Training and safety factors

The fastest way to build rigging intuition is to guess the number before you compute it. The Training tab generates scenarios, scores your estimate and then shows the full working. The Safety factors tab explains the rating a real answer has to fit inside.

Run the quiz

1. Open Training and choose a topic: Everything mixed, Beams & trusses or Bridles.
2. Press New question. You get either a numeric question (What load does Support B carry?, Each leg of a symmetric 45° bridle under 400 kg carries…?) or a judgement question with choices (skew, or stability when a load sits beyond a hoist).
3. Type Your estimate in the current unit, or pick an answer, and press Check answer. A numeric answer counts as correct within a tolerance. A guess that comes in low — the unsafe side — gets less room than one that comes in high, and the result says which side you were on.
4. Read the explanation — the lever rule, the centroid, superposition, self-weight, the bridle ladder, skew or stability — then Next question.
5. Open in sandbox loads the question's exact setup into the Sandbox or Bridles tab so you can drag it and see. After a wrong answer, Refresh the basics opens the glossary entry for that topic.

The quiz also works on a phone.

Levels, streaks and badges

• Nine levels. Level up and the questions get tougher and the tolerance tighter (Level up! Welcome to level n).
• Badges at level 3 (Solid basics), 6 (Working pro) and 9 (Rigging brain).
• Streak, Best and Accuracy are tracked, with badges for 5, 10 and 25 correct in a row.
• Progress syncs with your account, so a streak survives a device switch.

Safety factors: WLL = MBS ÷ SF

The Safety factors tab shows the relationship every "5:1" conversation is really about:

• Pick a Hardware preset — 1 t chain hoist (D8), 1 t chain hoist (D8+), steel wire rope sling, 3.25 t bow shackle, half-coupler truss clamp — and move the Safety factor slider. Breaking strength (MBS) and Working Load Limit update. The presets are example values, not manufacturer data.
• The hoist-classes card explains the classes of IGVW SQ P2: D8 (chain factor typically 5; no loads over people without a secondary rated for twice the load), D8+ (the whole load path sized for twice the rated load — chain at least 8 at rest — plus a second brake; may hold loads over people while stopped) and C1 (the D8+ margins plus an overload cut-off and double limit switches; may move loads over people, DIN EN 17206). Datasheets often say “10” for D8+: that is a D8 run at half its rating, the usual way to build one.
• The dynamic-loading card explains why a snubbed stop or a bouncing lift is what part of the safety factor is for — not spare capacity to use up. As a rule of thumb, German practice adds at least 20 % for moving loads (DGUV Information 215-313); manufacturers may ask for more.

Comparing with the example WLL

The Safety factors tab reads the live highest hoist load from your current sandbox scenario and says whether it sits below the example WLL, close to it (80 % or more) or above it. The sandbox shows the same comparison under its reactions, and a red support marks a hoist whose load is above the example WLL. Change the hardware on the Safety factors tab and the sandbox follows. It is a teaching comparison with example values — it does not rate your rig.

Saved scenarios

The Saved tab lists every scenario you saved from the Sandbox or Bridles tab. Open loads it into its tab, where Copy link and Print work as usual; Delete removes it. Scenarios sync with your account; a shared link contains the whole setup, so a colleague sees your exact scenario even if they have to sign in first.