.
% MBS
Nominal standing rigging wire diameter.
in
Effective axial modulus for the wire construction. Stainless wire rope is commonly below solid-bar stiffness.
Mpsi
Approximate fraction of solid round area occupied by metal in the strand construction.

Results

Default result
Edit inputs
Cut wire length(L_cut)
28.3374ft
Pass

loaded pin-to-pin basis minus elastic stretch allowance

Also computed

Wire span at target(L_wire)28.3583ft

pin-to-pin length minus fixed terminal and turnbuckle setup length

Estimated slack pin-to-pin(L_slack)29.979ft

cut wire plus hardware at the chosen setup position

Turnbuckle setup length(L_setup)Pass14.7in

45% of safe travel from closed

Shorter take-up availablePass2.7in

travel remaining before the turnbuckle reaches the safe closed length

Longer adjustment availablePass3.3in

travel remaining before the turnbuckle reaches the safe open length

Turns to closed27turns

Standing rigging spec previewStanding rigging spec previewPin-to-pin length is split into fixed terminal, cut wire and turnbuckle setup length.cut wire length28.34 ftelastic stretch allowance0.252 inclosedopenScreen only. Hardware lengths, swage/mechanical-terminal allowances, thread engagement, toggles, chainplates and final rig tune require qualified rigging review.
Method notes 4 notes
  • Turnbuckle setup length = closed length + safe travel * setup percent / 100.
  • Wire span at target = pin-to-pin length - fixed terminal allowance - turnbuckle setup length.
  • If the entered pin-to-pin length is loaded/tensioned, cut wire length subtracts the estimated elastic stretch. If it is a slack/shop length, no stretch is subtracted.
  • Standing rigging is safety-critical. Final replacement specs require exact fitting drawings or direct hardware measurements, terminal manufacturer allowances, thread engagement, toggles, chainplate condition, corrosion/fatigue inspection and qualified rigging review.

Powered by MachineCalcs ↗